Sergey Senozhatsky e1a55bde7f zsmalloc: calling zs_map_object() from irq is a bug ... [ Upstream commit 1aedcafbf32b3f232c159b14cd0d423fcfe2b861 ] Use BUG_ON(in_interrupt()) in zs_map_object(). This is not a new BUG_ON(), it's always been there, but was recently changed to VM_BUG_ON(). There are several problems there. First, we use use per-CPU mappings both in zsmalloc and in zram, and interrupt may easily corrupt those buffers. Second, and more importantly, we believe it's possible to start leaking sensitive information. Consider the following case: -> process P swap out zram per-cpu mapping CPU1 compress page A -> IRQ swap out zram per-cpu mapping CPU1 compress page B write page from per-cpu mapping CPU1 to zsmalloc pool iret -> process P write page from per-cpu mapping CPU1 to zsmalloc pool [*] return * so we store overwritten data that actually belongs to another page (task) and potentially contains sensitive data. And when process P will page fault it's going to read (swap in) that other task's data. Link: http://lkml.kernel.org/r/20170929045140.4055-1-sergey.senozhatsky@gmail.com Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-08-19 11:34:39 +05:30
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kasan
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c
debug-pagealloc.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c
frame_vector.c
frontswap.c
gup.c	mm: prevent get_user_pages() from overflowing page refcount	2020-04-07 14:08:50 +02:00
highmem.c
hpa.c
huge_memory.c
hugetlb_cgroup.c
hugetlb.c	mm: prevent get_user_pages() from overflowing page refcount	2020-04-07 14:08:50 +02:00
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
io_record.c
Kconfig
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c	memcg: fix NULL pointer dereference in __mem_cgroup_usage_unregister_event	2020-04-07 14:14:28 +02:00
memory_hotplug.c
memory-failure.c
memory.c
mempolicy.c
mempool.c
memtest.c
migrate.c
mincore.c
mlock.c
mm_init.c
mmap.c
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c	x86/mm: split vmalloc_sync_all()	2020-04-07 14:14:34 +02:00
oom_kill.c
page_alloc.c
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
shmem.c
showmem_extra.c
slab_common.c
slab.c
slab.h
slob.c
slub.c	mm, slub: prevent kmalloc_node crashes and memory leaks	2020-04-07 14:14:32 +02:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_state.c
swap.c
swapfile.c
truncate.c
usercopy.c
userfaultfd.c
util.c
vmacache.c
vmalloc.c	x86/mm: split vmalloc_sync_all()	2020-04-07 14:14:34 +02:00
vmpressure.c
vmscan.c
vmstat.c	mm: add NR_ZSMALLOC to vmstat	2020-08-19 11:34:38 +05:30
workingset.c
zbud.c
zpool.c
zsmalloc.c	zsmalloc: calling zs_map_object() from irq is a bug	2020-08-19 11:34:39 +05:30
zswap.c	mm, zram: Use zstd as initial compressor	2020-08-19 11:34:37 +05:30