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btrfs: use u64 for buffer sizes in the tree search ioctls

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[ Upstream commit dec96fc2dc ]

In the tree search v2 ioctl we use the type size_t, which is an unsigned
long, to track the buffer size in the local variable 'buf_size'. An
unsigned long is 32 bits wide on a 32 bits architecture. The buffer size
defined in struct btrfs_ioctl_search_args_v2 is a u64, so when we later
try to copy the local variable 'buf_size' to the argument struct, when
the search returns -EOVERFLOW, we copy only 32 bits which will be a
problem on big endian systems.

Fix this by using a u64 type for the buffer sizes, not only at
btrfs_ioctl_tree_search_v2(), but also everywhere down the call chain
so that we can use the u64 at btrfs_ioctl_tree_search_v2().

Fixes: cc68a8a5a4 ("btrfs: new ioctl TREE_SEARCH_V2")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/linux-btrfs/ce6f4bd6-9453-4ffe-ba00-cee35495e10f@moroto.mountain/
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Filipe Manana 2023-10-13 10:05:48 +01:00 committed by Greg Kroah-Hartman
parent f9f5e8cecb
commit 3443337acd
1 changed files with 5 additions and 5 deletions
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10
fs/btrfs/ioctl.c
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@ -2094,7 +2094,7 @@ static noinline int key_in_sk(struct btrfs_key *key,
static noinline int copy_to_sk(struct btrfs_path *path,
struct btrfs_key *key,
struct btrfs_ioctl_search_key *sk,
size_t *buf_size,
u64 *buf_size,
char __user *ubuf,
unsigned long *sk_offset,
int *num_found)
@ -2226,7 +2226,7 @@ out:
static noinline int search_ioctl(struct inode *inode,
struct btrfs_ioctl_search_key *sk,
size_t *buf_size,
u64 *buf_size,
char __user *ubuf)
{
struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
@ -2295,7 +2295,7 @@ static noinline int btrfs_ioctl_tree_search(struct file *file,
struct btrfs_ioctl_search_key sk;
struct inode *inode;
int ret;
size_t buf_size;
u64 buf_size;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@ -2329,8 +2329,8 @@ static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
struct btrfs_ioctl_search_args_v2 args;
struct inode *inode;
int ret;
size_t buf_size;
const size_t buf_limit = SZ_16M;
u64 buf_size;
const u64 buf_limit = SZ_16M;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;