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SubjectRe: [RESEND PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks
[ Re-sending without the corporate footer garbage... ]

On Wed, Sep 05, 2018 at 03:34:41PM +0100, Will Deacon wrote:
>Hi all,
>This is a resend of:
>now based on 4.19-rc2.
>The Debian folks have observed a failure in the 32-bit arm glibc testsuite
>when running under a 64-bit kernel. They tracked this down to sigaltstack(2)
>enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes,
>which is higher for native arm64 tasks than compat 32-bit tasks.
>These patches resolve the issue by allowing an architecture to define
>COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack
>checking code.
>Feedback welcome,

Apologies for the delayed response here - conference travel etc . got
in the way... I've just tested and I can confirm that this patchset
fixes our reported bug (as in Thanks

Tested-by: Steve McIntyre <>

Steve McIntyre <>

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