Revision 72cd652b73dd77df6f26bd450e804ee29232669f authored by Athira Rajeev on 05 September 2022, 14:19:28 UTC, committed by Arnaldo Carvalho de Melo on 06 September 2022, 12:45:23 UTC
The affinity code in "affinity_set" function access array named "sched_cpus". The size for this array is allocated in affinity_setup function which is nothing but value from get_cpu_set_size. This is used to contain the cpumask value for each cpu. While setting bit for each cpu, it calls "set_bit" function which access index in sched_cpus array. If we provide a command-line option to -C which is more than the number of CPU's present in the system, the set_bit could access an array member which is out-of the array size. This is because currently, there is no boundary check for the CPU. This will result in seg fault: <<>> ./perf stat -C 12323431 ls Perf can support 2048 CPUs. Consider raising MAX_NR_CPUS Segmentation fault (core dumped) <<>> Fix this by adding boundary check for the array. After the fix from powerpc system: <<>> ./perf stat -C 12323431 ls 1>out Perf can support 2048 CPUs. Consider raising MAX_NR_CPUS Performance counter stats for 'CPU(s) 12323431': <not supported> msec cpu-clock <not supported> context-switches <not supported> cpu-migrations <not supported> page-faults <not supported> cycles <not supported> instructions <not supported> branches <not supported> branch-misses 0.001192373 seconds time elapsed <<>> Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com> Signed-off-by: Athira Jajeev <atrajeev@linux.vnet.ibm.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20220905141929.7171-1-atrajeev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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damon | ||
kasan | ||
kfence | ||
Kconfig | -rw-r--r-- | 34.9 KB |
Kconfig.debug | -rw-r--r-- | 7.7 KB |
Makefile | -rw-r--r-- | 4.9 KB |
backing-dev.c | -rw-r--r-- | 24.7 KB |
balloon_compaction.c | -rw-r--r-- | 8.2 KB |
bootmem_info.c | -rw-r--r-- | 3.4 KB |
cma.c | -rw-r--r-- | 15.5 KB |
cma.h | -rw-r--r-- | 1.4 KB |
cma_debug.c | -rw-r--r-- | 4.5 KB |
cma_sysfs.c | -rw-r--r-- | 2.4 KB |
compaction.c | -rw-r--r-- | 84.1 KB |
debug.c | -rw-r--r-- | 6.8 KB |
debug_page_ref.c | -rw-r--r-- | 1.4 KB |
debug_vm_pgtable.c | -rw-r--r-- | 38.8 KB |
dmapool.c | -rw-r--r-- | 13.6 KB |
early_ioremap.c | -rw-r--r-- | 6.7 KB |
fadvise.c | -rw-r--r-- | 5.5 KB |
failslab.c | -rw-r--r-- | 1.4 KB |
filemap.c | -rw-r--r-- | 110.7 KB |
folio-compat.c | -rw-r--r-- | 3.3 KB |
frontswap.c | -rw-r--r-- | 7.9 KB |
gup.c | -rw-r--r-- | 90.6 KB |
gup_test.c | -rw-r--r-- | 5.6 KB |
gup_test.h | -rw-r--r-- | 938 bytes |
highmem.c | -rw-r--r-- | 19.5 KB |
hmm.c | -rw-r--r-- | 16.7 KB |
huge_memory.c | -rw-r--r-- | 86.2 KB |
hugetlb.c | -rw-r--r-- | 201.1 KB |
hugetlb_cgroup.c | -rw-r--r-- | 24.6 KB |
hugetlb_vmemmap.c | -rw-r--r-- | 15.8 KB |
hugetlb_vmemmap.h | -rw-r--r-- | 1.6 KB |
hwpoison-inject.c | -rw-r--r-- | 2.7 KB |
init-mm.c | -rw-r--r-- | 1.6 KB |
internal.h | -rw-r--r-- | 27.6 KB |
interval_tree.c | -rw-r--r-- | 3.1 KB |
io-mapping.c | -rw-r--r-- | 993 bytes |
ioremap.c | -rw-r--r-- | 1.4 KB |
khugepaged.c | -rw-r--r-- | 59.1 KB |
kmemleak.c | -rw-r--r-- | 59.9 KB |
ksm.c | -rw-r--r-- | 89.2 KB |
list_lru.c | -rw-r--r-- | 13.8 KB |
maccess.c | -rw-r--r-- | 5.8 KB |
madvise.c | -rw-r--r-- | 37.6 KB |
mapping_dirty_helpers.c | -rw-r--r-- | 10.5 KB |
memblock.c | -rw-r--r-- | 61.1 KB |
memcontrol.c | -rw-r--r-- | 197.8 KB |
memfd.c | -rw-r--r-- | 8.2 KB |
memory-failure.c | -rw-r--r-- | 68.3 KB |
memory.c | -rw-r--r-- | 158.3 KB |
memory_hotplug.c | -rw-r--r-- | 64.0 KB |
mempolicy.c | -rw-r--r-- | 77.8 KB |
mempool.c | -rw-r--r-- | 15.8 KB |
memremap.c | -rw-r--r-- | 14.4 KB |
memtest.c | -rw-r--r-- | 2.8 KB |
migrate.c | -rw-r--r-- | 68.4 KB |
migrate_device.c | -rw-r--r-- | 23.4 KB |
mincore.c | -rw-r--r-- | 7.1 KB |
mlock.c | -rw-r--r-- | 19.0 KB |
mm_init.c | -rw-r--r-- | 5.3 KB |
mmap.c | -rw-r--r-- | 100.4 KB |
mmap_lock.c | -rw-r--r-- | 6.2 KB |
mmu_gather.c | -rw-r--r-- | 8.8 KB |
mmu_notifier.c | -rw-r--r-- | 35.3 KB |
mmzone.c | -rw-r--r-- | 2.5 KB |
mprotect.c | -rw-r--r-- | 22.3 KB |
mremap.c | -rw-r--r-- | 28.1 KB |
msync.c | -rw-r--r-- | 2.8 KB |
nommu.c | -rw-r--r-- | 44.4 KB |
oom_kill.c | -rw-r--r-- | 33.5 KB |
page-writeback.c | -rw-r--r-- | 93.0 KB |
page_alloc.c | -rw-r--r-- | 267.8 KB |
page_counter.c | -rw-r--r-- | 6.7 KB |
page_ext.c | -rw-r--r-- | 11.2 KB |
page_idle.c | -rw-r--r-- | 5.2 KB |
page_io.c | -rw-r--r-- | 12.7 KB |
page_isolation.c | -rw-r--r-- | 20.7 KB |
page_owner.c | -rw-r--r-- | 16.9 KB |
page_poison.c | -rw-r--r-- | 2.5 KB |
page_reporting.c | -rw-r--r-- | 10.3 KB |
page_reporting.h | -rw-r--r-- | 1.6 KB |
page_table_check.c | -rw-r--r-- | 5.8 KB |
page_vma_mapped.c | -rw-r--r-- | 8.6 KB |
pagewalk.c | -rw-r--r-- | 15.5 KB |
percpu-internal.h | -rw-r--r-- | 7.0 KB |
percpu-km.c | -rw-r--r-- | 3.2 KB |
percpu-stats.c | -rw-r--r-- | 5.8 KB |
percpu-vm.c | -rw-r--r-- | 11.7 KB |
percpu.c | -rw-r--r-- | 102.5 KB |
pgalloc-track.h | -rw-r--r-- | 1.3 KB |
pgtable-generic.c | -rw-r--r-- | 5.8 KB |
process_vm_access.c | -rw-r--r-- | 8.2 KB |
ptdump.c | -rw-r--r-- | 4.2 KB |
readahead.c | -rw-r--r-- | 25.3 KB |
rmap.c | -rw-r--r-- | 72.7 KB |
rodata_test.c | -rw-r--r-- | 1.3 KB |
secretmem.c | -rw-r--r-- | 6.4 KB |
shmem.c | -rw-r--r-- | 110.6 KB |
shrinker_debug.c | -rw-r--r-- | 6.2 KB |
shuffle.c | -rw-r--r-- | 4.7 KB |
shuffle.h | -rw-r--r-- | 1.2 KB |
slab.c | -rw-r--r-- | 105.6 KB |
slab.h | -rw-r--r-- | 22.4 KB |
slab_common.c | -rw-r--r-- | 32.7 KB |
slob.c | -rw-r--r-- | 18.8 KB |
slub.c | -rw-r--r-- | 154.9 KB |
sparse-vmemmap.c | -rw-r--r-- | 10.2 KB |
sparse.c | -rw-r--r-- | 25.6 KB |
swap.c | -rw-r--r-- | 30.3 KB |
swap.h | -rw-r--r-- | 4.0 KB |
swap_cgroup.c | -rw-r--r-- | 5.1 KB |
swap_slots.c | -rw-r--r-- | 9.2 KB |
swap_state.c | -rw-r--r-- | 23.9 KB |
swapfile.c | -rw-r--r-- | 92.2 KB |
truncate.c | -rw-r--r-- | 26.2 KB |
usercopy.c | -rw-r--r-- | 8.1 KB |
userfaultfd.c | -rw-r--r-- | 18.8 KB |
util.c | -rw-r--r-- | 30.5 KB |
vmacache.c | -rw-r--r-- | 2.7 KB |
vmalloc.c | -rw-r--r-- | 107.5 KB |
vmpressure.c | -rw-r--r-- | 13.9 KB |
vmscan.c | -rw-r--r-- | 139.4 KB |
vmstat.c | -rw-r--r-- | 55.1 KB |
workingset.c | -rw-r--r-- | 21.8 KB |
z3fold.c | -rw-r--r-- | 44.6 KB |
zbud.c | -rw-r--r-- | 18.4 KB |
zpool.c | -rw-r--r-- | 11.2 KB |
zsmalloc.c | -rw-r--r-- | 57.0 KB |
zswap.c | -rw-r--r-- | 39.9 KB |
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