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author | Shuai Xue <xueshuai@linux.alibaba.com> | 2023-09-07 08:43:07 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 16:46:30 +0000 |
commit | 8c504f615d7ed60ae035c51d0c789137ced6797f (patch) | |
tree | eb4ce2fb8f10e99f227de3e629e41684d9f59c0c /sound/atmel | |
parent | d8267cabbe1bed15ccf8b0e684c528bf8eeef715 (diff) | |
download | linux-stable-8c504f615d7ed60ae035c51d0c789137ced6797f.tar.gz linux-stable-8c504f615d7ed60ae035c51d0c789137ced6797f.tar.bz2 linux-stable-8c504f615d7ed60ae035c51d0c789137ced6797f.zip |
perf/core: Bail out early if the request AUX area is out of bound
[ Upstream commit 54aee5f15b83437f23b2b2469bcf21bdd9823916 ]
When perf-record with a large AUX area, e.g 4GB, it fails with:
#perf record -C 0 -m ,4G -e arm_spe_0// -- sleep 1
failed to mmap with 12 (Cannot allocate memory)
and it reveals a WARNING with __alloc_pages():
------------[ cut here ]------------
WARNING: CPU: 44 PID: 17573 at mm/page_alloc.c:5568 __alloc_pages+0x1ec/0x248
Call trace:
__alloc_pages+0x1ec/0x248
__kmalloc_large_node+0xc0/0x1f8
__kmalloc_node+0x134/0x1e8
rb_alloc_aux+0xe0/0x298
perf_mmap+0x440/0x660
mmap_region+0x308/0x8a8
do_mmap+0x3c0/0x528
vm_mmap_pgoff+0xf4/0x1b8
ksys_mmap_pgoff+0x18c/0x218
__arm64_sys_mmap+0x38/0x58
invoke_syscall+0x50/0x128
el0_svc_common.constprop.0+0x58/0x188
do_el0_svc+0x34/0x50
el0_svc+0x34/0x108
el0t_64_sync_handler+0xb8/0xc0
el0t_64_sync+0x1a4/0x1a8
'rb->aux_pages' allocated by kcalloc() is a pointer array which is used to
maintains AUX trace pages. The allocated page for this array is physically
contiguous (and virtually contiguous) with an order of 0..MAX_ORDER. If the
size of pointer array crosses the limitation set by MAX_ORDER, it reveals a
WARNING.
So bail out early with -ENOMEM if the request AUX area is out of bound,
e.g.:
#perf record -C 0 -m ,4G -e arm_spe_0// -- sleep 1
failed to mmap with 12 (Cannot allocate memory)
Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'sound/atmel')
0 files changed, 0 insertions, 0 deletions