On Mon, 27 Apr 2026 13:03:32 +0100, Kevin Brodsky wrote:
> Commit 2e8a1acea859 ("arm64: signal: Improve POR_EL0 handling to
> avoid uaccess failures") introduced special handling for EL0 registers
> that impact uaccess. This did not however handle the case where a signal
> handler removes the relevant record (poe_context for POE) from the
> signal frame; this is clearly not typical behaviour but it is legal.
> That commit resulted in arbitrary data from the kernel stack being
> written to POR_EL0 in that case.
>
> [...]
Applied selftest updates to arm64 (for-next/selftests), thanks!
[2/5] selftests/mm: Fix resv_sz when parsing arm64 signal frame
https://git.kernel.org/arm64/c/c364aa56d673
[3/5] kselftest/arm64: Add POE as a feature in the signal tests
https://git.kernel.org/arm64/c/42c21954063e
[4/5] kselftest/arm64: Move/add POE helpers to test_signals_utils.h
https://git.kernel.org/arm64/c/925a082ec2a0
[5/5] kselftest/arm64: Add tests for POR_EL0 save/reset/restore
https://git.kernel.org/arm64/c/f2db075234c8
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
