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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
commit96d4f267e40f9509e8a66e2b39e8b95655617693 (patch)
treedf03d142d405652392707b1b80c284d68d6ea6ab /fs
parent135143b2cac43d2a1ec73b53033b9473fbbcce6d (diff)
downloadnet-96d4f267e40f9509e8a66e2b39e8b95655617693.tar.gz
Remove 'type' argument from access_ok() function
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/binfmt_aout.c4
-rw-r--r--fs/btrfs/send.c2
-rw-r--r--fs/eventpoll.c2
-rw-r--r--fs/fat/dir.c4
-rw-r--r--fs/ioctl.c2
-rw-r--r--fs/namespace.c2
-rw-r--r--fs/ocfs2/dlmfs/dlmfs.c4
-rw-r--r--fs/pstore/pmsg.c2
-rw-r--r--fs/pstore/ram_core.c2
-rw-r--r--fs/read_write.c13
-rw-r--r--fs/readdir.c10
-rw-r--r--fs/select.c11
12 files changed, 26 insertions, 32 deletions
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index c3deb2e35f2030..ca9725f18e0056 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -78,9 +78,9 @@ static int aout_core_dump(struct coredump_params *cprm)
/* make sure we actually have a data and stack area to dump */
set_fs(USER_DS);
- if (!access_ok(VERIFY_READ, START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
+ if (!access_ok(START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
dump.u_dsize = 0;
- if (!access_ok(VERIFY_READ, START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
+ if (!access_ok(START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
dump.u_ssize = 0;
set_fs(KERNEL_DS);
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 1b15b43905f88a..7ea2d6b1f170bc 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6646,7 +6646,7 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg)
goto out;
}
- if (!access_ok(VERIFY_READ, arg->clone_sources,
+ if (!access_ok(arg->clone_sources,
sizeof(*arg->clone_sources) *
arg->clone_sources_count)) {
ret = -EFAULT;
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 8a5a1010886bad..7ebae39fbcb375 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2172,7 +2172,7 @@ static int do_epoll_wait(int epfd, struct epoll_event __user *events,
return -EINVAL;
/* Verify that the area passed by the user is writeable */
- if (!access_ok(VERIFY_WRITE, events, maxevents * sizeof(struct epoll_event)))
+ if (!access_ok(events, maxevents * sizeof(struct epoll_event)))
return -EFAULT;
/* Get the "struct file *" for the eventpoll file */
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index c8366cb8eccd7c..0295a095b92053 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -805,7 +805,7 @@ static long fat_dir_ioctl(struct file *filp, unsigned int cmd,
return fat_generic_ioctl(filp, cmd, arg);
}
- if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2])))
+ if (!access_ok(d1, sizeof(struct __fat_dirent[2])))
return -EFAULT;
/*
* Yes, we don't need this put_user() absolutely. However old
@@ -845,7 +845,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
}
- if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
+ if (!access_ok(d1, sizeof(struct compat_dirent[2])))
return -EFAULT;
/*
* Yes, we don't need this put_user() absolutely. However old
diff --git a/fs/ioctl.c b/fs/ioctl.c
index d64f622cac8b8f..fef3a6bf7c78dd 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -203,7 +203,7 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
fieinfo.fi_extents_start = ufiemap->fm_extents;
if (fiemap.fm_extent_count != 0 &&
- !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
+ !access_ok(fieinfo.fi_extents_start,
fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
return -EFAULT;
diff --git a/fs/namespace.c b/fs/namespace.c
index a7f91265ea671d..97b7c7098c3dd4 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2651,7 +2651,7 @@ static long exact_copy_from_user(void *to, const void __user * from,
const char __user *f = from;
char c;
- if (!access_ok(VERIFY_READ, from, n))
+ if (!access_ok(from, n))
return n;
current->kernel_uaccess_faults_ok++;
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index b8fa1487cd85a4..8decbe95dcecb9 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -254,7 +254,7 @@ static ssize_t dlmfs_file_read(struct file *filp,
if (!count)
return 0;
- if (!access_ok(VERIFY_WRITE, buf, count))
+ if (!access_ok(buf, count))
return -EFAULT;
/* don't read past the lvb */
@@ -302,7 +302,7 @@ static ssize_t dlmfs_file_write(struct file *filp,
if (!count)
return 0;
- if (!access_ok(VERIFY_READ, buf, count))
+ if (!access_ok(buf, count))
return -EFAULT;
/* don't write past the lvb */
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index 24db02de178745..97fcef74e5af0b 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -33,7 +33,7 @@ static ssize_t write_pmsg(struct file *file, const char __user *buf,
record.size = count;
/* check outside lock, page in any data. write_user also checks */
- if (!access_ok(VERIFY_READ, buf, count))
+ if (!access_ok(buf, count))
return -EFAULT;
mutex_lock(&pmsg_lock);
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index c11711c2cc8367..f375c0735351cb 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -357,7 +357,7 @@ int notrace persistent_ram_write_user(struct persistent_ram_zone *prz,
int rem, ret = 0, c = count;
size_t start;
- if (unlikely(!access_ok(VERIFY_READ, s, count)))
+ if (unlikely(!access_ok(s, count)))
return -EFAULT;
if (unlikely(c > prz->buffer_size)) {
s += c - prz->buffer_size;
diff --git a/fs/read_write.c b/fs/read_write.c
index 58f30537c47a0a..ff3c5e6f87cfaa 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -442,7 +442,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
return -EBADF;
if (!(file->f_mode & FMODE_CAN_READ))
return -EINVAL;
- if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
+ if (unlikely(!access_ok(buf, count)))
return -EFAULT;
ret = rw_verify_area(READ, file, pos, count);
@@ -538,7 +538,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
return -EBADF;
if (!(file->f_mode & FMODE_CAN_WRITE))
return -EINVAL;
- if (unlikely(!access_ok(VERIFY_READ, buf, count)))
+ if (unlikely(!access_ok(buf, count)))
return -EFAULT;
ret = rw_verify_area(WRITE, file, pos, count);
@@ -718,9 +718,6 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
return ret;
}
-/* A write operation does a read from user space and vice versa */
-#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
-
/**
* rw_copy_check_uvector() - Copy an array of &struct iovec from userspace
* into the kernel and check that it is valid.
@@ -810,7 +807,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
goto out;
}
if (type >= 0
- && unlikely(!access_ok(vrfy_dir(type), buf, len))) {
+ && unlikely(!access_ok(buf, len))) {
ret = -EFAULT;
goto out;
}
@@ -856,7 +853,7 @@ ssize_t compat_rw_copy_check_uvector(int type,
*ret_pointer = iov;
ret = -EFAULT;
- if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
+ if (!access_ok(uvector, nr_segs*sizeof(*uvector)))
goto out;
/*
@@ -881,7 +878,7 @@ ssize_t compat_rw_copy_check_uvector(int type,
if (len < 0) /* size_t not fitting in compat_ssize_t .. */
goto out;
if (type >= 0 &&
- !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
+ !access_ok(compat_ptr(buf), len)) {
ret = -EFAULT;
goto out;
}
diff --git a/fs/readdir.c b/fs/readdir.c
index d97f548e632339..2f6a4534e0dfeb 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -105,7 +105,7 @@ static int fillonedir(struct dir_context *ctx, const char *name, int namlen,
}
buf->result++;
dirent = buf->dirent;
- if (!access_ok(VERIFY_WRITE, dirent,
+ if (!access_ok(dirent,
(unsigned long)(dirent->d_name + namlen + 1) -
(unsigned long)dirent))
goto efault;
@@ -221,7 +221,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
};
int error;
- if (!access_ok(VERIFY_WRITE, dirent, count))
+ if (!access_ok(dirent, count))
return -EFAULT;
f = fdget_pos(fd);
@@ -304,7 +304,7 @@ int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
};
int error;
- if (!access_ok(VERIFY_WRITE, dirent, count))
+ if (!access_ok(dirent, count))
return -EFAULT;
f = fdget_pos(fd);
@@ -365,7 +365,7 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name,
}
buf->result++;
dirent = buf->dirent;
- if (!access_ok(VERIFY_WRITE, dirent,
+ if (!access_ok(dirent,
(unsigned long)(dirent->d_name + namlen + 1) -
(unsigned long)dirent))
goto efault;
@@ -475,7 +475,7 @@ COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
};
int error;
- if (!access_ok(VERIFY_WRITE, dirent, count))
+ if (!access_ok(dirent, count))
return -EFAULT;
f = fdget_pos(fd);
diff --git a/fs/select.c b/fs/select.c
index 4c8652390c944b..d0f35dbc0e8fd3 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -381,9 +381,6 @@ typedef struct {
#define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long))
/*
- * We do a VERIFY_WRITE here even though we are only reading this time:
- * we'll write to it eventually..
- *
* Use "unsigned long" accesses to let user-mode fd_set's be long-aligned.
*/
static inline
@@ -782,7 +779,7 @@ SYSCALL_DEFINE6(pselect6, int, n, fd_set __user *, inp, fd_set __user *, outp,
sigset_t __user *up = NULL;
if (sig) {
- if (!access_ok(VERIFY_READ, sig, sizeof(void *)+sizeof(size_t))
+ if (!access_ok(sig, sizeof(void *)+sizeof(size_t))
|| __get_user(up, (sigset_t __user * __user *)sig)
|| __get_user(sigsetsize,
(size_t __user *)(sig+sizeof(void *))))
@@ -802,7 +799,7 @@ SYSCALL_DEFINE6(pselect6_time32, int, n, fd_set __user *, inp, fd_set __user *,
sigset_t __user *up = NULL;
if (sig) {
- if (!access_ok(VERIFY_READ, sig, sizeof(void *)+sizeof(size_t))
+ if (!access_ok(sig, sizeof(void *)+sizeof(size_t))
|| __get_user(up, (sigset_t __user * __user *)sig)
|| __get_user(sigsetsize,
(size_t __user *)(sig+sizeof(void *))))
@@ -1368,7 +1365,7 @@ COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp,
compat_uptr_t up = 0;
if (sig) {
- if (!access_ok(VERIFY_READ, sig,
+ if (!access_ok(sig,
sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
__get_user(up, (compat_uptr_t __user *)sig) ||
__get_user(sigsetsize,
@@ -1390,7 +1387,7 @@ COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
compat_uptr_t up = 0;
if (sig) {
- if (!access_ok(VERIFY_READ, sig,
+ if (!access_ok(sig,
sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
__get_user(up, (compat_uptr_t __user *)sig) ||
__get_user(sigsetsize,
generated by cgit 1.2.3-korg (git 2.43.0) at 2025-12-08 23:09:27 +0000