From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 19FCD37AA63 for ; Thu, 11 Jun 2026 11:42:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781178176; cv=none; b=WOYv+ZcK5aySrOA71twKZc3psspamLU5W608Cp4IaKyQD6+iWNQ0pC1X15ZMG0p/kQx0/5NCIaH/A0OEGB6Ikcj238zeH1Y8BkwDzQNV0JbmggJYbExA/jQsj3hk9KYNPtoXaJrULjf0J8voWWh7hzrbSl8fYlx5k00UjloWe10= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781178176; c=relaxed/simple; bh=7AeWU/YvqQF1PzEbyIyX0Xm/9Qgbqi4ptlcPxsVDmoQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NZURLSzaaNwegrgVphaXcvFhIHPVZzc5rZIW6lIPbuC1WMrt0YkJLvQgTSocCYvR0a5PACKGF9ACxdYWKdkP6SYP8Gr0qjGCYCeX55EasrPGfGU9z81IG25KUFyLgJKfzsjRqodJeCxVoBQjtRz3/KVp2MVqkKavdiOFxESdYOM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WTO1zsR5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WTO1zsR5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0722B1F0089F; Thu, 11 Jun 2026 11:42:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781178174; bh=q/sR1od44JgQMbXMM22aNq/uCPCFhrtr/V2T29hwrGM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WTO1zsR5Q3CeDbWHYJkGNaFC4K7A5vtRg2oTCMEu89w5p1OxGM5AhPTJ1Eshiw6vk 1WlnpdbW3fn6kJuqwWkNkWXlKzbHFV3HB64Rwqgl1KVuOjIuInbjDCIT8aWiqeRBbR BIH8ArQRw4OXKqX3DutFYRYXPn8yALCji2DYS0gM7DxVVNT2RsR0cW0OHLH7P5NSIo AUxqCH+pF6EyZjyxMfVFdc/mAXDIWyiFRt+SXMP9IOnjsflIpuEtrT0THwb1Wu1ARq f91KCWTMiDGuWBlNPvNmyplStbBxx8TuQh8XZQzcEbGuxJXndlmrl4fxQurlIuONfD Q/nrvRr5goksQ== From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , Oleg Nesterov , Masami Hiramatsu Subject: [PATCHv3 bpf-next 2/7] bpf: Use user_path_at for path resolution in uprobe_multi Date: Thu, 11 Jun 2026 13:42:25 +0200 Message-ID: <20260611114230.950379-3-jolsa@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260611114230.950379-1-jolsa@kernel.org> References: <20260611114230.950379-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Resolve the uprobe_multi user path with user_path_at() instead of copying the string with strndup_user() and passing it to kern_path(). This removes the temporary allocation and keeps the lookup logic in one helper. Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index b5a12af2d3f8..f8990bc6b64c 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3227,7 +3227,6 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr unsigned long size; u32 flags, cnt, i; struct path path; - char *name; pid_t pid; int err; @@ -3272,14 +3271,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr !access_ok(ucookies, size)) return -EFAULT; - name = strndup_user(upath, PATH_MAX); - if (IS_ERR(name)) { - err = PTR_ERR(name); - return err; - } - - err = kern_path(name, LOOKUP_FOLLOW, &path); - kfree(name); + err = user_path_at(AT_FDCWD, upath, LOOKUP_FOLLOW, &path); if (err) return err; -- 2.54.0