Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull compat iovec cleanups from Al Viro:
"Christoph's series around import_iovec() and compat variant thereof"
* 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
security/keys: remove compat_keyctl_instantiate_key_iov
mm: remove compat_process_vm_{readv,writev}
fs: remove compat_sys_vmsplice
fs: remove the compat readv/writev syscalls
fs: remove various compat readv/writev helpers
iov_iter: transparently handle compat iovecs in import_iovec
iov_iter: refactor rw_copy_check_uvector and import_iovec
iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c
compat.h: fix a spelling error in <linux/compat.h>
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 734860a..0c280a0 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -301,9 +301,9 @@
#define __NR_msync 144
__SYSCALL(__NR_msync, sys_msync)
#define __NR_readv 145
-__SYSCALL(__NR_readv, compat_sys_readv)
+__SYSCALL(__NR_readv, sys_readv)
#define __NR_writev 146
-__SYSCALL(__NR_writev, compat_sys_writev)
+__SYSCALL(__NR_writev, sys_writev)
#define __NR_getsid 147
__SYSCALL(__NR_getsid, sys_getsid)
#define __NR_fdatasync 148
@@ -697,7 +697,7 @@
#define __NR_tee 342
__SYSCALL(__NR_tee, sys_tee)
#define __NR_vmsplice 343
-__SYSCALL(__NR_vmsplice, compat_sys_vmsplice)
+__SYSCALL(__NR_vmsplice, sys_vmsplice)
#define __NR_move_pages 344
__SYSCALL(__NR_move_pages, compat_sys_move_pages)
#define __NR_getcpu 345
@@ -763,9 +763,9 @@
#define __NR_setns 375
__SYSCALL(__NR_setns, sys_setns)
#define __NR_process_vm_readv 376
-__SYSCALL(__NR_process_vm_readv, compat_sys_process_vm_readv)
+__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv)
#define __NR_process_vm_writev 377
-__SYSCALL(__NR_process_vm_writev, compat_sys_process_vm_writev)
+__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev)
#define __NR_kcmp 378
__SYSCALL(__NR_kcmp, sys_kcmp)
#define __NR_finit_module 379
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index f9df9ed..0bc2e0f 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -25,8 +25,8 @@
15 n32 ioctl compat_sys_ioctl
16 n32 pread64 sys_pread64
17 n32 pwrite64 sys_pwrite64
-18 n32 readv compat_sys_readv
-19 n32 writev compat_sys_writev
+18 n32 readv sys_readv
+19 n32 writev sys_writev
20 n32 access sys_access
21 n32 pipe sysm_pipe
22 n32 _newselect compat_sys_select
@@ -278,7 +278,7 @@
267 n32 splice sys_splice
268 n32 sync_file_range sys_sync_file_range
269 n32 tee sys_tee
-270 n32 vmsplice compat_sys_vmsplice
+270 n32 vmsplice sys_vmsplice
271 n32 move_pages compat_sys_move_pages
272 n32 set_robust_list compat_sys_set_robust_list
273 n32 get_robust_list compat_sys_get_robust_list
@@ -317,8 +317,8 @@
306 n32 syncfs sys_syncfs
307 n32 sendmmsg compat_sys_sendmmsg
308 n32 setns sys_setns
-309 n32 process_vm_readv compat_sys_process_vm_readv
-310 n32 process_vm_writev compat_sys_process_vm_writev
+309 n32 process_vm_readv sys_process_vm_readv
+310 n32 process_vm_writev sys_process_vm_writev
311 n32 kcmp sys_kcmp
312 n32 finit_module sys_finit_module
313 n32 sched_setattr sys_sched_setattr
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 195b43c..b408c13 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -156,8 +156,8 @@
142 o32 _newselect sys_select compat_sys_select
143 o32 flock sys_flock
144 o32 msync sys_msync
-145 o32 readv sys_readv compat_sys_readv
-146 o32 writev sys_writev compat_sys_writev
+145 o32 readv sys_readv
+146 o32 writev sys_writev
147 o32 cacheflush sys_cacheflush
148 o32 cachectl sys_cachectl
149 o32 sysmips __sys_sysmips
@@ -318,7 +318,7 @@
304 o32 splice sys_splice
305 o32 sync_file_range sys_sync_file_range sys32_sync_file_range
306 o32 tee sys_tee
-307 o32 vmsplice sys_vmsplice compat_sys_vmsplice
+307 o32 vmsplice sys_vmsplice
308 o32 move_pages sys_move_pages compat_sys_move_pages
309 o32 set_robust_list sys_set_robust_list compat_sys_set_robust_list
310 o32 get_robust_list sys_get_robust_list compat_sys_get_robust_list
@@ -356,8 +356,8 @@
342 o32 syncfs sys_syncfs
343 o32 sendmmsg sys_sendmmsg compat_sys_sendmmsg
344 o32 setns sys_setns
-345 o32 process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-346 o32 process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+345 o32 process_vm_readv sys_process_vm_readv
+346 o32 process_vm_writev sys_process_vm_writev
347 o32 kcmp sys_kcmp
348 o32 finit_module sys_finit_module
349 o32 sched_setattr sys_sched_setattr
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index def64d2..2015a51 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -159,8 +159,8 @@
142 common _newselect sys_select compat_sys_select
143 common flock sys_flock
144 common msync sys_msync
-145 common readv sys_readv compat_sys_readv
-146 common writev sys_writev compat_sys_writev
+145 common readv sys_readv
+146 common writev sys_writev
147 common getsid sys_getsid
148 common fdatasync sys_fdatasync
149 common _sysctl sys_ni_syscall
@@ -330,7 +330,7 @@
292 32 sync_file_range parisc_sync_file_range
292 64 sync_file_range sys_sync_file_range
293 common tee sys_tee
-294 common vmsplice sys_vmsplice compat_sys_vmsplice
+294 common vmsplice sys_vmsplice
295 common move_pages sys_move_pages compat_sys_move_pages
296 common getcpu sys_getcpu
297 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait
@@ -372,8 +372,8 @@
327 common syncfs sys_syncfs
328 common setns sys_setns
329 common sendmmsg sys_sendmmsg compat_sys_sendmmsg
-330 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-331 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+330 common process_vm_readv sys_process_vm_readv
+331 common process_vm_writev sys_process_vm_writev
332 common kcmp sys_kcmp
333 common finit_module sys_finit_module
334 common sched_setattr sys_sched_setattr
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index c2d737f..66a472a 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -193,8 +193,8 @@
142 common _newselect sys_select compat_sys_select
143 common flock sys_flock
144 common msync sys_msync
-145 common readv sys_readv compat_sys_readv
-146 common writev sys_writev compat_sys_writev
+145 common readv sys_readv
+146 common writev sys_writev
147 common getsid sys_getsid
148 common fdatasync sys_fdatasync
149 nospu _sysctl sys_ni_syscall
@@ -369,7 +369,7 @@
282 common unshare sys_unshare
283 common splice sys_splice
284 common tee sys_tee
-285 common vmsplice sys_vmsplice compat_sys_vmsplice
+285 common vmsplice sys_vmsplice
286 common openat sys_openat compat_sys_openat
287 common mkdirat sys_mkdirat
288 common mknodat sys_mknodat
@@ -449,8 +449,8 @@
348 common syncfs sys_syncfs
349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg
350 common setns sys_setns
-351 nospu process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-352 nospu process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+351 nospu process_vm_readv sys_process_vm_readv
+352 nospu process_vm_writev sys_process_vm_writev
353 nospu finit_module sys_finit_module
354 nospu kcmp sys_kcmp
355 common sched_setattr sys_sched_setattr
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 10456bc..7485867 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -134,8 +134,8 @@
142 64 select sys_select -
143 common flock sys_flock sys_flock
144 common msync sys_msync sys_msync
-145 common readv sys_readv compat_sys_readv
-146 common writev sys_writev compat_sys_writev
+145 common readv sys_readv sys_readv
+146 common writev sys_writev sys_writev
147 common getsid sys_getsid sys_getsid
148 common fdatasync sys_fdatasync sys_fdatasync
149 common _sysctl - -
@@ -316,7 +316,7 @@
306 common splice sys_splice sys_splice
307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range
308 common tee sys_tee sys_tee
-309 common vmsplice sys_vmsplice compat_sys_vmsplice
+309 common vmsplice sys_vmsplice sys_vmsplice
310 common move_pages sys_move_pages compat_sys_move_pages
311 common getcpu sys_getcpu sys_getcpu
312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait
@@ -347,8 +347,8 @@
337 common clock_adjtime sys_clock_adjtime sys_clock_adjtime32
338 common syncfs sys_syncfs sys_syncfs
339 common setns sys_setns sys_setns
-340 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-341 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+340 common process_vm_readv sys_process_vm_readv sys_process_vm_readv
+341 common process_vm_writev sys_process_vm_writev sys_process_vm_writev
342 common s390_runtime_instr sys_s390_runtime_instr sys_s390_runtime_instr
343 common kcmp sys_kcmp sys_kcmp
344 common finit_module sys_finit_module sys_finit_module
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 4af114e..4a9365b 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -38,7 +38,7 @@
23 64 setuid sys_setuid
24 32 getuid sys_getuid16
24 64 getuid sys_getuid
-25 common vmsplice sys_vmsplice compat_sys_vmsplice
+25 common vmsplice sys_vmsplice
26 common ptrace sys_ptrace compat_sys_ptrace
27 common alarm sys_alarm
28 common sigaltstack sys_sigaltstack compat_sys_sigaltstack
@@ -149,8 +149,8 @@
117 common getrusage sys_getrusage compat_sys_getrusage
118 common getsockopt sys_getsockopt sys_getsockopt
119 common getcwd sys_getcwd
-120 common readv sys_readv compat_sys_readv
-121 common writev sys_writev compat_sys_writev
+120 common readv sys_readv
+121 common writev sys_writev
122 common settimeofday sys_settimeofday compat_sys_settimeofday
123 32 fchown sys_fchown16
123 64 fchown sys_fchown
@@ -406,8 +406,8 @@
335 common syncfs sys_syncfs
336 common sendmmsg sys_sendmmsg compat_sys_sendmmsg
337 common setns sys_setns
-338 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-339 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+338 common process_vm_readv sys_process_vm_readv
+339 common process_vm_writev sys_process_vm_writev
340 32 kern_features sys_ni_syscall sys_kern_features
340 64 kern_features sys_kern_features
341 common kcmp sys_kcmp
diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c
index 1583831..f2fe0a3 100644
--- a/arch/x86/entry/syscall_x32.c
+++ b/arch/x86/entry/syscall_x32.c
@@ -12,8 +12,13 @@
* Reuse the 64-bit entry points for the x32 versions that occupy different
* slots in the syscall table.
*/
+#define __x32_sys_readv __x64_sys_readv
+#define __x32_sys_writev __x64_sys_writev
#define __x32_sys_getsockopt __x64_sys_getsockopt
#define __x32_sys_setsockopt __x64_sys_setsockopt
+#define __x32_sys_vmsplice __x64_sys_vmsplice
+#define __x32_sys_process_vm_readv __x64_sys_process_vm_readv
+#define __x32_sys_process_vm_writev __x64_sys_process_vm_writev
#define __SYSCALL_64(nr, sym)
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 9d11028..5fbe10a 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -156,8 +156,8 @@
142 i386 _newselect sys_select compat_sys_select
143 i386 flock sys_flock
144 i386 msync sys_msync
-145 i386 readv sys_readv compat_sys_readv
-146 i386 writev sys_writev compat_sys_writev
+145 i386 readv sys_readv
+146 i386 writev sys_writev
147 i386 getsid sys_getsid
148 i386 fdatasync sys_fdatasync
149 i386 _sysctl sys_ni_syscall
@@ -327,7 +327,7 @@
313 i386 splice sys_splice
314 i386 sync_file_range sys_ia32_sync_file_range
315 i386 tee sys_tee
-316 i386 vmsplice sys_vmsplice compat_sys_vmsplice
+316 i386 vmsplice sys_vmsplice
317 i386 move_pages sys_move_pages compat_sys_move_pages
318 i386 getcpu sys_getcpu
319 i386 epoll_pwait sys_epoll_pwait
@@ -358,8 +358,8 @@
344 i386 syncfs sys_syncfs
345 i386 sendmmsg sys_sendmmsg compat_sys_sendmmsg
346 i386 setns sys_setns
-347 i386 process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-348 i386 process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+347 i386 process_vm_readv sys_process_vm_readv
+348 i386 process_vm_writev sys_process_vm_writev
349 i386 kcmp sys_kcmp
350 i386 finit_module sys_finit_module
351 i386 sched_setattr sys_sched_setattr
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index f30d6ae..3478096 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -371,8 +371,8 @@
512 x32 rt_sigaction compat_sys_rt_sigaction
513 x32 rt_sigreturn compat_sys_x32_rt_sigreturn
514 x32 ioctl compat_sys_ioctl
-515 x32 readv compat_sys_readv
-516 x32 writev compat_sys_writev
+515 x32 readv sys_readv
+516 x32 writev sys_writev
517 x32 recvfrom compat_sys_recvfrom
518 x32 sendmsg compat_sys_sendmsg
519 x32 recvmsg compat_sys_recvmsg
@@ -388,15 +388,15 @@
529 x32 waitid compat_sys_waitid
530 x32 set_robust_list compat_sys_set_robust_list
531 x32 get_robust_list compat_sys_get_robust_list
-532 x32 vmsplice compat_sys_vmsplice
+532 x32 vmsplice sys_vmsplice
533 x32 move_pages compat_sys_move_pages
534 x32 preadv compat_sys_preadv64
535 x32 pwritev compat_sys_pwritev64
536 x32 rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo
537 x32 recvmmsg compat_sys_recvmmsg_time64
538 x32 sendmmsg compat_sys_sendmmsg
-539 x32 process_vm_readv compat_sys_process_vm_readv
-540 x32 process_vm_writev compat_sys_process_vm_writev
+539 x32 process_vm_readv sys_process_vm_readv
+540 x32 process_vm_writev sys_process_vm_writev
541 x32 setsockopt sys_setsockopt
542 x32 getsockopt sys_getsockopt
543 x32 io_setup compat_sys_io_setup
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 7210840..97e0b16 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -333,16 +333,8 @@
struct iov_iter i;
struct iovec *iov = NULL;
-#ifdef CONFIG_COMPAT
- if (in_compat_syscall())
- ret = compat_import_iovec(rq_data_dir(rq),
- hdr->dxferp, hdr->iovec_count,
- 0, &iov, &i);
- else
-#endif
- ret = import_iovec(rq_data_dir(rq),
- hdr->dxferp, hdr->iovec_count,
- 0, &iov, &i);
+ ret = import_iovec(rq_data_dir(rq), hdr->dxferp,
+ hdr->iovec_count, 0, &iov, &i);
if (ret < 0)
goto out_free_cdb;
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 20472aaa..bfa8d77 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1820,14 +1820,7 @@
struct iovec *iov = NULL;
struct iov_iter i;
-#ifdef CONFIG_COMPAT
- if (in_compat_syscall())
- res = compat_import_iovec(rw, hp->dxferp, iov_count,
- 0, &iov, &i);
- else
-#endif
- res = import_iovec(rw, hp->dxferp, iov_count,
- 0, &iov, &i);
+ res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
if (res < 0)
return res;
diff --git a/fs/aio.c b/fs/aio.c
index d5ec303..c45c20d 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1489,12 +1489,8 @@
*iovec = NULL;
return ret;
}
-#ifdef CONFIG_COMPAT
- if (compat)
- return compat_import_iovec(rw, buf, len, UIO_FASTIOV, iovec,
- iter);
-#endif
- return import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter);
+
+ return __import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter, compat);
}
static inline void aio_rw_done(struct kiocb *req, ssize_t ret)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index aae0ef2..f58b3d6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2852,13 +2852,8 @@
return ret;
}
-#ifdef CONFIG_COMPAT
- if (req->ctx->compat)
- return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV,
- iovec, iter);
-#endif
-
- return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter);
+ return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter,
+ req->ctx->compat);
}
static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
@@ -4200,8 +4195,9 @@
sr->len);
iomsg->iov = NULL;
} else {
- ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
- &iomsg->iov, &iomsg->msg.msg_iter);
+ ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
+ &iomsg->iov, &iomsg->msg.msg_iter,
+ false);
if (ret > 0)
ret = 0;
}
@@ -4241,9 +4237,9 @@
sr->len = iomsg->iov[0].iov_len;
iomsg->iov = NULL;
} else {
- ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV,
- &iomsg->iov,
- &iomsg->msg.msg_iter);
+ ret = __import_iovec(READ, (struct iovec __user *)uiov, len,
+ UIO_FASTIOV, &iomsg->iov,
+ &iomsg->msg.msg_iter, true);
if (ret < 0)
return ret;
}
diff --git a/fs/read_write.c b/fs/read_write.c
index d342818..19f5c4b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -760,185 +760,6 @@
return ret;
}
-/**
- * rw_copy_check_uvector() - Copy an array of &struct iovec from userspace
- * into the kernel and check that it is valid.
- *
- * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE.
- * @uvector: Pointer to the userspace array.
- * @nr_segs: Number of elements in userspace array.
- * @fast_segs: Number of elements in @fast_pointer.
- * @fast_pointer: Pointer to (usually small on-stack) kernel array.
- * @ret_pointer: (output parameter) Pointer to a variable that will point to
- * either @fast_pointer, a newly allocated kernel array, or NULL,
- * depending on which array was used.
- *
- * This function copies an array of &struct iovec of @nr_segs from
- * userspace into the kernel and checks that each element is valid (e.g.
- * it does not point to a kernel address or cause overflow by being too
- * large, etc.).
- *
- * As an optimization, the caller may provide a pointer to a small
- * on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long
- * (the size of this array, or 0 if unused, should be given in @fast_segs).
- *
- * @ret_pointer will always point to the array that was used, so the
- * caller must take care not to call kfree() on it e.g. in case the
- * @fast_pointer array was used and it was allocated on the stack.
- *
- * Return: The total number of bytes covered by the iovec array on success
- * or a negative error code on error.
- */
-ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
- unsigned long nr_segs, unsigned long fast_segs,
- struct iovec *fast_pointer,
- struct iovec **ret_pointer)
-{
- unsigned long seg;
- ssize_t ret;
- struct iovec *iov = fast_pointer;
-
- /*
- * SuS says "The readv() function *may* fail if the iovcnt argument
- * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
- * traditionally returned zero for zero segments, so...
- */
- if (nr_segs == 0) {
- ret = 0;
- goto out;
- }
-
- /*
- * First get the "struct iovec" from user memory and
- * verify all the pointers
- */
- if (nr_segs > UIO_MAXIOV) {
- ret = -EINVAL;
- goto out;
- }
- if (nr_segs > fast_segs) {
- iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL);
- if (iov == NULL) {
- ret = -ENOMEM;
- goto out;
- }
- }
- if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
- ret = -EFAULT;
- goto out;
- }
-
- /*
- * According to the Single Unix Specification we should return EINVAL
- * if an element length is < 0 when cast to ssize_t or if the
- * total length would overflow the ssize_t return value of the
- * system call.
- *
- * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
- * overflow case.
- */
- ret = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- void __user *buf = iov[seg].iov_base;
- ssize_t len = (ssize_t)iov[seg].iov_len;
-
- /* see if we we're about to use an invalid len or if
- * it's about to overflow ssize_t */
- if (len < 0) {
- ret = -EINVAL;
- goto out;
- }
- if (type >= 0
- && unlikely(!access_ok(buf, len))) {
- ret = -EFAULT;
- goto out;
- }
- if (len > MAX_RW_COUNT - ret) {
- len = MAX_RW_COUNT - ret;
- iov[seg].iov_len = len;
- }
- ret += len;
- }
-out:
- *ret_pointer = iov;
- return ret;
-}
-
-#ifdef CONFIG_COMPAT
-ssize_t compat_rw_copy_check_uvector(int type,
- const struct compat_iovec __user *uvector, unsigned long nr_segs,
- unsigned long fast_segs, struct iovec *fast_pointer,
- struct iovec **ret_pointer)
-{
- compat_ssize_t tot_len;
- struct iovec *iov = *ret_pointer = fast_pointer;
- ssize_t ret = 0;
- int seg;
-
- /*
- * SuS says "The readv() function *may* fail if the iovcnt argument
- * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
- * traditionally returned zero for zero segments, so...
- */
- if (nr_segs == 0)
- goto out;
-
- ret = -EINVAL;
- if (nr_segs > UIO_MAXIOV)
- goto out;
- if (nr_segs > fast_segs) {
- ret = -ENOMEM;
- iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL);
- if (iov == NULL)
- goto out;
- }
- *ret_pointer = iov;
-
- ret = -EFAULT;
- if (!access_ok(uvector, nr_segs*sizeof(*uvector)))
- goto out;
-
- /*
- * Single unix specification:
- * We should -EINVAL if an element length is not >= 0 and fitting an
- * ssize_t.
- *
- * In Linux, the total length is limited to MAX_RW_COUNT, there is
- * no overflow possibility.
- */
- tot_len = 0;
- ret = -EINVAL;
- for (seg = 0; seg < nr_segs; seg++) {
- compat_uptr_t buf;
- compat_ssize_t len;
-
- if (__get_user(len, &uvector->iov_len) ||
- __get_user(buf, &uvector->iov_base)) {
- ret = -EFAULT;
- goto out;
- }
- if (len < 0) /* size_t not fitting in compat_ssize_t .. */
- goto out;
- if (type >= 0 &&
- !access_ok(compat_ptr(buf), len)) {
- ret = -EFAULT;
- goto out;
- }
- if (len > MAX_RW_COUNT - tot_len)
- len = MAX_RW_COUNT - tot_len;
- tot_len += len;
- iov->iov_base = compat_ptr(buf);
- iov->iov_len = (compat_size_t) len;
- uvector++;
- iov++;
- }
- ret = tot_len;
-
-out:
- return ret;
-}
-#endif
-
static ssize_t do_iter_read(struct file *file, struct iov_iter *iter,
loff_t *pos, rwf_t flags)
{
@@ -1255,224 +1076,93 @@
return do_pwritev(fd, vec, vlen, pos, flags);
}
+/*
+ * Various compat syscalls. Note that they all pretend to take a native
+ * iovec - import_iovec will properly treat those as compat_iovecs based on
+ * in_compat_syscall().
+ */
#ifdef CONFIG_COMPAT
-static size_t compat_readv(struct file *file,
- const struct compat_iovec __user *vec,
- unsigned long vlen, loff_t *pos, rwf_t flags)
-{
- struct iovec iovstack[UIO_FASTIOV];
- struct iovec *iov = iovstack;
- struct iov_iter iter;
- ssize_t ret;
-
- ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter);
- if (ret >= 0) {
- ret = do_iter_read(file, &iter, pos, flags);
- kfree(iov);
- }
- if (ret > 0)
- add_rchar(current, ret);
- inc_syscr(current);
- return ret;
-}
-
-static size_t do_compat_readv(compat_ulong_t fd,
- const struct compat_iovec __user *vec,
- compat_ulong_t vlen, rwf_t flags)
-{
- struct fd f = fdget_pos(fd);
- ssize_t ret;
- loff_t pos;
-
- if (!f.file)
- return -EBADF;
- pos = f.file->f_pos;
- ret = compat_readv(f.file, vec, vlen, &pos, flags);
- if (ret >= 0)
- f.file->f_pos = pos;
- fdput_pos(f);
- return ret;
-
-}
-
-COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
- const struct compat_iovec __user *,vec,
- compat_ulong_t, vlen)
-{
- return do_compat_readv(fd, vec, vlen, 0);
-}
-
-static long do_compat_preadv64(unsigned long fd,
- const struct compat_iovec __user *vec,
- unsigned long vlen, loff_t pos, rwf_t flags)
-{
- struct fd f;
- ssize_t ret;
-
- if (pos < 0)
- return -EINVAL;
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
- ret = -ESPIPE;
- if (f.file->f_mode & FMODE_PREAD)
- ret = compat_readv(f.file, vec, vlen, &pos, flags);
- fdput(f);
- return ret;
-}
-
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
unsigned long, vlen, loff_t, pos)
{
- return do_compat_preadv64(fd, vec, vlen, pos, 0);
+ return do_preadv(fd, vec, vlen, pos, 0);
}
#endif
COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
- return do_compat_preadv64(fd, vec, vlen, pos, 0);
+ return do_preadv(fd, vec, vlen, pos, 0);
}
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
unsigned long, vlen, loff_t, pos, rwf_t, flags)
{
if (pos == -1)
- return do_compat_readv(fd, vec, vlen, flags);
-
- return do_compat_preadv64(fd, vec, vlen, pos, flags);
+ return do_readv(fd, vec, vlen, flags);
+ return do_preadv(fd, vec, vlen, pos, flags);
}
#endif
COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
compat_ulong_t, vlen, u32, pos_low, u32, pos_high,
rwf_t, flags)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
if (pos == -1)
- return do_compat_readv(fd, vec, vlen, flags);
-
- return do_compat_preadv64(fd, vec, vlen, pos, flags);
-}
-
-static size_t compat_writev(struct file *file,
- const struct compat_iovec __user *vec,
- unsigned long vlen, loff_t *pos, rwf_t flags)
-{
- struct iovec iovstack[UIO_FASTIOV];
- struct iovec *iov = iovstack;
- struct iov_iter iter;
- ssize_t ret;
-
- ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter);
- if (ret >= 0) {
- file_start_write(file);
- ret = do_iter_write(file, &iter, pos, flags);
- file_end_write(file);
- kfree(iov);
- }
- if (ret > 0)
- add_wchar(current, ret);
- inc_syscw(current);
- return ret;
-}
-
-static size_t do_compat_writev(compat_ulong_t fd,
- const struct compat_iovec __user* vec,
- compat_ulong_t vlen, rwf_t flags)
-{
- struct fd f = fdget_pos(fd);
- ssize_t ret;
- loff_t pos;
-
- if (!f.file)
- return -EBADF;
- pos = f.file->f_pos;
- ret = compat_writev(f.file, vec, vlen, &pos, flags);
- if (ret >= 0)
- f.file->f_pos = pos;
- fdput_pos(f);
- return ret;
-}
-
-COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
- const struct compat_iovec __user *, vec,
- compat_ulong_t, vlen)
-{
- return do_compat_writev(fd, vec, vlen, 0);
-}
-
-static long do_compat_pwritev64(unsigned long fd,
- const struct compat_iovec __user *vec,
- unsigned long vlen, loff_t pos, rwf_t flags)
-{
- struct fd f;
- ssize_t ret;
-
- if (pos < 0)
- return -EINVAL;
- f = fdget(fd);
- if (!f.file)
- return -EBADF;
- ret = -ESPIPE;
- if (f.file->f_mode & FMODE_PWRITE)
- ret = compat_writev(f.file, vec, vlen, &pos, flags);
- fdput(f);
- return ret;
+ return do_readv(fd, vec, vlen, flags);
+ return do_preadv(fd, vec, vlen, pos, flags);
}
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
unsigned long, vlen, loff_t, pos)
{
- return do_compat_pwritev64(fd, vec, vlen, pos, 0);
+ return do_pwritev(fd, vec, vlen, pos, 0);
}
#endif
COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *,vec,
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
- return do_compat_pwritev64(fd, vec, vlen, pos, 0);
+ return do_pwritev(fd, vec, vlen, pos, 0);
}
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *, vec,
unsigned long, vlen, loff_t, pos, rwf_t, flags)
{
if (pos == -1)
- return do_compat_writev(fd, vec, vlen, flags);
-
- return do_compat_pwritev64(fd, vec, vlen, pos, flags);
+ return do_writev(fd, vec, vlen, flags);
+ return do_pwritev(fd, vec, vlen, pos, flags);
}
#endif
COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd,
- const struct compat_iovec __user *,vec,
+ const struct iovec __user *,vec,
compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
if (pos == -1)
- return do_compat_writev(fd, vec, vlen, flags);
-
- return do_compat_pwritev64(fd, vec, vlen, pos, flags);
+ return do_writev(fd, vec, vlen, flags);
+ return do_pwritev(fd, vec, vlen, pos, flags);
}
-
-#endif
+#endif /* CONFIG_COMPAT */
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
size_t count, loff_t max)
diff --git a/fs/splice.c b/fs/splice.c
index ce75aec..70cc52a 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -33,7 +33,6 @@
#include <linux/security.h>
#include <linux/gfp.h>
#include <linux/socket.h>
-#include <linux/compat.h>
#include <linux/sched/signal.h>
#include "internal.h"
@@ -1352,20 +1351,6 @@
* Currently we punt and implement it as a normal copy, see pipe_to_user().
*
*/
-static long do_vmsplice(struct file *f, struct iov_iter *iter, unsigned int flags)
-{
- if (unlikely(flags & ~SPLICE_F_ALL))
- return -EINVAL;
-
- if (!iov_iter_count(iter))
- return 0;
-
- if (iov_iter_rw(iter) == WRITE)
- return vmsplice_to_pipe(f, iter, flags);
- else
- return vmsplice_to_user(f, iter, flags);
-}
-
SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
unsigned long, nr_segs, unsigned int, flags)
{
@@ -1376,6 +1361,9 @@
struct fd f;
int type;
+ if (unlikely(flags & ~SPLICE_F_ALL))
+ return -EINVAL;
+
f = fdget(fd);
error = vmsplice_type(f, &type);
if (error)
@@ -1383,41 +1371,22 @@
error = import_iovec(type, uiov, nr_segs,
ARRAY_SIZE(iovstack), &iov, &iter);
- if (error >= 0) {
- error = do_vmsplice(f.file, &iter, flags);
- kfree(iov);
- }
+ if (error < 0)
+ goto out_fdput;
+
+ if (!iov_iter_count(&iter))
+ error = 0;
+ else if (iov_iter_rw(&iter) == WRITE)
+ error = vmsplice_to_pipe(f.file, &iter, flags);
+ else
+ error = vmsplice_to_user(f.file, &iter, flags);
+
+ kfree(iov);
+out_fdput:
fdput(f);
return error;
}
-#ifdef CONFIG_COMPAT
-COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
- unsigned int, nr_segs, unsigned int, flags)
-{
- struct iovec iovstack[UIO_FASTIOV];
- struct iovec *iov = iovstack;
- struct iov_iter iter;
- ssize_t error;
- struct fd f;
- int type;
-
- f = fdget(fd);
- error = vmsplice_type(f, &type);
- if (error)
- return error;
-
- error = compat_import_iovec(type, iov32, nr_segs,
- ARRAY_SIZE(iovstack), &iov, &iter);
- if (error >= 0) {
- error = do_vmsplice(f.file, &iter, flags);
- kfree(iov);
- }
- fdput(f);
- return error;
-}
-#endif
-
SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in,
int, fd_out, loff_t __user *, off_out,
size_t, len, unsigned int, flags)
diff --git a/include/linux/compat.h b/include/linux/compat.h
index b354ce5..59b8c85 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -91,6 +91,11 @@
static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#endif /* COMPAT_SYSCALL_DEFINEx */
+struct compat_iovec {
+ compat_uptr_t iov_base;
+ compat_size_t iov_len;
+};
+
#ifdef CONFIG_COMPAT
#ifndef compat_user_stack_pointer
@@ -248,11 +253,6 @@
} _sifields;
} compat_siginfo_t;
-struct compat_iovec {
- compat_uptr_t iov_base;
- compat_size_t iov_len;
-};
-
struct compat_rlimit {
compat_ulong_t rlim_cur;
compat_ulong_t rlim_max;
@@ -451,12 +451,6 @@
struct epoll_event; /* fortunately, this one is fixed-layout */
-extern ssize_t compat_rw_copy_check_uvector(int type,
- const struct compat_iovec __user *uvector,
- unsigned long nr_segs,
- unsigned long fast_segs, struct iovec *fast_pointer,
- struct iovec **ret_pointer);
-
extern void __user *compat_alloc_user_space(unsigned long len);
int compat_restore_altstack(const compat_stack_t __user *uss);
@@ -551,26 +545,22 @@
/* fs/read_write.c */
asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
-asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
- const struct compat_iovec __user *vec, compat_ulong_t vlen);
-asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
- const struct compat_iovec __user *vec, compat_ulong_t vlen);
/* No generic prototype for pread64 and pwrite64 */
asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
compat_ulong_t vlen, u32 pos_low, u32 pos_high);
asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
compat_ulong_t vlen, u32 pos_low, u32 pos_high);
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
asmlinkage long compat_sys_preadv64(unsigned long fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
unsigned long vlen, loff_t pos);
#endif
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
asmlinkage long compat_sys_pwritev64(unsigned long fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
unsigned long vlen, loff_t pos);
#endif
@@ -607,10 +597,6 @@
const compat_sigset_t __user *sigmask,
compat_size_t sigsetsize, int flags);
-/* fs/splice.c */
-asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *,
- unsigned int nr_segs, unsigned int flags);
-
/* fs/stat.c */
asmlinkage long compat_sys_newfstatat(unsigned int dfd,
const char __user *filename,
@@ -794,32 +780,24 @@
int flags);
asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
unsigned vlen, unsigned int flags);
-asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
- const struct compat_iovec __user *lvec,
- compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
- compat_ulong_t riovcnt, compat_ulong_t flags);
-asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
- const struct compat_iovec __user *lvec,
- compat_ulong_t liovcnt, const struct compat_iovec __user *rvec,
- compat_ulong_t riovcnt, compat_ulong_t flags);
asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
const compat_uptr_t __user *argv,
const compat_uptr_t __user *envp, int flags);
asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
-asmlinkage long compat_sys_readv64v2(unsigned long fd,
- const struct compat_iovec __user *vec,
+asmlinkage long compat_sys_preadv64v2(unsigned long fd,
+ const struct iovec __user *vec,
unsigned long vlen, loff_t pos, rwf_t flags);
#endif
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
- const struct compat_iovec __user *vec,
+ const struct iovec __user *vec,
unsigned long vlen, loff_t pos, rwf_t flags);
#endif
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7519ae0..e69b45b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -179,14 +179,6 @@
#define FMODE_BUF_RASYNC ((__force fmode_t)0x40000000)
/*
- * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
- * that indicates that they should check the contents of the iovec are
- * valid, but not check the memory that the iovec elements
- * points too.
- */
-#define CHECK_IOVEC_ONLY -1
-
-/*
* Attribute flags. These should be or-ed together to figure out what
* has been changed!
*/
@@ -1887,11 +1879,6 @@
return file->f_op->mmap(file, vma);
}
-ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
- unsigned long nr_segs, unsigned long fast_segs,
- struct iovec *fast_pointer,
- struct iovec **ret_pointer);
-
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
diff --git a/include/linux/uio.h b/include/linux/uio.h
index f14410c..72d8856 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -266,17 +266,15 @@
size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
struct iov_iter *i);
-ssize_t import_iovec(int type, const struct iovec __user * uvector,
- unsigned nr_segs, unsigned fast_segs,
- struct iovec **iov, struct iov_iter *i);
-
-#ifdef CONFIG_COMPAT
-struct compat_iovec;
-ssize_t compat_import_iovec(int type, const struct compat_iovec __user * uvector,
- unsigned nr_segs, unsigned fast_segs,
- struct iovec **iov, struct iov_iter *i);
-#endif
-
+struct iovec *iovec_from_user(const struct iovec __user *uvector,
+ unsigned long nr_segs, unsigned long fast_segs,
+ struct iovec *fast_iov, bool compat);
+ssize_t import_iovec(int type, const struct iovec __user *uvec,
+ unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
+ struct iov_iter *i);
+ssize_t __import_iovec(int type, const struct iovec __user *uvec,
+ unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
+ struct iov_iter *i, bool compat);
int import_single_range(int type, void __user *buf, size_t len,
struct iovec *iov, struct iov_iter *i);
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 995b36c..c1dfe99 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -207,9 +207,9 @@
#define __NR_write 64
__SYSCALL(__NR_write, sys_write)
#define __NR_readv 65
-__SC_COMP(__NR_readv, sys_readv, compat_sys_readv)
+__SC_COMP(__NR_readv, sys_readv, sys_readv)
#define __NR_writev 66
-__SC_COMP(__NR_writev, sys_writev, compat_sys_writev)
+__SC_COMP(__NR_writev, sys_writev, sys_writev)
#define __NR_pread64 67
__SC_COMP(__NR_pread64, sys_pread64, compat_sys_pread64)
#define __NR_pwrite64 68
@@ -237,7 +237,7 @@
/* fs/splice.c */
#define __NR_vmsplice 75
-__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice)
+__SYSCALL(__NR_vmsplice, sys_vmsplice)
#define __NR_splice 76
__SYSCALL(__NR_splice, sys_splice)
#define __NR_tee 77
@@ -727,11 +727,9 @@
#define __NR_sendmmsg 269
__SC_COMP(__NR_sendmmsg, sys_sendmmsg, compat_sys_sendmmsg)
#define __NR_process_vm_readv 270
-__SC_COMP(__NR_process_vm_readv, sys_process_vm_readv, \
- compat_sys_process_vm_readv)
+__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv)
#define __NR_process_vm_writev 271
-__SC_COMP(__NR_process_vm_writev, sys_process_vm_writev, \
- compat_sys_process_vm_writev)
+__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev)
#define __NR_kcmp 272
__SYSCALL(__NR_kcmp, sys_kcmp)
#define __NR_finit_module 273
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 6351b21..14cae258 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -7,6 +7,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/splice.h>
+#include <linux/compat.h>
#include <net/checksum.h>
#include <linux/scatterlist.h>
#include <linux/instrumented.h>
@@ -1645,16 +1646,145 @@
}
EXPORT_SYMBOL(dup_iter);
+static int copy_compat_iovec_from_user(struct iovec *iov,
+ const struct iovec __user *uvec, unsigned long nr_segs)
+{
+ const struct compat_iovec __user *uiov =
+ (const struct compat_iovec __user *)uvec;
+ int ret = -EFAULT, i;
+
+ if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
+ return -EFAULT;
+
+ for (i = 0; i < nr_segs; i++) {
+ compat_uptr_t buf;
+ compat_ssize_t len;
+
+ unsafe_get_user(len, &uiov[i].iov_len, uaccess_end);
+ unsafe_get_user(buf, &uiov[i].iov_base, uaccess_end);
+
+ /* check for compat_size_t not fitting in compat_ssize_t .. */
+ if (len < 0) {
+ ret = -EINVAL;
+ goto uaccess_end;
+ }
+ iov[i].iov_base = compat_ptr(buf);
+ iov[i].iov_len = len;
+ }
+
+ ret = 0;
+uaccess_end:
+ user_access_end();
+ return ret;
+}
+
+static int copy_iovec_from_user(struct iovec *iov,
+ const struct iovec __user *uvec, unsigned long nr_segs)
+{
+ unsigned long seg;
+
+ if (copy_from_user(iov, uvec, nr_segs * sizeof(*uvec)))
+ return -EFAULT;
+ for (seg = 0; seg < nr_segs; seg++) {
+ if ((ssize_t)iov[seg].iov_len < 0)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+struct iovec *iovec_from_user(const struct iovec __user *uvec,
+ unsigned long nr_segs, unsigned long fast_segs,
+ struct iovec *fast_iov, bool compat)
+{
+ struct iovec *iov = fast_iov;
+ int ret;
+
+ /*
+ * SuS says "The readv() function *may* fail if the iovcnt argument was
+ * less than or equal to 0, or greater than {IOV_MAX}. Linux has
+ * traditionally returned zero for zero segments, so...
+ */
+ if (nr_segs == 0)
+ return iov;
+ if (nr_segs > UIO_MAXIOV)
+ return ERR_PTR(-EINVAL);
+ if (nr_segs > fast_segs) {
+ iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL);
+ if (!iov)
+ return ERR_PTR(-ENOMEM);
+ }
+
+ if (compat)
+ ret = copy_compat_iovec_from_user(iov, uvec, nr_segs);
+ else
+ ret = copy_iovec_from_user(iov, uvec, nr_segs);
+ if (ret) {
+ if (iov != fast_iov)
+ kfree(iov);
+ return ERR_PTR(ret);
+ }
+
+ return iov;
+}
+
+ssize_t __import_iovec(int type, const struct iovec __user *uvec,
+ unsigned nr_segs, unsigned fast_segs, struct iovec **iovp,
+ struct iov_iter *i, bool compat)
+{
+ ssize_t total_len = 0;
+ unsigned long seg;
+ struct iovec *iov;
+
+ iov = iovec_from_user(uvec, nr_segs, fast_segs, *iovp, compat);
+ if (IS_ERR(iov)) {
+ *iovp = NULL;
+ return PTR_ERR(iov);
+ }
+
+ /*
+ * According to the Single Unix Specification we should return EINVAL if
+ * an element length is < 0 when cast to ssize_t or if the total length
+ * would overflow the ssize_t return value of the system call.
+ *
+ * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
+ * overflow case.
+ */
+ for (seg = 0; seg < nr_segs; seg++) {
+ ssize_t len = (ssize_t)iov[seg].iov_len;
+
+ if (!access_ok(iov[seg].iov_base, len)) {
+ if (iov != *iovp)
+ kfree(iov);
+ *iovp = NULL;
+ return -EFAULT;
+ }
+
+ if (len > MAX_RW_COUNT - total_len) {
+ len = MAX_RW_COUNT - total_len;
+ iov[seg].iov_len = len;
+ }
+ total_len += len;
+ }
+
+ iov_iter_init(i, type, iov, nr_segs, total_len);
+ if (iov == *iovp)
+ *iovp = NULL;
+ else
+ *iovp = iov;
+ return total_len;
+}
+
/**
* import_iovec() - Copy an array of &struct iovec from userspace
* into the kernel, check that it is valid, and initialize a new
* &struct iov_iter iterator to access it.
*
* @type: One of %READ or %WRITE.
- * @uvector: Pointer to the userspace array.
+ * @uvec: Pointer to the userspace array.
* @nr_segs: Number of elements in userspace array.
* @fast_segs: Number of elements in @iov.
- * @iov: (input and output parameter) Pointer to pointer to (usually small
+ * @iovp: (input and output parameter) Pointer to pointer to (usually small
* on-stack) kernel array.
* @i: Pointer to iterator that will be initialized on success.
*
@@ -1667,51 +1797,15 @@
*
* Return: Negative error code on error, bytes imported on success
*/
-ssize_t import_iovec(int type, const struct iovec __user * uvector,
+ssize_t import_iovec(int type, const struct iovec __user *uvec,
unsigned nr_segs, unsigned fast_segs,
- struct iovec **iov, struct iov_iter *i)
+ struct iovec **iovp, struct iov_iter *i)
{
- ssize_t n;
- struct iovec *p;
- n = rw_copy_check_uvector(type, uvector, nr_segs, fast_segs,
- *iov, &p);
- if (n < 0) {
- if (p != *iov)
- kfree(p);
- *iov = NULL;
- return n;
- }
- iov_iter_init(i, type, p, nr_segs, n);
- *iov = p == *iov ? NULL : p;
- return n;
+ return __import_iovec(type, uvec, nr_segs, fast_segs, iovp, i,
+ in_compat_syscall());
}
EXPORT_SYMBOL(import_iovec);
-#ifdef CONFIG_COMPAT
-#include <linux/compat.h>
-
-ssize_t compat_import_iovec(int type,
- const struct compat_iovec __user * uvector,
- unsigned nr_segs, unsigned fast_segs,
- struct iovec **iov, struct iov_iter *i)
-{
- ssize_t n;
- struct iovec *p;
- n = compat_rw_copy_check_uvector(type, uvector, nr_segs, fast_segs,
- *iov, &p);
- if (n < 0) {
- if (p != *iov)
- kfree(p);
- *iov = NULL;
- return n;
- }
- iov_iter_init(i, type, p, nr_segs, n);
- *iov = p == *iov ? NULL : p;
- return n;
-}
-EXPORT_SYMBOL(compat_import_iovec);
-#endif
-
int import_single_range(int rw, void __user *buf, size_t len,
struct iovec *iov, struct iov_iter *i)
{
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 29c0520..fd12da8 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -14,10 +14,6 @@
#include <linux/slab.h>
#include <linux/syscalls.h>
-#ifdef CONFIG_COMPAT
-#include <linux/compat.h>
-#endif
-
/**
* process_vm_rw_pages - read/write pages from task specified
* @pages: array of pointers to pages we want to copy
@@ -276,20 +272,17 @@
if (rc < 0)
return rc;
if (!iov_iter_count(&iter))
- goto free_iovecs;
-
- rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV,
- iovstack_r, &iov_r);
- if (rc <= 0)
- goto free_iovecs;
-
+ goto free_iov_l;
+ iov_r = iovec_from_user(rvec, riovcnt, UIO_FASTIOV, iovstack_r, false);
+ if (IS_ERR(iov_r)) {
+ rc = PTR_ERR(iov_r);
+ goto free_iov_l;
+ }
rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write);
-
-free_iovecs:
if (iov_r != iovstack_r)
kfree(iov_r);
+free_iov_l:
kfree(iov_l);
-
return rc;
}
@@ -307,68 +300,3 @@
{
return process_vm_rw(pid, lvec, liovcnt, rvec, riovcnt, flags, 1);
}
-
-#ifdef CONFIG_COMPAT
-
-static ssize_t
-compat_process_vm_rw(compat_pid_t pid,
- const struct compat_iovec __user *lvec,
- unsigned long liovcnt,
- const struct compat_iovec __user *rvec,
- unsigned long riovcnt,
- unsigned long flags, int vm_write)
-{
- struct iovec iovstack_l[UIO_FASTIOV];
- struct iovec iovstack_r[UIO_FASTIOV];
- struct iovec *iov_l = iovstack_l;
- struct iovec *iov_r = iovstack_r;
- struct iov_iter iter;
- ssize_t rc = -EFAULT;
- int dir = vm_write ? WRITE : READ;
-
- if (flags != 0)
- return -EINVAL;
-
- rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter);
- if (rc < 0)
- return rc;
- if (!iov_iter_count(&iter))
- goto free_iovecs;
- rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt,
- UIO_FASTIOV, iovstack_r,
- &iov_r);
- if (rc <= 0)
- goto free_iovecs;
-
- rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write);
-
-free_iovecs:
- if (iov_r != iovstack_r)
- kfree(iov_r);
- kfree(iov_l);
- return rc;
-}
-
-COMPAT_SYSCALL_DEFINE6(process_vm_readv, compat_pid_t, pid,
- const struct compat_iovec __user *, lvec,
- compat_ulong_t, liovcnt,
- const struct compat_iovec __user *, rvec,
- compat_ulong_t, riovcnt,
- compat_ulong_t, flags)
-{
- return compat_process_vm_rw(pid, lvec, liovcnt, rvec,
- riovcnt, flags, 0);
-}
-
-COMPAT_SYSCALL_DEFINE6(process_vm_writev, compat_pid_t, pid,
- const struct compat_iovec __user *, lvec,
- compat_ulong_t, liovcnt,
- const struct compat_iovec __user *, rvec,
- compat_ulong_t, riovcnt,
- compat_ulong_t, flags)
-{
- return compat_process_vm_rw(pid, lvec, liovcnt, rvec,
- riovcnt, flags, 1);
-}
-
-#endif
diff --git a/net/compat.c b/net/compat.c
index 95ce707..ddd15af 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -98,8 +98,8 @@
if (err)
return err;
- err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr),
- len, UIO_FASTIOV, iov, &kmsg->msg_iter);
+ err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len,
+ UIO_FASTIOV, iov, &kmsg->msg_iter);
return err < 0 ? err : 0;
}
diff --git a/security/keys/compat.c b/security/keys/compat.c
index 6ee9d8f..1545efd 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -12,39 +12,6 @@
#include "internal.h"
/*
- * Instantiate a key with the specified compatibility multipart payload and
- * link the key into the destination keyring if one is given.
- *
- * The caller must have the appropriate instantiation permit set for this to
- * work (see keyctl_assume_authority). No other permissions are required.
- *
- * If successful, 0 will be returned.
- */
-static long compat_keyctl_instantiate_key_iov(
- key_serial_t id,
- const struct compat_iovec __user *_payload_iov,
- unsigned ioc,
- key_serial_t ringid)
-{
- struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
- struct iov_iter from;
- long ret;
-
- if (!_payload_iov)
- ioc = 0;
-
- ret = compat_import_iovec(WRITE, _payload_iov, ioc,
- ARRAY_SIZE(iovstack), &iov,
- &from);
- if (ret < 0)
- return ret;
-
- ret = keyctl_instantiate_key_common(id, &from, ringid);
- kfree(iov);
- return ret;
-}
-
-/*
* The key control system call, 32-bit compatibility version for 64-bit archs
*/
COMPAT_SYSCALL_DEFINE5(keyctl, u32, option,
@@ -114,8 +81,8 @@
return keyctl_reject_key(arg2, arg3, arg4, arg5);
case KEYCTL_INSTANTIATE_IOV:
- return compat_keyctl_instantiate_key_iov(
- arg2, compat_ptr(arg3), arg4, arg5);
+ return keyctl_instantiate_key_iov(arg2, compat_ptr(arg3), arg4,
+ arg5);
case KEYCTL_INVALIDATE:
return keyctl_invalidate_key(arg2);
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 338a526..9b9cf3b 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -262,11 +262,6 @@
const struct iovec __user *,
unsigned, key_serial_t);
extern long keyctl_invalidate_key(key_serial_t);
-
-struct iov_iter;
-extern long keyctl_instantiate_key_common(key_serial_t,
- struct iov_iter *,
- key_serial_t);
extern long keyctl_restrict_keyring(key_serial_t id,
const char __user *_type,
const char __user *_restriction);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 9febd37..e26bbcc 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1164,7 +1164,7 @@
*
* If successful, 0 will be returned.
*/
-long keyctl_instantiate_key_common(key_serial_t id,
+static long keyctl_instantiate_key_common(key_serial_t id,
struct iov_iter *from,
key_serial_t ringid)
{
diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h
index 995b36c..c1dfe99 100644
--- a/tools/include/uapi/asm-generic/unistd.h
+++ b/tools/include/uapi/asm-generic/unistd.h
@@ -207,9 +207,9 @@
#define __NR_write 64
__SYSCALL(__NR_write, sys_write)
#define __NR_readv 65
-__SC_COMP(__NR_readv, sys_readv, compat_sys_readv)
+__SC_COMP(__NR_readv, sys_readv, sys_readv)
#define __NR_writev 66
-__SC_COMP(__NR_writev, sys_writev, compat_sys_writev)
+__SC_COMP(__NR_writev, sys_writev, sys_writev)
#define __NR_pread64 67
__SC_COMP(__NR_pread64, sys_pread64, compat_sys_pread64)
#define __NR_pwrite64 68
@@ -237,7 +237,7 @@
/* fs/splice.c */
#define __NR_vmsplice 75
-__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice)
+__SYSCALL(__NR_vmsplice, sys_vmsplice)
#define __NR_splice 76
__SYSCALL(__NR_splice, sys_splice)
#define __NR_tee 77
@@ -727,11 +727,9 @@
#define __NR_sendmmsg 269
__SC_COMP(__NR_sendmmsg, sys_sendmmsg, compat_sys_sendmmsg)
#define __NR_process_vm_readv 270
-__SC_COMP(__NR_process_vm_readv, sys_process_vm_readv, \
- compat_sys_process_vm_readv)
+__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv)
#define __NR_process_vm_writev 271
-__SC_COMP(__NR_process_vm_writev, sys_process_vm_writev, \
- compat_sys_process_vm_writev)
+__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev)
#define __NR_kcmp 272
__SYSCALL(__NR_kcmp, sys_kcmp)
#define __NR_finit_module 273
diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
index 3ca6fe0..a188f05 100644
--- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
@@ -189,8 +189,8 @@
142 common _newselect sys_select compat_sys_select
143 common flock sys_flock
144 common msync sys_msync
-145 common readv sys_readv compat_sys_readv
-146 common writev sys_writev compat_sys_writev
+145 common readv sys_readv
+146 common writev sys_writev
147 common getsid sys_getsid
148 common fdatasync sys_fdatasync
149 nospu _sysctl sys_ni_syscall
@@ -363,7 +363,7 @@
282 common unshare sys_unshare
283 common splice sys_splice
284 common tee sys_tee
-285 common vmsplice sys_vmsplice compat_sys_vmsplice
+285 common vmsplice sys_vmsplice
286 common openat sys_openat compat_sys_openat
287 common mkdirat sys_mkdirat
288 common mknodat sys_mknodat
@@ -443,8 +443,8 @@
348 common syncfs sys_syncfs
349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg
350 common setns sys_setns
-351 nospu process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-352 nospu process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+351 nospu process_vm_readv sys_process_vm_readv
+352 nospu process_vm_writev sys_process_vm_writev
353 nospu finit_module sys_finit_module
354 nospu kcmp sys_kcmp
355 common sched_setattr sys_sched_setattr
diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
index 6a0bbea..c44c830 100644
--- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl
+++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl
@@ -134,8 +134,8 @@
142 64 select sys_select -
143 common flock sys_flock sys_flock
144 common msync sys_msync compat_sys_msync
-145 common readv sys_readv compat_sys_readv
-146 common writev sys_writev compat_sys_writev
+145 common readv sys_readv
+146 common writev sys_writev
147 common getsid sys_getsid sys_getsid
148 common fdatasync sys_fdatasync sys_fdatasync
149 common _sysctl - -
@@ -316,7 +316,7 @@
306 common splice sys_splice compat_sys_splice
307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range
308 common tee sys_tee compat_sys_tee
-309 common vmsplice sys_vmsplice compat_sys_vmsplice
+309 common vmsplice sys_vmsplice sys_vmsplice
310 common move_pages sys_move_pages compat_sys_move_pages
311 common getcpu sys_getcpu compat_sys_getcpu
312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait
@@ -347,8 +347,8 @@
337 common clock_adjtime sys_clock_adjtime compat_sys_clock_adjtime
338 common syncfs sys_syncfs sys_syncfs
339 common setns sys_setns sys_setns
-340 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv
-341 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev
+340 common process_vm_readv sys_process_vm_readv sys_process_vm_readv
+341 common process_vm_writev sys_process_vm_writev sys_process_vm_writev
342 common s390_runtime_instr sys_s390_runtime_instr sys_s390_runtime_instr
343 common kcmp sys_kcmp compat_sys_kcmp
344 common finit_module sys_finit_module compat_sys_finit_module
diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
index f30d6ae..3478096 100644
--- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
@@ -371,8 +371,8 @@
512 x32 rt_sigaction compat_sys_rt_sigaction
513 x32 rt_sigreturn compat_sys_x32_rt_sigreturn
514 x32 ioctl compat_sys_ioctl
-515 x32 readv compat_sys_readv
-516 x32 writev compat_sys_writev
+515 x32 readv sys_readv
+516 x32 writev sys_writev
517 x32 recvfrom compat_sys_recvfrom
518 x32 sendmsg compat_sys_sendmsg
519 x32 recvmsg compat_sys_recvmsg
@@ -388,15 +388,15 @@
529 x32 waitid compat_sys_waitid
530 x32 set_robust_list compat_sys_set_robust_list
531 x32 get_robust_list compat_sys_get_robust_list
-532 x32 vmsplice compat_sys_vmsplice
+532 x32 vmsplice sys_vmsplice
533 x32 move_pages compat_sys_move_pages
534 x32 preadv compat_sys_preadv64
535 x32 pwritev compat_sys_pwritev64
536 x32 rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo
537 x32 recvmmsg compat_sys_recvmmsg_time64
538 x32 sendmmsg compat_sys_sendmmsg
-539 x32 process_vm_readv compat_sys_process_vm_readv
-540 x32 process_vm_writev compat_sys_process_vm_writev
+539 x32 process_vm_readv sys_process_vm_readv
+540 x32 process_vm_writev sys_process_vm_writev
541 x32 setsockopt sys_setsockopt
542 x32 getsockopt sys_getsockopt
543 x32 io_setup compat_sys_io_setup
