[PATCH 6.6 079/638] fs: Fix rw_hint validation

Sasha Levin
2024-03-24T23:02:35Z

From: Bart Van Assche <bvanassche@acm.org>

[ Upstream commit ec16b147a55bfa14e858234eb7b1a7c8e7cd5021 ]

Reject values that are valid rw_hints after truncation but not before
truncation by passing an untruncated value to rw_hint_valid().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 5657cb0797c4 ("fs/fcntl: use copy_to/from_user() for u64 types")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240202203926.2478590-2-bvanassche@acm.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/fcntl.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index e871009f6c889..9f606714d081b 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -268,7 +268,7 @@ static int f_getowner_uids(struct file *filp, unsigned long arg)
}
#endif

-static bool rw_hint_valid(enum rw_hint hint)
+static bool rw_hint_valid(u64 hint)
{
switch (hint) {
case RWH_WRITE_LIFE_NOT_SET:
@@ -288,19 +288,17 @@ static long fcntl_rw_hint(struct file *file, unsigned int cmd,
{
struct inode *inode = file_inode(file);
u64 __user *argp = (u64 __user *)arg;
- enum rw_hint hint;
- u64 h;
+ u64 hint;

switch (cmd) {
case F_GET_RW_HINT:
- h = inode->i_write_hint;
- if (copy_to_user(argp, &h, sizeof(*argp)))
+ hint = inode->i_write_hint;
+ if (copy_to_user(argp, &hint, sizeof(*argp)))
return -EFAULT;
return 0;
case F_SET_RW_HINT:
- if (copy_from_user(&h, argp, sizeof(h)))
+ if (copy_from_user(&hint, argp, sizeof(hint)))
return -EFAULT;
- hint = (enum rw_hint) h;
if (!rw_hint_valid(hint))
return -EINVAL;

--
2.43.0