Re: [PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked

[PATCH 0/7] wchan: Fix wchan support · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
[PATCH 3/7] proc: Use task_is_running() for wchan in /proc/$pid/stat · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
[PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Mark Rutland <mark.rutland@arm.com> · 2021-10-08
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Josh Poimboeuf <hidden> · 2021-10-08
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Mark Rutland <mark.rutland@arm.com> · 2021-10-14
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Josh Poimboeuf <hidden> · 2021-10-14
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Mark Rutland <mark.rutland@arm.com> · 2021-10-14
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · Josh Poimboeuf <hidden> · 2021-10-14
Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT · "Russell King (Oracle)" <linux@armlinux.org.uk> · 2021-10-14
[PATCH 4/7] x86: Fix get_wchan() to support the ORC unwinder · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
[PATCH 7/7] arch: Fix STACKTRACE_SUPPORT · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
Re: [PATCH 7/7] arch: Fix STACKTRACE_SUPPORT · Mark Rutland <mark.rutland@arm.com> · 2021-10-08
Re: [PATCH 7/7] arch: Fix STACKTRACE_SUPPORT · Guo Ren <guoren@kernel.org> · 2021-10-09
[PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
Re: [PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked · Geert Uytterhoeven <geert@linux-m68k.org> · 2021-10-08
Re: [PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked · Mark Rutland <mark.rutland@arm.com> · 2021-10-08
Re: [PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked · "Russell King (Oracle)" <linux@armlinux.org.uk> · 2021-10-14
[PATCH 1/7] Revert "proc/wchan: use printk format instead of lookup_symbol_name()" · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
[PATCH 2/7] leaking_addresses: Always print a trailing newline · Peter Zijlstra <peterz@infradead.org> · 2021-10-08
Re: [PATCH 0/7] wchan: Fix wchan support · "Russell King (Oracle)" <linux@armlinux.org.uk> · 2021-10-14
Re: [PATCH 0/7] wchan: Fix wchan support · "Russell King (Oracle)" <linux@armlinux.org.uk> · 2021-10-14
Re: [PATCH 0/7] wchan: Fix wchan support · Josh Poimboeuf <hidden> · 2021-10-14

From: "Russell King (Oracle)" <linux@armlinux.org.uk>
Date: 2021-10-14 10:47:40
Also in: linux-hardening, lkml

On Fri, Oct 08, 2021 at 01:15:32PM +0200, Peter Zijlstra wrote:

From: Kees Cook <redacted>

Having a stable wchan means the process must be blocked and for it to
stay that way while performing stack unwinding.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kees Cook <redacted>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

Acked-by: Russell King (Oracle) <redacted> [arm]

I will eventually get around to test this once I've caught up.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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