From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Oleg Nesterov <oleg@redhat.com>,
Sylvain ythier Hitier <sylvain.hitier@gmail.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 3.14 02/37] perf: fix perf bug in fork()
Date: Tue, 7 Oct 2014 16:19:19 -0700 [thread overview]
Message-ID: <20141007231827.116581127@linuxfoundation.org> (raw)
In-Reply-To: <20141007231827.043235686@linuxfoundation.org>
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Zijlstra <peterz@infradead.org>
commit 6c72e3501d0d62fc064d3680e5234f3463ec5a86 upstream.
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..
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/events/core.c | 4 +++-
kernel/fork.c | 5 +++--
2 files changed, 6 insertions(+), 3 deletions(-)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7836,8 +7836,10 @@ int perf_event_init_task(struct task_str
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;
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1323,7 +1323,7 @@ static struct task_struct *copy_process(
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 */
retval = copy_semundo(clone_flags, p);
if (retval)
@@ -1522,8 +1522,9 @@ 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_cgroup:
next prev parent reply other threads:[~2014-10-07 23:19 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-07 23:19 [PATCH 3.14 00/37] 3.14.21-stable review Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 01/37] udf: Avoid infinite loop when processing indirect ICBs Greg Kroah-Hartman
2014-10-07 23:19 ` Greg Kroah-Hartman [this message]
2014-10-07 23:19 ` [PATCH 3.14 03/37] mm: migrate: Close race between migration completion and mprotect Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 04/37] cpufreq: integrator: fix integrator_cpufreq_remove return type Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 05/37] md/raid5: disable DISCARD by default due to safety concerns Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 06/37] drm/i915: Flush the PTEs after updating them before suspend Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 07/37] Fix problem recognizing symlinks Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 08/37] init/Kconfig: Fix HAVE_FUTEX_CMPXCHG to not break up the EXPERT menu Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 09/37] ring-buffer: Fix infinite spin in reading buffer Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 10/37] CIFS: Fix SMB2 readdir error handling Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 11/37] hugetlb: ensure hugepage access is denied if hugepages are not supported Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 12/37] mm, thp: move invariant bug check out of loop in __split_huge_page_map Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 13/37] mm: numa: Do not mark PTEs pte_numa when splitting huge pages Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 14/37] media: vb2: fix VBI/poll regression Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 15/37] jiffies: Fix timeval conversion to jiffies Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 16/37] mm: exclude memoryless nodes from zone_reclaim Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 17/37] swap: change swap_info singly-linked list to list_head Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 18/37] lib/plist: add helper functions Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 19/37] lib/plist: add plist_requeue Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 20/37] swap: change swap_list_head to plist, add swap_avail_head Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 21/37] mm, compaction: avoid isolating pinned pages Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 22/37] mm/compaction: disallow high-order page for migration target Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 23/37] mm/compaction: do not call suitable_migration_target() on every page Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 24/37] drbd: fix regression out of mem, failed to invoke fence-peer helper Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 25/37] mm/compaction: change the timing to check to drop the spinlock Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 26/37] mm/compaction: check pageblock suitability once per pageblock Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 27/37] mm/compaction: clean-up code on success of ballon isolation Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 28/37] mm, compaction: determine isolation mode only once Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 29/37] mm, compaction: ignore pageblock skip when manually invoking compaction Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 30/37] mm/readahead.c: fix readahead failure for memoryless NUMA nodes and limit readahead pages Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 31/37] mm: optimize put_mems_allowed() usage Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 32/37] mm/filemap.c: avoid always dirtying mapping->flags on O_DIRECT Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 33/37] mm: vmscan: respect NUMA policy mask when shrinking slab on direct reclaim Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 34/37] mm: vmscan: shrink_slab: rename max_pass -> freeable Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 35/37] vmscan: reclaim_clean_pages_from_list() must use mod_zone_page_state() Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 36/37] mm: per-thread vma caching Greg Kroah-Hartman
2014-10-07 23:19 ` [PATCH 3.14 37/37] mm: dont pointlessly use BUG_ON() for sanity check Greg Kroah-Hartman
2014-10-08 2:48 ` [PATCH 3.14 00/37] 3.14.21-stable review Guenter Roeck
2014-10-08 20:05 ` Shuah Khan
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