From: Sohil Mehta <sohil.mehta@intel.com>
To: Hou Tao <houtao@huaweicloud.com>, <x86@kernel.org>,
<bpf@vger.kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H . Peter Anvin" <hpa@zytor.com>, <linux-kernel@vger.kernel.org>,
xingwei lee <xrivendell7@gmail.com>,
"Jann Horn" <jannh@google.com>, <houtao1@huawei.com>
Subject: Re: [PATCH bpf 3/3] selftest/bpf: Test the read of vsyscall page under x86-64
Date: Mon, 22 Jan 2024 16:25:58 -0800 [thread overview]
Message-ID: <1c260ab1-d4c0-48e6-bf2b-df69bf083d27@intel.com> (raw)
In-Reply-To: <20240119073019.1528573-4-houtao@huaweicloud.com>
On 1/18/2024 11:30 PM, Hou Tao wrote:
> vsyscall page could be disabled by CONFIG_LEGACY_VSYSCALL_NONE or
> vsyscall=none boot cmd-line, but it doesn't affect the reproduce of the
> problem and the returned error codes.
>
With vsyscall=emulate a direct read of the vsyscall address from
userspace is expected to go through. This is mode deprecated so maybe it
wouldn't matter much. Without the fix in patch 2/3, do you see the same
behavior with vsyscall=emulate set in the cmdline?
Sohil
next prev parent reply other threads:[~2024-01-23 0:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-19 7:30 [PATCH bpf 0/3] Fix the read of vsyscall page through bpf Hou Tao
2024-01-19 7:30 ` [PATCH bpf 1/3] x86/mm: Move is_vsyscall_vaddr() into mm_internal.h Hou Tao
2024-01-20 0:35 ` Sohil Mehta
2024-01-20 1:29 ` Hou Tao
2024-01-19 7:30 ` [PATCH bpf 2/3] x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() Hou Tao
2024-01-23 0:18 ` Sohil Mehta
2024-01-25 7:18 ` Hou Tao
2024-01-19 7:30 ` [PATCH bpf 3/3] selftest/bpf: Test the read of vsyscall page under x86-64 Hou Tao
2024-01-22 6:30 ` Yonghong Song
2024-01-25 6:37 ` Hou Tao
2024-01-23 0:25 ` Sohil Mehta [this message]
2024-01-25 7:54 ` Hou Tao
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