[PATCH 08/13] sys: use cred_ids_allow_control() for prlimit()

[Josef Bacik <josef@toxicpanda.com>]

check_prlimit_permission() wants the real uid and gid of the caller to be
all three of the uids and gids of the target. Use the library.

No functional change.

Assisted-by: LLM
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 kernel/sys.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index efef06240a8f..5cdfb6b8e485 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1713,12 +1713,7 @@ static int check_prlimit_permission(struct task_struct *task,
 		return 0;
 
 	tcred = __task_cred(task);
-	id_match = (uid_eq(cred->uid, tcred->euid) &&
-		    uid_eq(cred->uid, tcred->suid) &&
-		    uid_eq(cred->uid, tcred->uid)  &&
-		    gid_eq(cred->gid, tcred->egid) &&
-		    gid_eq(cred->gid, tcred->sgid) &&
-		    gid_eq(cred->gid, tcred->gid));
+	id_match = cred_ids_allow_control(cred, CRED_IDS_REAL, tcred);
 	if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
 		return -EPERM;
 

-- 
2.55.0