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| author | Seth Forshee <sforshee@kernel.org> | 2023-03-09 14:39:09 -0600 |
|---|---|---|
| committer | Christian Brauner (Microsoft) <brauner@kernel.org> | 2023-03-09 22:36:12 +0100 |
| commit | 42d0c4bdf753063b6eec55415003184d3ca24f6e (patch) | |
| tree | b8f797ca79f4b015cfc32421b75022386468e303 | |
| parent | dc592190a5543c559010e09e8130a1af3f9068d3 (diff) | |
| download | linux-stable-42d0c4bdf753063b6eec55415003184d3ca24f6e.tar.gz linux-stable-42d0c4bdf753063b6eec55415003184d3ca24f6e.tar.bz2 linux-stable-42d0c4bdf753063b6eec55415003184d3ca24f6e.zip | |
filelocks: use mount idmapping for setlease permission check
A user should be allowed to take out a lease via an idmapped mount if
the fsuid matches the mapped uid of the inode. generic_setlease() is
checking the unmapped inode uid, causing these operations to be denied.
Fix this by comparing against the mapped inode uid instead of the
unmapped uid.
Fixes: 9caccd41541a ("fs: introduce MOUNT_ATTR_IDMAP")
Cc: stable@vger.kernel.org
Signed-off-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
| -rw-r--r-- | fs/locks.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/locks.c b/fs/locks.c index d82c4cacdfb9..df8b26a42524 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1863,9 +1863,10 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp, void **priv) { struct inode *inode = file_inode(filp); + vfsuid_t vfsuid = i_uid_into_vfsuid(file_mnt_idmap(filp), inode); int error; - if ((!uid_eq(current_fsuid(), inode->i_uid)) && !capable(CAP_LEASE)) + if ((!vfsuid_eq_kuid(vfsuid, current_fsuid())) && !capable(CAP_LEASE)) return -EACCES; if (!S_ISREG(inode->i_mode)) return -EINVAL; |