[PATCH 5.8.y] erofs: avoid duplicated permission check for "trusted." xattrs

* [PATCH 5.8.y] erofs: avoid duplicated permission check for "trusted." xattrs
       [not found] <20201031030058.850-1-hsiangkao.ref@aol.com>
@ 2020-10-31  3:00 ` Gao Xiang via Linux-erofs
  0 siblings, 0 replies; only message in thread
From: Gao Xiang via Linux-erofs @ 2020-10-31  3:00 UTC (permalink / raw)
  To: Greg Kroah-Hartman, stable; +Cc: Hongyu Jin, linux-erofs, LKML

From: Gao Xiang <hsiangkao@redhat.com>

commit d578b46db69d125a654f509bdc9091d84e924dc8 upstream.

Don't recheck it since xattr_permission() already
checks CAP_SYS_ADMIN capability.

Just follow 5d3ce4f70172 ("f2fs: avoid duplicated permission check for "trusted." xattrs")

Reported-by: Hongyu Jin <hongyu.jin@unisoc.com>
[ Gao Xiang: since it could cause some complex Android overlay
  permission issue as well on android-5.4+, it'd be better to
  backport to 5.4+ rather than pure cleanup on mainline. ]
Cc: <stable@vger.kernel.org> # 5.4+
Link: https://lore.kernel.org/r/20200811070020.6339-1-hsiangkao@redhat.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
---
 fs/erofs/xattr.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 87e437e7b34f..f86e3247febc 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -473,8 +473,6 @@ static int erofs_xattr_generic_get(const struct xattr_handler *handler,
 			return -EOPNOTSUPP;
 		break;
 	case EROFS_XATTR_INDEX_TRUSTED:
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
 		break;
 	case EROFS_XATTR_INDEX_SECURITY:
 		break;
-- 
2.24.0


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