* [GIT PULL] arm64 fixes for 5.15-rc3
@ 2021-09-24 17:40 Catalin Marinas
2021-09-24 18:26 ` pr-tracker-bot
0 siblings, 1 reply; 2+ messages in thread
From: Catalin Marinas @ 2021-09-24 17:40 UTC (permalink / raw)
To: Linus Torvalds; +Cc: Will Deacon, linux-arm-kernel, linux-kernel
Hi Linus,
Please pull the arm64 fixes below. Thanks.
The following changes since commit 9fcb2e93f41c07a400885325e7dbdfceba6efaec:
arm64: Mark __stack_chk_guard as __ro_after_init (2021-09-16 17:59:17 +0100)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux tags/arm64-fixes
for you to fetch changes up to 22b70e6f2da0a4c8b1421b00cfc3016bc9d4d9d4:
arm64: Restore forced disabling of KPTI on ThunderX (2021-09-23 15:59:15 +0100)
----------------------------------------------------------------
arm64 fixes:
- It turns out that the optimised string routines merged in 5.14 are not
safe with in-kernel MTE (KASAN_HW_TAGS) because of reading beyond the
end of a string (strcmp, strncmp). Such reading may go across a 16
byte tag granule and cause a tag check fault. When KASAN_HW_TAGS is
enabled, use the generic strcmp/strncmp C implementation.
- An errata workaround for ThunderX relied on the CPU capabilities being
enabled in a specific order. This disappeared with the automatic
generation of the cpucaps.h file (sorted alphabetically). Fix it by
checking the current CPU only rather than the system-wide capability.
- Add system_supports_mte() checks on the kernel entry/exit path and
thread switching to avoid unnecessary barriers and function calls on
systems where MTE is not supported.
- kselftests: skip arm64 tests if the required features are missing.
----------------------------------------------------------------
Cristian Marussi (1):
kselftest/arm64: signal: Skip tests if required features are missing
Peter Collingbourne (1):
arm64: add MTE supported check to thread switching and syscall entry/exit
Robin Murphy (1):
arm64: Mitigate MTE issues with str{n}cmp()
dann frazier (1):
arm64: Restore forced disabling of KPTI on ThunderX
arch/arm64/include/asm/assembler.h | 5 +++++
arch/arm64/include/asm/mte.h | 6 ++++++
arch/arm64/include/asm/string.h | 2 ++
arch/arm64/kernel/cpufeature.c | 8 ++++++--
arch/arm64/kernel/mte.c | 10 ++++------
arch/arm64/lib/strcmp.S | 2 +-
arch/arm64/lib/strncmp.S | 2 +-
tools/testing/selftests/arm64/signal/test_signals_utils.c | 7 +++++--
8 files changed, 30 insertions(+), 12 deletions(-)
--
Catalin
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [GIT PULL] arm64 fixes for 5.15-rc3
2021-09-24 17:40 [GIT PULL] arm64 fixes for 5.15-rc3 Catalin Marinas
@ 2021-09-24 18:26 ` pr-tracker-bot
0 siblings, 0 replies; 2+ messages in thread
From: pr-tracker-bot @ 2021-09-24 18:26 UTC (permalink / raw)
To: Catalin Marinas
Cc: Linus Torvalds, Will Deacon, linux-arm-kernel, linux-kernel
The pull request you sent on Fri, 24 Sep 2021 18:40:56 +0100:
> git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux tags/arm64-fixes
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/1b7eaf570140281a1aa898a875aa587d48d96958
Thank you!
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