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ovl: add override_creds cleanup guard extension for overlayfs

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Overlayfs plucks the relevant creds from the superblock. Extend the
override_creds cleanup class I added to override_creds_ovl which uses
the ovl_override_creds() function as initialization helper. Add
with_ovl_creds() based on this new class.

Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-1-b31603935724@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-11-17 10:33:32 +01:00
parent 658d1322fa
commit 6f5c84162a
1 changed files with 5 additions and 0 deletions
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5
fs/overlayfs/overlayfs.h
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@@ -457,6 +457,11 @@ struct dentry *ovl_workdir(struct dentry *dentry);
const struct cred *ovl_override_creds(struct super_block *sb);
void ovl_revert_creds(const struct cred *old_cred);
EXTEND_CLASS(override_creds, _ovl, ovl_override_creds(sb), struct super_block *sb)
#define with_ovl_creds(sb) \
scoped_class(override_creds_ovl, __UNIQUE_ID(label), sb)
static inline const struct cred *ovl_creds(struct super_block *sb)
{
return OVL_FS(sb)->creator_cred;