From: Peter Zijlstra <peterz@infradead.org>
To: ellyndra <ellyesparza8@gmail.com>
Cc: linux-kernel@vger.kernel.org, luto@kernel.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, paul@paul-moore.com,
jmorris@namei.org, serge@hallyn.com
Subject: Re: [PATCH RESEND] kprobes: Blacklist risky functions from being probed
Date: Thu, 4 Dec 2025 15:50:13 +0100 [thread overview]
Message-ID: <20251204145013.GN2528459@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20251204144142.61936-1-ellyesparza8@gmail.com>
On Thu, Dec 04, 2025 at 11:41:41AM -0300, ellyndra wrote:
> From: Elly I Esparza <ellyesparza8@gmail.com>
>
> Blacklist 'x64_sys_call()' from being kprobed to prevent syscall hooking
> techniques that overwrite the content of a 'case' block inside the main
> syscall dispatch switch statement.
>
> Also blacklist 'kallsyms_lookup_name()' to prevent a potential bypass
> of the blacklist, since this function can be used to discover and target
> arbitrary kernel symbols.
>
> Add a Kconfig option under security/ to enable or disable this feature.
>
> Signed-off-by: Elly I Esparza <ellyesparza8@gmail.com>
> ---
I'd be okay doing this unconditionally. Pretty much everything else
until that point lives in noinstr which is already excluded from probes.
next prev parent reply other threads:[~2025-12-04 14:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-04 14:41 ellyndra
2025-12-04 14:50 ` Peter Zijlstra [this message]
2025-12-08 15:01 ` Peter Zijlstra
2025-12-09 19:31 ` Elly Esparza
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