From: Christian Brauner <brauner@xxxxxxxxxx>
[ Upstream commit 985a6d0b3c800265a2d5312a52c549bf09254e55 ]
Return EOPNOTSUPP when the POSIX ACL version doesn't match and zero if
there are no entries. This will allow us to reuse the helper in
posix_acl_from_xattr(). This change will have no user visible effects.
Fixes: 0c5fd887d2bb ("acl: move idmapped mount fixup into vfs_{g,s}etxattr()")
Signed-off-by: Christian Brauner (Microsoft) <brauner@xxxxxxxxxx>
Reviewed-by: Seth Forshee (DigitalOcean) <sforshee@xxxxxxxxxx>>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/posix_acl.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 5af33800743e..abe387700ba9 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -710,9 +710,9 @@ EXPORT_SYMBOL(posix_acl_update_mode);
/*
* Fix up the uids and gids in posix acl extended attributes in place.
*/
-static int posix_acl_fix_xattr_common(void *value, size_t size)
+static int posix_acl_fix_xattr_common(const void *value, size_t size)
{
- struct posix_acl_xattr_header *header = value;
+ const struct posix_acl_xattr_header *header = value;
int count;
if (!header)
@@ -720,13 +720,13 @@ static int posix_acl_fix_xattr_common(void *value, size_t size)
if (size < sizeof(struct posix_acl_xattr_header))
return -EINVAL;
if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
- return -EINVAL;
+ return -EOPNOTSUPP;
count = posix_acl_xattr_count(size);
if (count < 0)
return -EINVAL;
if (count == 0)
- return -EINVAL;
+ return 0;
return count;
}
@@ -748,7 +748,7 @@ void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
return;
count = posix_acl_fix_xattr_common(value, size);
- if (count < 0)
+ if (count <= 0)
return;
for (end = entry + count; entry != end; entry++) {
@@ -788,7 +788,7 @@ void posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
return;
count = posix_acl_fix_xattr_common(value, size);
- if (count < 0)
+ if (count <= 0)
return;
for (end = entry + count; entry != end; entry++) {
@@ -822,7 +822,7 @@ static void posix_acl_fix_xattr_userns(
kgid_t gid;
count = posix_acl_fix_xattr_common(value, size);
- if (count < 0)
+ if (count <= 0)
return;
for (end = entry + count; entry != end; entry++) {
@@ -870,16 +870,9 @@ posix_acl_from_xattr(struct user_namespace *user_ns,
struct posix_acl *acl;
struct posix_acl_entry *acl_e;
- if (!value)
- return NULL;
- if (size < sizeof(struct posix_acl_xattr_header))
- return ERR_PTR(-EINVAL);
- if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
- return ERR_PTR(-EOPNOTSUPP);
-
- count = posix_acl_xattr_count(size);
+ count = posix_acl_fix_xattr_common(value, size);
if (count < 0)
- return ERR_PTR(-EINVAL);
+ return ERR_PTR(count);
if (count == 0)
return NULL;
--
2.35.1
