On Fri, Oct 18, 2019 at 09:52:31AM -0700, Shakeel Butt wrote: > __mem_cgroup_free() can be called on the failure path in > mem_cgroup_alloc(). However memcg_flush_percpu_vmstats() and > memcg_flush_percpu_vmevents() which are called from __mem_cgroup_free() > access the fields of memcg which can potentially be null if called from > failure path from mem_cgroup_alloc(). Indeed syzbot has reported the > following crash: > > R13: 00000000004bf27d R14: 00000000004db028 R15: 0000000000000003 > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 30393 Comm: syz-executor.1 Not tainted 5.4.0-rc2+ #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:memcg_flush_percpu_vmstats+0x4ae/0x930 mm/memcontrol.c:3436 > Code: 05 41 89 c0 41 0f b6 04 24 41 38 c7 7c 08 84 c0 0f 85 5d 03 00 00 > 44 3b 05 33 d5 12 08 0f 83 e2 00 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 > 0f 85 91 03 00 00 48 8b 85 10 fe ff ff 48 8b b0 90 > RSP: 0018:ffff888095c27980 EFLAGS: 00010206 > RAX: 0000000000000012 RBX: ffff888095c27b28 RCX: ffffc90008192000 > RDX: 0000000000040000 RSI: ffffffff8340fae7 RDI: 0000000000000007 > RBP: ffff888095c27be0 R08: 0000000000000000 R09: ffffed1013f0da33 > R10: ffffed1013f0da32 R11: ffff88809f86d197 R12: fffffbfff138b760 > R13: dffffc0000000000 R14: 0000000000000090 R15: 0000000000000007 > FS: 00007f5027170700(0000) GS:ffff8880ae800000(0000) > knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000710158 CR3: 00000000a7b18000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __mem_cgroup_free+0x1a/0x190 mm/memcontrol.c:5021 > mem_cgroup_free mm/memcontrol.c:5033 [inline] > mem_cgroup_css_alloc+0x3a1/0x1ae0 mm/memcontrol.c:5160 > css_create kernel/cgroup/cgroup.c:5156 [inline] > cgroup_apply_control_enable+0x44d/0xc40 kernel/cgroup/cgroup.c:3119 > cgroup_mkdir+0x899/0x11b0 kernel/cgroup/cgroup.c:5401 > kernfs_iop_mkdir+0x14d/0x1d0 fs/kernfs/dir.c:1124 > vfs_mkdir+0x42e/0x670 fs/namei.c:3807 > do_mkdirat+0x234/0x2a0 fs/namei.c:3830 > __do_sys_mkdir fs/namei.c:3846 [inline] > __se_sys_mkdir fs/namei.c:3844 [inline] > __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3844 > do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x459a59 > Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 > f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff > ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f502716fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 > RAX: ffffffffffffffda RBX: 00007f502716fc90 RCX: 0000000000459a59 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 > RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f50271706d4 > R13: 00000000004bf27d R14: 00000000004db028 R15: 0000000000000003 > > Fixing this by moving the flush to mem_cgroup_free as there is no need > to flush anything if we see failure in mem_cgroup_alloc(). > > Reported-by: [email protected] > Fixes: bb65f89b7d3d ("mm: memcontrol: flush percpu vmevents before releasing > memcg") > Fixes: c350a99ea2b1 ("mm: memcontrol: flush percpu vmstats before releasing > memcg") > Signed-off-by: Shakeel Butt <[email protected]> > Cc: Roman Gushchin <[email protected]> > Cc: Michal Hocko <[email protected]> > Cc: Johannes Weiner <[email protected]> > Cc: Vladimir Davydov <[email protected]> > Cc: <[email protected]> > Cc: Andrew Morton <[email protected]> > > --- > mm/memcontrol.c | 12 ++++++------ > 1 file changed, 6 insertions(+), 6 deletions(-) > > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index bdac56009a38..13cb4c1e9f2a 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -5014,12 +5014,6 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg) > { > int node; > > - /* > - * Flush percpu vmstats and vmevents to guarantee the value correctness > - * on parent's and all ancestor levels. > - */ > - memcg_flush_percpu_vmstats(memcg, false); > - memcg_flush_percpu_vmevents(memcg); > for_each_node(node) > free_mem_cgroup_per_node_info(memcg, node); > free_percpu(memcg->vmstats_percpu); > @@ -5030,6 +5024,12 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg) > static void mem_cgroup_free(struct mem_cgroup *memcg) > { > memcg_wb_domain_exit(memcg); > + /* > + * Flush percpu vmstats and vmevents to guarantee the value correctness > + * on parent's and all ancestor levels. > + */ > + memcg_flush_percpu_vmstats(memcg, false); > + memcg_flush_percpu_vmevents(memcg); > __mem_cgroup_free(memcg); > }
Good catch! Reviewed-by: Roman Gushchin <[email protected]> Thank you, Shakeel!
