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pipe: reject F_SETPIPE_SZ with size over UINT_MAX

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A pipe's size is represented as an 'unsigned int'.  As expected, writing a
value greater than UINT_MAX to /proc/sys/fs/pipe-max-size fails with
EINVAL.  However, the F_SETPIPE_SZ fcntl silently truncates such values to
32 bits, rather than failing with EINVAL as expected.  (It *does* fail
with EINVAL for values above (1 << 31) but <= UINT_MAX.)

Fix this by moving the check against UINT_MAX into round_pipe_size() which
is called in both cases.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Eric Biggers <[email protected]>
Acked-by: Kees Cook <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: "Luis R . Rodriguez" <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Willy Tarreau <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Biggers 2018-02-06 15:42:00 -08:00 • committed by Linus Torvalds
commit 96e99be40e
3 changed files with 5 additions and 5 deletions
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5
fs/pipe.c
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@ -1020,10 +1020,13 @@ const struct file_operations pipefifo_fops = {
* Currently we rely on the pipe array holding a power-of-2 number
* of pages. Returns 0 on error.
*/
unsigned int round_pipe_size(unsigned int size)
unsigned int round_pipe_size(unsigned long size)
{
unsigned long nr_pages;
if (size > UINT_MAX)
return 0;
/* Minimum pipe size, as required by POSIX */
if (size < PAGE_SIZE)
size = PAGE_SIZE;