From: David Howells Date: Fri, 7 Oct 2005 15:41:24 +0000 (+0100) Subject: [PATCH] Keys: Possessor permissions should be additive X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7ab501db8cb6659efdf04034e0de6b44c059a51b;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [PATCH] Keys: Possessor permissions should be additive This patch makes the possessor permissions on a key additive with user/group/other permissions on the same key. This permits extra rights to be granted to the possessor of a key without taking away any rights conferred by them owning the key or having common group membership. Signed-Off-By: David Howells Signed-off-by: Linus Torvalds --- diff --git a/security/keys/permission.c b/security/keys/permission.c index 1c3651670ce9..03db073ba45c 100644 --- a/security/keys/permission.c +++ b/security/keys/permission.c @@ -27,12 +27,6 @@ int key_task_permission(const key_ref_t key_ref, key = key_ref_to_ptr(key_ref); - /* use the top 8-bits of permissions for keys the caller possesses */ - if (is_key_possessed(key_ref)) { - kperm = key->perm >> 24; - goto use_these_perms; - } - /* use the second 8-bits of permissions for keys the caller owns */ if (key->uid == context->fsuid) { kperm = key->perm >> 16; @@ -61,6 +55,12 @@ int key_task_permission(const key_ref_t key_ref, kperm = key->perm; use_these_perms: + /* use the top 8-bits of permissions for keys the caller possesses + * - possessor permissions are additive with other permissions + */ + if (is_key_possessed(key_ref)) + kperm |= key->perm >> 24; + kperm = kperm & perm & KEY_ALL; return kperm == perm;