[PATCH 0/2] Fix KASAN crash when using KASAN_VMALLOC

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This problem reported by Clement LE GOFFIC manifest when
using CONFIG_KASAN_IN_VMALLOC and VMAP_STACK:
https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@xxxxxxxxxxx/

After some analysis it seems we are missing to sync the
VMALLOC shadow memory in top level PGD to all CPUs.

Add some code to perform this sync, and the bug appears
to go away.

As suggested by Ard, also perform a dummy read from the
shadow memory of the new VMAP_STACK in the low level
assembly.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
Linus Walleij (2):
      ARM: ioremap: Flush PGDs for VMALLOC shadow
      ARM: entry: Do a dummy read from VMAP shadow

 arch/arm/kernel/entry-armv.S | 8 ++++++++
 arch/arm/mm/ioremap.c        | 7 +++++++
 2 files changed, 15 insertions(+)
---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241015-arm-kasan-vmalloc-crash-fcbd51416457

Best regards,
-- 
Linus Walleij <linus.walleij@xxxxxxxxxx>





[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux