ARM: 9429/1: ioremap: Sync PGDs for VMALLOC shadow

Browse source

commit d6e6a74d4c upstream.

When sync:ing the VMALLOC area to other CPUs, make sure to also
sync the KASAN shadow memory for the VMALLOC area, so that we
don't get stale entries for the shadow memory in the top level PGD.

Since we are now copying PGDs in two instances, create a helper
function named memcpy_pgd() to do the actual copying, and
create a helper to map the addresses of VMALLOC_START and
VMALLOC_END into the corresponding shadow memory.

Co-developed-by: Melon Liu <melon1335@163.com>

Cc: stable@vger.kernel.org
Fixes: 565cbaad83 ("ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC")
Link: https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@foss.st.com/
Reported-by: Clement LE GOFFIC <clement.legoffic@foss.st.com>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Suggested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Linus Walleij 2024-10-23 13:03:14 +01:00 • committed by Greg Kroah-Hartman

parent 7e3a8ea3d1

commit 1359fd9eae

1 changed files with 29 additions and 4 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

33

arch/arm/mm/ioremap.c

View file