diff options
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 7ff6d1b10cec..196c7134bee6 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1432,25 +1432,26 @@ out: } /* rcu lock must be held */ -static int check_prlimit_permission(struct task_struct *task) +static int check_prlimit_permission(struct task_struct *task, + unsigned int flags) { const struct cred *cred = current_cred(), *tcred; + bool id_match; if (current == task) return 0; tcred = __task_cred(task); - if (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)) - return 0; - if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) - return 0; + 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)); + if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) + return -EPERM; - return -EPERM; + return security_task_prlimit(cred, tcred, flags); } SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, @@ -1460,12 +1461,17 @@ SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, struct rlimit64 old64, new64; struct rlimit old, new; struct task_struct *tsk; + unsigned int checkflags = 0; int ret; + if (old_rlim) + checkflags |= LSM_PRLIMIT_READ; + if (new_rlim) { if (copy_from_user(&new64, new_rlim, sizeof(new64))) return -EFAULT; rlim64_to_rlim(&new64, &new); + checkflags |= LSM_PRLIMIT_WRITE; } rcu_read_lock(); @@ -1474,7 +1480,7 @@ SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, rcu_read_unlock(); return -ESRCH; } - ret = check_prlimit_permission(tsk); + ret = check_prlimit_permission(tsk, checkflags); if (ret) { rcu_read_unlock(); return ret; |