Re: [PATCH v2] arm64: syscall: Ensure saved x0 is kept in-sync with tracer updates

[Will Deacon]

On Thu, 16 Jul 2026 13:06:39 +0100, Will Deacon wrote:
> When seccomp support was originally added to arm64 in a1ae65b21941
> ("arm64: add seccomp support"), seccomp was erroneously called _before_
> the ptrace syscall-enter-stop and therefore the tracer could trivially
> manipulate the syscall register state after the seccomp check had
> passed. This was subsequently fixed in a5cd110cb836 ("arm64/ptrace: run
> seccomp after ptrace") by moving the seccomp check after the tracer has
> run. Unfortunately, a decade later, that fix has been reported to be
> incomplete.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: syscall: Ensure saved x0 is kept in-sync with tracer updates
      https://git.kernel.org/arm64/c/e057b9477232

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
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