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splice: missing user pointer access verification

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vmsplice_to_user() must always check the user pointer and length
with access_ok() before copying. Likewise, for the slow path of
copy_from_user_mmap_sem() we need to check that we may read from
the user region.

Signed-off-by: Jens Axboe <[email protected]>
Cc: Wojciech Purczynski <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jens Axboe 2008-02-08 08:49:14 -08:00 • committed by Linus Torvalds
commit 8811930dc7
1 changed files with 8 additions and 0 deletions
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8
fs/splice.c
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@ -1179,6 +1179,9 @@ static int copy_from_user_mmap_sem(void *dst, const void __user *src, size_t n)
{
int partial;
if (!access_ok(VERIFY_READ, src, n))
return -EFAULT;
pagefault_disable();
partial = __copy_from_user_inatomic(dst, src, n);
pagefault_enable();
@ -1387,6 +1390,11 @@ static long vmsplice_to_user(struct file *file, const struct iovec __user *iov,
break;
}
if (unlikely(!access_ok(VERIFY_WRITE, base, len))) {
error = -EFAULT;
break;
}
sd.len = 0;
sd.total_len = len;
sd.flags = flags;