Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow

[PATCH v7 0/6] x86: Improve Minimum Alternate Stack Size · Chang S. Bae <hidden> · 2021-03-16
[PATCH v7 1/6] uapi: Define the aux vector AT_MINSIGSTKSZ · Chang S. Bae <hidden> · 2021-03-16
[PATCH v7 2/6] x86/signal: Introduce helpers to get the maximum signal frame size · Chang S. Bae <hidden> · 2021-03-16
[PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Chang S. Bae <hidden> · 2021-03-16
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <hidden> · 2021-03-16
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Bae, Chang Seok <hidden> · 2021-03-16
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <hidden> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Bae, Chang Seok <hidden> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Andy Lutomirski <luto@kernel.org> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <hidden> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Bae, Chang Seok <hidden> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <hidden> · 2021-03-25
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Andy Lutomirski <luto@kernel.org> · 2021-03-26
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <bp@alien8.de> · 2021-03-26
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Bae, Chang Seok <hidden> · 2021-04-12
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Borislav Petkov <bp@alien8.de> · 2021-04-14
Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow · Andy Lutomirski <luto@kernel.org> · 2021-03-26
[PATCH v7 3/6] x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ · Chang S. Bae <hidden> · 2021-03-16
[PATCH v7 6/6] selftest/x86/signal: Include test cases for validating sigaltstack · Chang S. Bae <hidden> · 2021-03-16
[PATCH v7 4/6] selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available · Chang S. Bae <hidden> · 2021-03-16
Re: [PATCH v7 0/6] x86: Improve Minimum Alternate Stack Size · Ingo Molnar <mingo@kernel.org> · 2021-03-17
Re: [PATCH v7 0/6] x86: Improve Minimum Alternate Stack Size · Ingo Molnar <mingo@kernel.org> · 2021-03-17
Re: [PATCH v7 0/6] x86: Improve Minimum Alternate Stack Size · Len Brown <lenb@kernel.org> · 2021-03-19
Re: [PATCH v7 0/6] x86: Improve Minimum Alternate Stack Size · Ingo Molnar <mingo@kernel.org> · 2021-03-20

From: Andy Lutomirski <luto@kernel.org>
Date: 2021-03-26 05:00:21
Also in: linux-api, lkml

I forgot to mention why I cc'd all you fine Xen folk:

On Thu, Mar 25, 2021 at 11:13 AM Andy Lutomirski [off-list ref] wrote:

quoted

        } else if (IS_ENABLED(CONFIG_X86_32) &&
                   !onsigstack &&
                   regs->ss != __USER_DS &&

This bit here seems really dubious on Xen PV.  Honestly it seems
dubious everywhere, but especially on Xen PV.

--Andy

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