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 C004F215F64; Wed, 25 Sep 2024 12:12:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727266368; cv=none; b=OwgjNhn3Jw5DBWYiOQrvzF9qoVfTTdvqdiVGRIt3b/s7rGGHxbvJ362jdUOkD8Ex+bF6rlAnU6prWY6clDbZ2N7GPXD93y3GsZzeP/IcAitYfjkmyLCNBJfNWdwJEAHfwH6Lkw4YUXiDaBlchJdZZmpG8b1w4nHVHCOPpLihmvQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727266368; c=relaxed/simple; bh=qH+35EJtY/CJZO2ZhXddPaWDqfoduAQDG3OYBQ9fNOI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UVgM1AKbOhUliUQTnQOPNeJwmeoONFL8Vr/lAfvNZ+rnFwsZJEIIzt8QyeS1CWQXxtrX5U/rzbQt7WEhBNfnnfqCKU+o2Y2CZ7xiDHh/gW5GOBJ92/4pYOTtM1Me8fmRKpvZ85C4X8+rQ3CabFwaiFYkhJdLsL9QAM7Cbqc1uGw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BQWxlOkj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BQWxlOkj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28343C4CEC3; Wed, 25 Sep 2024 12:12:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727266368; bh=qH+35EJtY/CJZO2ZhXddPaWDqfoduAQDG3OYBQ9fNOI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BQWxlOkjTdPF+qBsyvfqHG2zipeVLksK+CJgJ4yGH5Gga++phmyXtvq+1ReR3KYeJ 7MCKmrzTqoOxWBPPP069hqGZYX9ooMmYVfPGzhog+uagUn5SCX8z9tmQ+MFZz5S/LW l2aJUegrGTldATJZPjUG/25GxQcUN1yyxRXVGyAFpioEGy4he/8YxqbrTCLF5WnmtB SvUoyMghAZWSCZSC7KvjEn4g0sADc6tG45g88sp/M5cKQF8ANI7eIEBc+fSi+Z0rZX dnaGbA27JpeDeOe9Ktb8901dd4GE2Rbu2A+ixMD84bueCMEFSXc//DHzYw7NASjHuW Fuv0smjZPNGuw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Simon Horman , Jakub Kicinski , Sasha Levin , jmaloy@redhat.com, ying.xue@windriver.com, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, netdev@vger.kernel.org, tipc-discussion@lists.sourceforge.net Subject: [PATCH AUTOSEL 6.6 033/139] tipc: guard against string buffer overrun Date: Wed, 25 Sep 2024 08:07:33 -0400 Message-ID: <20240925121137.1307574-33-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240925121137.1307574-1-sashal@kernel.org> References: <20240925121137.1307574-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.52 Content-Transfer-Encoding: 8bit From: Simon Horman [ Upstream commit 6555a2a9212be6983d2319d65276484f7c5f431a ] Smatch reports that copying media_name and if_name to name_parts may overwrite the destination. .../bearer.c:166 bearer_name_validate() error: strcpy() 'media_name' too large for 'name_parts->media_name' (32 vs 16) .../bearer.c:167 bearer_name_validate() error: strcpy() 'if_name' too large for 'name_parts->if_name' (1010102 vs 16) This does seem to be the case so guard against this possibility by using strscpy() and failing if truncation occurs. Introduced by commit b97bf3fd8f6a ("[TIPC] Initial merge") Compile tested only. Reviewed-by: Jakub Kicinski Signed-off-by: Simon Horman Link: https://patch.msgid.link/20240801-tipic-overrun-v2-1-c5b869d1f074@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/tipc/bearer.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 878415c435276..fec638e494c9d 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -163,8 +163,12 @@ static int bearer_name_validate(const char *name, /* return bearer name components, if necessary */ if (name_parts) { - strcpy(name_parts->media_name, media_name); - strcpy(name_parts->if_name, if_name); + if (strscpy(name_parts->media_name, media_name, + TIPC_MAX_MEDIA_NAME) < 0) + return 0; + if (strscpy(name_parts->if_name, if_name, + TIPC_MAX_IF_NAME) < 0) + return 0; } return 1; } -- 2.43.0