From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
mm-commits@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL] MM updates for 6.1-rc1
Date: Tue, 11 Oct 2022 10:24:27 +0200 [thread overview]
Message-ID: <Y0UoO2+NsJjbZtaf@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAHk-=wigZoriP8ZB+V87Jf+EQV=ka6DQe_HCAQmh3Dmus2FFhw@mail.gmail.com>
On Mon, Oct 10, 2022 at 06:20:00PM -0700, Linus Torvalds wrote:
> The other thing I notice from just doing a build is that I now get
>
> vmlinux.o: warning: objtool: kasan_report+0x12: call to
> stackleak_track_stack() with UACCESS enabled
So kasan_report() is already marked as being special; and it does the
mandatory user_access_save() / user_access_restore() things to fix it
up.
But it looks like kasan code itself is now getting instrumented by the
stackleak stuff and that inserts a call outside of the
user_access_save()/restore() thing, and *that* is getting flagged.
Looking at mm/kasan/Makefile it disables a lot of the instrumentation,
but perhaps not enough?
I've not yet tried to reproduce, I'm taking this is allyesconfig or
something glorious like that? LLVM-15 ?
next prev parent reply other threads:[~2022-10-11 8:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-08 20:21 [GIT PULL] MM updates for 6.1-rc1 Andrew Morton
2022-10-11 1:20 ` Linus Torvalds
2022-10-11 8:24 ` Peter Zijlstra [this message]
2022-10-11 17:08 ` Linus Torvalds
2022-10-11 18:44 ` Josh Poimboeuf
2022-10-11 18:59 ` Josh Poimboeuf
2022-10-11 19:05 ` [PATCH] kasan: disable stackleak plugin in report code Josh Poimboeuf
2022-10-11 22:00 ` Linus Torvalds
2022-10-11 9:02 ` [GIT PULL] MM updates for 6.1-rc1 Alexander Potapenko
2022-10-11 17:11 ` Linus Torvalds
2022-10-11 1:23 ` pr-tracker-bot
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