This is a note to let you know that I've just added the patch titled
init/main.c: Fix potential static_command_line memory overflow
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
init-main.c-fix-potential-static_command_line-memory-overflow.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 46dad3c1e57897ab9228332f03e1c14798d2d3b9 Mon Sep 17 00:00:00 2001
From: Yuntao Wang <ytcoode@xxxxxxxxx>
Date: Fri, 12 Apr 2024 16:17:32 +0800
Subject: init/main.c: Fix potential static_command_line memory overflow
From: Yuntao Wang <ytcoode@xxxxxxxxx>
commit 46dad3c1e57897ab9228332f03e1c14798d2d3b9 upstream.
We allocate memory of size 'xlen + strlen(boot_command_line) + 1' for
static_command_line, but the strings copied into static_command_line are
extra_command_line and command_line, rather than extra_command_line and
boot_command_line.
When strlen(command_line) > strlen(boot_command_line), static_command_line
will overflow.
This patch just recovers strlen(command_line) which was miss-consolidated
with strlen(boot_command_line) in the commit f5c7310ac73e ("init/main: add
checks for the return value of memblock_alloc*()")
Link: https://lore.kernel.org/all/20240412081733.35925-2-ytcoode@xxxxxxxxx/
Fixes: f5c7310ac73e ("init/main: add checks for the return value of memblock_alloc*()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Yuntao Wang <ytcoode@xxxxxxxxx>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
init/main.c | 2 ++
1 file changed, 2 insertions(+)
--- a/init/main.c
+++ b/init/main.c
@@ -640,6 +640,8 @@ static void __init setup_command_line(ch
if (!saved_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
+ len = xlen + strlen(command_line) + 1;
+
static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!static_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
Patches currently in stable-queue which might be from ytcoode@xxxxxxxxx are
queue-5.15/init-main.c-fix-potential-static_command_line-memory-overflow.patch
