From: Greg KH <gregkh@linuxfoundation.org>
To: Kang Wenlin <wenlin.kang@windriver.com>
Cc: stable@vger.kernel.org, viro@zeniv.linux.org.uk,
brauner@kernel.org, ebiederm@xmission.com, keescook@chromium.org,
akpm@linux-foundation.org
Subject: Re: [PATCH 6.6.y 0/6] Backported patches to fix selftest tpdir2
Date: Thu, 3 Apr 2025 15:52:53 +0100 [thread overview]
Message-ID: <2025040344-coma-strict-4e8f@gregkh> (raw)
In-Reply-To: <20250402082656.4177277-1-wenlin.kang@windriver.com>
On Wed, Apr 02, 2025 at 04:26:50PM +0800, Kang Wenlin wrote:
> From: Wenlin Kang <wenlin.kang@windriver.com>
>
> The selftest tpdir2 terminated with a 'Segmentation fault' during loading.
>
> root@localhost:~# cd linux-kenel/tools/testing/selftests/arm64/abi && make
> root@localhost:~/linux-kernel/tools/testing/selftests/arm64/abi# ./tpidr2
> Segmentation fault
>
> The cause of this is the __arch_clear_user() failure.
>
> load_elf_binary() [fs/binfmt_elf.c]
> -> if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bes)))
> -> padzero()
> -> clear_user() [arch/arm64/include/asm/uaccess.h]
> -> __arch_clear_user() [arch/arm64/lib/clear_user.S]
>
> For more details, please see:
> https://lore.kernel.org/lkml/1d0342f3-0474-482b-b6db-81ca7820a462@t-8ch.de/T/
This is just a userspace issue (i.e. don't do that, and if you do want
to do that, use a new kernel!)
Why do these changes need to be backported, do you have real users that
are crashing in this way to require these changes?
thanks,
greg k-h
next prev parent reply other threads:[~2025-04-03 14:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-02 8:26 [PATCH 6.6.y 0/6] Backported patches to fix selftest tpdir2 Kang Wenlin
2025-04-02 8:26 ` [PATCH 6.6.y 1/6] binfmt_elf: Support segments with 0 filesz and misaligned starts Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-02 8:26 ` [PATCH 6.6.y 2/6] binfmt_elf: elf_bss no longer used by load_elf_binary() Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-02 8:26 ` [PATCH 6.6.y 3/6] binfmt_elf: Use elf_load() for interpreter Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-02 8:26 ` [PATCH 6.6.y 4/6] binfmt_elf: Use elf_load() for library Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-02 8:26 ` [PATCH 6.6.y 5/6] binfmt_elf: Only report padzero() errors when PROT_WRITE Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-02 8:26 ` [PATCH 6.6.y 6/6] mm: Remove unused vm_brk() Kang Wenlin
2025-04-02 21:25 ` Sasha Levin
2025-04-03 14:52 ` Greg KH [this message]
2025-04-04 7:58 ` [PATCH 6.6.y 0/6] Backported patches to fix selftest tpdir2 Kang Wenlin
2025-04-08 9:06 ` Greg KH
2025-04-08 9:50 ` Wenlin Kang
2025-04-08 9:55 ` Greg KH
2025-04-08 14:39 ` Kang Wenlin
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