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From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
	linux-kernel@vger.kernel.org, sfr@canb.auug.org.au
Subject: Re: objtool warning from next-20230125
Date: Fri, 27 Jan 2023 13:14:47 +0100	[thread overview]
Message-ID: <Y9PAN12SPHuGL99G@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20230126205954.zk3t4fpmxqowfu2d@treble>

On Thu, Jan 26, 2023 at 12:59:54PM -0800, Josh Poimboeuf wrote:
> On Thu, Jan 26, 2023 at 10:23:02AM -0800, Paul E. McKenney wrote:
> > Hello!
> > 
> > I have started seeing these objtool warnings from a wide variety of
> > KASAN-enabled rcutorture-related test scenarios in next-20230125.  It has
> > been awhile since I tested -next, so I am not yet sure where this started.
> > 
> > vmlinux.o: warning: objtool: __asan_memset+0x34: call to __memset() with UACCESS enabled
> > vmlinux.o: warning: objtool: __asan_memmove+0x4d: call to __memmove() with UACCESS enabled
> > vmlinux.o: warning: objtool: __asan_memcpy+0x4d: call to __memcpy() with UACCESS enabled
> > 
> > As usual, should I be worried?
> 
> This apparently came from Peter's
> 
>   69d4c0d32186 ("entry, kasan, x86: Disallow overriding mem*() functions")
> 
> but I have no idea how this is supposed to work.  Peter?

Durr.. I'm not sure why I put them in the uaccess_safe_builtin[] array.

So yeah, this reproduces using defconfig+KASAN, removing the functions
from the array shuts it up and doesn't generate new ones -- for that
config.

Let me try and build a few more .configs...

  parent reply	other threads:[~2023-01-27 12:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-26 18:23 objtool warning from next-20230125 Paul E. McKenney
2023-01-26 20:59 ` Josh Poimboeuf
2023-01-26 23:20   ` Paul E. McKenney
2023-01-27 12:14   ` Peter Zijlstra [this message]
2023-01-27 19:37     ` Paul E. McKenney
2023-02-11 10:30 ` [tip: sched/core] objtool: mem*() are not uaccess safe tip-bot2 for Peter Zijlstra

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