From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D34A31C291 for ; Wed, 4 Oct 2023 18:36:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="q2yfEB6G" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 527DFC433CA; Wed, 4 Oct 2023 18:36:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696444568; bh=Y7+vlHR17M3KExVDkgCU/WLIRViTftk9J2NuCkeh4Ig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q2yfEB6GKNGWa0MWoXh4Bam74nqpzt2qg4J3gjnHVJC0Q1vUt/R4qs8NTPaeNzQzv XZsJANyA98fnY+RTvOSS50MOSUkVKlke4yL77dn4Pn0ZJiicnFI4cRxRmvyShnT0N8 SDbpLJsDL0Hdn0a9GnJM8pH5GkwdGWxP2DgRgLqg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jiri Olsa , Andrii Nakryiko , Alan Maguire Subject: [PATCH 6.5 296/321] bpf: Add override check to kprobe multi link attach Date: Wed, 4 Oct 2023 19:57:21 +0200 Message-ID: <20231004175243.006816219@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175229.211487444@linuxfoundation.org> References: <20231004175229.211487444@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiri Olsa commit 41bc46c12a8053a1b3279a379bd6b5e87b045b85 upstream. Currently the multi_kprobe link attach does not check error injection list for programs with bpf_override_return helper and allows them to attach anywhere. Adding the missing check. Fixes: 0dcac2725406 ("bpf: Add multi kprobe link") Signed-off-by: Jiri Olsa Signed-off-by: Andrii Nakryiko Reviewed-by: Alan Maguire Cc: stable@vger.kernel.org Link: https://lore.kernel.org/bpf/20230907200652.926951-1-jolsa@kernel.org Signed-off-by: Greg Kroah-Hartman --- kernel/trace/bpf_trace.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2772,6 +2772,17 @@ static int get_modules_for_addrs(struct return arr.mods_cnt; } +static int addrs_check_error_injection_list(unsigned long *addrs, u32 cnt) +{ + u32 i; + + for (i = 0; i < cnt; i++) { + if (!within_error_injection_list(addrs[i])) + return -EINVAL; + } + return 0; +} + int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) { struct bpf_kprobe_multi_link *link = NULL; @@ -2849,6 +2860,11 @@ int bpf_kprobe_multi_link_attach(const u goto error; } + if (prog->kprobe_override && addrs_check_error_injection_list(addrs, cnt)) { + err = -EINVAL; + goto error; + } + link = kzalloc(sizeof(*link), GFP_KERNEL); if (!link) { err = -ENOMEM;