Fix prlimit64 for suid/sgid processes

Since check_prlimit_permission always fails in the case of SUID/GUID
processes, such processes are not able to read or set their own limits.
This commit changes this by assuming that process can always read/change
its own limits.

Signed-off-by: Kacper Kornet <kornet@camk.edu.pl>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sys.c b/kernel/sys.c
index 31b71a276b40eda1c64578666ac7e1fadb77642f..18da702ec813c491c758b6f28e86a31a71ba60b5 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1385,7 +1385,8 @@ static int check_prlimit_permission(struct task_struct *task)
        const struct cred *cred = current_cred(), *tcred;
 
        tcred = __task_cred(task);
-       if ((cred->uid != tcred->euid ||
+       if (current != task &&
+           (cred->uid != tcred->euid ||
             cred->uid != tcred->suid ||
             cred->uid != tcred->uid  ||
             cred->gid != tcred->egid ||