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| author | Will Deacon <will@kernel.org> | 2021-06-08 21:02:55 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-06-11 15:25:40 +0300 |
| commit | 2122a833316f2f3f6ddc78429fa67ef6d3c86636 (patch) | |
| tree | a95ac214b398b4dd7f46e1f8aca026e84056a233 /arch/arm64/tools | |
| parent | 930a58b4093ebd2a036a0d448a2047477ef90d26 (diff) | |
| download | linux-2122a833316f2f3f6ddc78429fa67ef6d3c86636.tar.xz | |
arm64: Allow mismatched 32-bit EL0 support
When confronted with a mixture of CPUs, some of which support 32-bit
applications and others which don't, we quite sensibly treat the system
as 64-bit only for userspace and prevent execve() of 32-bit binaries.
Unfortunately, some crazy folks have decided to build systems like this
with the intention of running 32-bit applications, so relax our
sanitisation logic to continue to advertise 32-bit support to userspace
on these systems and track the real 32-bit capable cores in a cpumask
instead. For now, the default behaviour remains but will be tied to
a command-line option in a later patch.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210608180313.11502-3-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/tools')
| -rw-r--r-- | arch/arm64/tools/cpucaps | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 21fbdda7086e..49305c2e6dfd 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -3,7 +3,8 @@ # Internal CPU capabilities constants, keep this list sorted BTI -HAS_32BIT_EL0 +# Unreliable: use system_supports_32bit_el0() instead. +HAS_32BIT_EL0_DO_NOT_USE HAS_32BIT_EL1 HAS_ADDRESS_AUTH HAS_ADDRESS_AUTH_ARCH |