diff options
| author | Luca Vizzarro <Luca.Vizzarro@arm.com> | 2023-04-14 16:24:58 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-18 16:30:11 -0700 |
| commit | f7b8f70ba44fb63df47b6fc3204d49ac2885de64 (patch) | |
| tree | e9f891a518dc48796dc7bae0d32f1190d935053e /mm/memfd.c | |
| parent | 7f63cf2d9b9bbe7b90f808927558a66ff737d399 (diff) | |
memfd: pass argument of memfd_fcntl as int
The interface for fcntl expects the argument passed for the command
F_ADD_SEALS to be of type int. The current code wrongly treats it as a
long. In order to avoid access to undefined bits, we should explicitly
cast the argument to int.
This commit changes the signature of all the related and helper functions
so that they treat the argument as int instead of long.
Link: https://lkml.kernel.org/r/20230414152459.816046-5-Luca.Vizzarro@arm.com
Signed-off-by: Luca Vizzarro <Luca.Vizzarro@arm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Kevin Brodsky <Kevin.Brodsky@arm.com>
Cc: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Cc: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: David Laight <David.Laight@ACULAB.com>
Cc: Mark Rutland <Mark.Rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memfd.c')
| -rw-r--r-- | mm/memfd.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/mm/memfd.c b/mm/memfd.c index a0a7a37e8177..69b90c31d38c 100644 --- a/mm/memfd.c +++ b/mm/memfd.c @@ -243,16 +243,12 @@ static int memfd_get_seals(struct file *file) return seals ? *seals : -EINVAL; } -long memfd_fcntl(struct file *file, unsigned int cmd, unsigned long arg) +long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg) { long error; switch (cmd) { case F_ADD_SEALS: - /* disallow upper 32bit */ - if (arg > UINT_MAX) - return -EINVAL; - error = memfd_add_seals(file, arg); break; case F_GET_SEALS: |