linux-kernel - [tip:perf/urgent] perf: Fix perf bug in fork()

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Message-ID: <tip-9c2b9d30e28559a78c9e431cdd7f2c6bf5a9ee67@git.kernel.org>
Date:	Thu, 2 Oct 2014 22:27:13 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, acme@...nel.org, atomlin@...hat.com,
	riel@...hat.com, akpm@...ux-foundation.org,
	sylvain.hitier@...il.com, tglx@...utronix.de, oleg@...hat.com,
	vdavydov@...allels.com, rientjes@...gle.com,
	linux-kernel@...r.kernel.org, hpa@...or.com, paulus@...ba.org,
	daeseok.youn@...il.com, stable@...r.kernel.org,
	keescook@...omium.org
Subject: [tip:perf/urgent] perf: Fix perf bug in fork()

Commit-ID:  9c2b9d30e28559a78c9e431cdd7f2c6bf5a9ee67
Gitweb:     http://git.kernel.org/tip/9c2b9d30e28559a78c9e431cdd7f2c6bf5a9ee67
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Mon, 29 Sep 2014 12:12:01 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 3 Oct 2014 05:41:08 +0200

perf: Fix perf bug in fork()

Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by
calling perf_event_free_task() when failing sched_fork() we will not yet
have done the memset() on ->perf_event_ctxp[] and will therefore try and
'free' the inherited contexts, which are still in use by the parent
process.

This is bad and might explain some outstanding fuzzer failures ...

Suggested-by: Oleg Nesterov <oleg@...hat.com>
Reported-by: Oleg Nesterov <oleg@...hat.com>
Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Aaron Tomlin <atomlin@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Daeseok Youn <daeseok.youn@...il.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Vladimir Davydov <vdavydov@...allels.com>
Cc: <stable@...r.kernel.org>
Link: http://lkml.kernel.org/r/20140929101201.GE5430@worktop
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 4 +++-
 kernel/fork.c        | 5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index afdd9e1..658f232 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7956,8 +7956,10 @@ int perf_event_init_task(struct task_struct *child)
 
 	for_each_task_context_nr(ctxn) {
 		ret = perf_event_init_context(child, ctxn);
-		if (ret)
+		if (ret) {
+			perf_event_free_task(child);
 			return ret;
+		}
 	}
 
 	return 0;
diff --git a/kernel/fork.c b/kernel/fork.c
index 0cf9cdb..a91e47d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1360,7 +1360,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		goto bad_fork_cleanup_policy;
 	retval = audit_alloc(p);
 	if (retval)
-		goto bad_fork_cleanup_policy;
+		goto bad_fork_cleanup_perf;
 	/* copy all the process information */
 	shm_init_task(p);
 	retval = copy_semundo(clone_flags, p);
@@ -1566,8 +1566,9 @@ bad_fork_cleanup_semundo:
 	exit_sem(p);
 bad_fork_cleanup_audit:
 	audit_free(p);
-bad_fork_cleanup_policy:
+bad_fork_cleanup_perf:
 	perf_event_free_task(p);
+bad_fork_cleanup_policy:
 #ifdef CONFIG_NUMA
 	mpol_put(p->mempolicy);
 bad_fork_cleanup_threadgroup_lock:
--
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