From: Nathan Chancellor <nathan@kernel.org>
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Petr Pavlu <petr.pavlu@suse.com>,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, hpa@zytor.com,
samitolvanen@google.com, x86@kernel.org,
linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, ndesaulniers@google.com
Subject: Re: [RFC PATCH 0/2] x86: kprobes: Fix CFI_CLANG related issues
Date: Mon, 10 Jul 2023 08:57:03 -0700 [thread overview]
Message-ID: <20230710155703.GA4021842@dev-arch.thelio-3990X> (raw)
In-Reply-To: <168899125356.80889.17967397360941194229.stgit@devnote2>
On Mon, Jul 10, 2023 at 09:14:13PM +0900, Masami Hiramatsu (Google) wrote:
> I just build tested, since I could not boot the kernel with CFI_CLANG=y.
> Would anyone know something about this error?
>
> [ 0.141030] MMIO Stale Data: Unknown: No mitigations
> [ 0.153511] SMP alternatives: Using kCFI
> [ 0.164593] Freeing SMP alternatives memory: 36K
> [ 0.165053] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_kernel+0x472/0x48b
> [ 0.166028] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.2-00002-g12b1b2fca8ef #126
> [ 0.166028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
> [ 0.166028] Call Trace:
> [ 0.166028] <TASK>
> [ 0.166028] dump_stack_lvl+0x6e/0xb0
> [ 0.166028] panic+0x146/0x2f0
> [ 0.166028] ? start_kernel+0x472/0x48b
> [ 0.166028] __stack_chk_fail+0x14/0x20
> [ 0.166028] start_kernel+0x472/0x48b
> [ 0.166028] x86_64_start_reservations+0x24/0x30
> [ 0.166028] x86_64_start_kernel+0xa6/0xbb
> [ 0.166028] secondary_startup_64_no_verify+0x106/0x11b
> [ 0.166028] </TASK>
> [ 0.166028] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_kernel+0x472/0x48b ]---
This looks like https://github.com/ClangBuiltLinux/linux/issues/1815 to
me. What version of LLVM are you using? This was fixed in 16.0.4. Commit
514ca14ed544 ("start_kernel: Add __no_stack_protector function
attribute") should resolve it on the Linux side, it looks like that is
in 6.5-rc1. Not sure if we should backport it or just let people upgrade
their toolchains on older releases.
Cheers,
Nathan
next prev parent reply other threads:[~2023-07-10 15:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-10 12:14 [RFC PATCH 0/2] x86: kprobes: Fix CFI_CLANG related issues Masami Hiramatsu (Google)
2023-07-10 12:14 ` [RFC PATCH 1/2] kprobes: Prohibit probing on CFI preamble symbol Masami Hiramatsu (Google)
2023-07-10 15:37 ` Peter Zijlstra
2023-07-10 23:50 ` Masami Hiramatsu
2023-07-10 12:14 ` [RFC PATCH 2/2] x86/kprobes: Prohibit probing on compiler generated CFI checking code Masami Hiramatsu (Google)
2023-07-10 16:16 ` Peter Zijlstra
2023-07-10 16:21 ` Peter Zijlstra
2023-07-10 23:58 ` Masami Hiramatsu
2023-07-11 7:04 ` Peter Zijlstra
2023-07-11 7:15 ` Peter Zijlstra
2023-07-10 13:46 ` [RFC PATCH 0/2] x86: kprobes: Fix CFI_CLANG related issues Peter Zijlstra
2023-07-10 15:57 ` Nathan Chancellor [this message]
2023-07-11 1:33 ` Masami Hiramatsu
2023-07-11 18:37 ` Nathan Chancellor
2023-07-11 19:54 ` Greg Kroah-Hartman
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