diff mbox series

[4/5] memfd: Pass argument of memfd_fcntl as int

Message ID 20230414100212.766118-5-Luca.Vizzarro@arm.com (mailing list archive)
State New
Headers show
Series None | expand

Commit Message

Luca Vizzarro April 14, 2023, 10:02 a.m. UTC 
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.

Cc: Kevin Brodsky <Kevin.Brodsky@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>
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: linux-fsdevel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Luca Vizzarro <Luca.Vizzarro@arm.com>
---
 include/linux/memfd.h | 4 ++--
 mm/memfd.c            | 6 +-----
 2 files changed, 3 insertions(+), 7 deletions(-)

--
2.34.1

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diff mbox series

Patch

diff --git a/include/linux/memfd.h b/include/linux/memfd.h
index 4f1600413f91..e7abf6fa4c52 100644
--- a/include/linux/memfd.h
+++ b/include/linux/memfd.h
@@ -5,9 +5,9 @@ 
 #include <linux/file.h>

 #ifdef CONFIG_MEMFD_CREATE
-extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned long arg);
+extern long memfd_fcntl(struct file *file, unsigned int cmd, unsigned int arg);
 #else
-static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned long a)
+static inline long memfd_fcntl(struct file *f, unsigned int c, unsigned int a)
 {
        return -EINVAL;
 }
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: