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linux/fs/pstore
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Weichen Chen 75b0f71b26 pstore/ram: Fix crash when setting number of cpus to an odd number 
[ Upstream commit d49270a046 ]

When the number of cpu cores is adjusted to 7 or other odd numbers,
the zone size will become an odd number.
The address of the zone will become:
    addr of zone0 = BASE
    addr of zone1 = BASE + zone_size
    addr of zone2 = BASE + zone_size*2
    ...
The address of zone1/3/5/7 will be mapped to non-alignment va.
Eventually crashes will occur when accessing these va.

So, use ALIGN_DOWN() to make sure the zone size is even
to avoid this bug.

Signed-off-by: Weichen Chen <weichen.chen@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Tested-by: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Link: https://lore.kernel.org/r/20230224023632.6840-1-weichen.chen@mediatek.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-02-05 20:12:48 +00:00
..
blk.c pstore/blk: Use "%lu" to format unsigned long 2021-11-21 09:44:19 -08:00
ftrace.c pstore/ftrace: Allow immediate recording 2021-11-18 10:29:52 -08:00
inode.c pstore: Add priv field to pstore_record for backend specific use 2022-06-24 20:40:04 +02:00
internal.h pstore: Move kmsg_bytes default into Kconfig 2020-12-01 12:09:17 -08:00
Kconfig pstore: Make sure CONFIG_PSTORE_PMSG selects CONFIG_RT_MUTEXES 2022-12-31 13:33:08 +01:00
Makefile pstore/blk: Introduce backend for block devices 2020-05-30 10:34:03 -07:00
platform.c pstore/platform: Add check for kstrdup 2023-11-20 11:51:50 +01:00
pmsg.c pstore: Revert pmsg_lock back to a normal mutex 2023-05-11 23:03:27 +09:00
ram.c pstore/ram: Fix crash when setting number of cpus to an odd number 2024-02-05 20:12:48 +00:00
ram_core.c pstore: ram_core: fix possible overflow in persistent_ram_init_ecc() 2024-01-25 15:27:22 -08:00
zone.c pstore/zone: Use GFP_ATOMIC to allocate zone buffer 2023-01-04 11:28:59 +01:00