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From: Kees Cook <keescook@chromium.org>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Linux Next Mailing List <linux-next@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: linux-next: Tree for May 14 (objtool 2/2)
Date: Thu, 28 May 2020 23:06:32 -0700	[thread overview]
Message-ID: <202005282258.94570AF@keescook> (raw)
In-Reply-To: <20200528154404.74sjv4bdj3myacn6@treble>

On Thu, May 28, 2020 at 10:44:04AM -0500, Josh Poimboeuf wrote:
> On Thu, May 14, 2020 at 09:04:36AM -0700, Randy Dunlap wrote:
> > On 5/14/20 4:07 AM, Stephen Rothwell wrote:
> > > Hi all,
> > > 
> > > Changes since 20200512:
> > > 
> > 
> > on x86_64:
> > 
> > drivers/ide/ide-tape.o: warning: objtool: ide_tape_discard_merge_buffer.constprop.7()+0x4e: unreachable instruction
> > drivers/scsi/sd.o: warning: objtool: sd_pr_clear()+0x1e: unreachable instruction
> > drivers/scsi/sd_zbc.o: warning: objtool: sd_zbc_update_wp_offset_workfn()+0xec: unreachable instruction
> > drivers/target/target_core_xcopy.o: warning: objtool: target_xcopy_do_work()+0xdd6: unreachable instruction
> > 
> > 
> > randconfig file is attached.
> 
> Kees,
> 
> More UBSAN_TRAP fun.  This randconfig has:
> 
> CONFIG_UBSAN_TRAP=y
> CONFIG_UBSAN_ALIGNMENT=y
> # CONFIG_COMPILE_TEST is not set

Ugh, I thought CONFIG_COMPILE_TEST always gets set for randconfig and
the all*config choices, but now I see that CONFIG_COMPILE_TEST is
enabled due to the "all" part of the all*config choices. Okay. Big
hammer:

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 929211039bac..27bcc2568c95 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -63,7 +63,7 @@ config UBSAN_SANITIZE_ALL
 config UBSAN_ALIGNMENT
        bool "Enable checks for pointers alignment"
        default !HAVE_EFFICIENT_UNALIGNED_ACCESS
-       depends on !X86 || !COMPILE_TEST
+       depends on !UBSAN_TRAP
        help
          This option enables the check of unaligned memory accesses.
          Enabling this option on architectures that support unaligned

How about that?

-- 
Kees Cook

  reply	other threads:[~2020-05-29  6:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-14 11:07 linux-next: Tree for May 14 Stephen Rothwell
2020-05-14 16:04 ` linux-next: Tree for May 14 (objtool 1/2) Randy Dunlap
2020-05-14 16:04 ` linux-next: Tree for May 14 (objtool 2/2) Randy Dunlap
2020-05-28 15:44   ` Josh Poimboeuf
2020-05-29  6:06     ` Kees Cook [this message]
2020-05-29 16:20       ` Randy Dunlap
2020-05-29 17:54       ` Josh Poimboeuf
2020-05-29 19:30         ` Kees Cook

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