3.2.58-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Richard Guy Briggs <rgb@xxxxxxxxxx>
commit c92cdeb45eea38515e82187f48c2e4f435fb4e25 upstream.
sys_getppid() returns the parent pid of the current process in its own pid
namespace. Since audit filters are based in the init pid namespace, a process
could avoid a filter or trigger an unintended one by being in an alternate pid
namespace or log meaningless information.
Switch to task_ppid_nr() for PPIDs to anchor all audit filters in the
init_pid_ns.
(informed by ebiederman's 6c621b7e)
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
[bwh: Backported to 3.2: sys_getppid() is used by audit_exit() but not
audit_log_task_info()]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -473,7 +473,7 @@ static int audit_filter_rules(struct tas
case AUDIT_PPID:
if (ctx) {
if (!ctx->ppid)
- ctx->ppid = sys_getppid();
+ ctx->ppid = task_ppid_nr(tsk);
result = audit_comparator(ctx->ppid, f->op, f->val);
}
break;
@@ -1335,7 +1335,7 @@ static void audit_log_exit(struct audit_
/* tsk == current */
context->pid = tsk->pid;
if (!context->ppid)
- context->ppid = sys_getppid();
+ context->ppid = task_ppid_nr(tsk);
cred = current_cred();
context->uid = cred->uid;
context->gid = cred->gid;
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