From: tip-bot for He Zhe <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: zhe.he@windriver.com, peterz@infradead.org, mingo@kernel.org,
torvalds@linux-foundation.org, tglx@linutronix.de, hpa@zytor.com,
linux-kernel@vger.kernel.org
Subject: [tip:x86/boot] x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided
Date: Mon, 10 Sep 2018 23:18:58 -0700 [thread overview]
Message-ID: <tip-ccde460b9ae5c2bd5e4742af0a7f623c2daad566@git.kernel.org> (raw)
In-Reply-To: <1534260823-87917-1-git-send-email-zhe.he@windriver.com>
Commit-ID: ccde460b9ae5c2bd5e4742af0a7f623c2daad566
Gitweb: https://git.kernel.org/tip/ccde460b9ae5c2bd5e4742af0a7f623c2daad566
Author: He Zhe <zhe.he@windriver.com>
AuthorDate: Tue, 14 Aug 2018 23:33:42 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 10 Sep 2018 14:47:32 +0200
x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided
memory_corruption_check[{_period|_size}]()'s handlers do not check input
argument before passing it to kstrtoul() or simple_strtoull(). The argument
would be a NULL pointer if each of the kernel parameters, without its
value, is set in command line and thus cause the following panic.
PANIC: early exception 0xe3 IP 10:ffffffff73587c22 error 0 cr2 0x0
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.18-rc8+ #2
[ 0.000000] RIP: 0010:kstrtoull+0x2/0x10
...
[ 0.000000] Call Trace
[ 0.000000] ? set_corruption_check+0x21/0x49
[ 0.000000] ? do_early_param+0x4d/0x82
[ 0.000000] ? parse_args+0x212/0x330
[ 0.000000] ? rdinit_setup+0x26/0x26
[ 0.000000] ? parse_early_options+0x20/0x23
[ 0.000000] ? rdinit_setup+0x26/0x26
[ 0.000000] ? parse_early_param+0x2d/0x39
[ 0.000000] ? setup_arch+0x2f7/0xbf4
[ 0.000000] ? start_kernel+0x5e/0x4c2
[ 0.000000] ? load_ucode_bsp+0x113/0x12f
[ 0.000000] ? secondary_startup_64+0xa5/0xb0
This patch adds checks to prevent the panic.
Signed-off-by: He Zhe <zhe.he@windriver.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: gregkh@linuxfoundation.org
Cc: kstewart@linuxfoundation.org
Cc: pombredanne@nexb.com
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1534260823-87917-1-git-send-email-zhe.he@windriver.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/check.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/x86/kernel/check.c b/arch/x86/kernel/check.c
index 33399426793e..cc8258a5378b 100644
--- a/arch/x86/kernel/check.c
+++ b/arch/x86/kernel/check.c
@@ -31,6 +31,11 @@ static __init int set_corruption_check(char *arg)
ssize_t ret;
unsigned long val;
+ if (!arg) {
+ pr_err("memory_corruption_check config string not provided\n");
+ return -EINVAL;
+ }
+
ret = kstrtoul(arg, 10, &val);
if (ret)
return ret;
@@ -45,6 +50,11 @@ static __init int set_corruption_check_period(char *arg)
ssize_t ret;
unsigned long val;
+ if (!arg) {
+ pr_err("memory_corruption_check_period config string not provided\n");
+ return -EINVAL;
+ }
+
ret = kstrtoul(arg, 10, &val);
if (ret)
return ret;
@@ -59,6 +69,11 @@ static __init int set_corruption_check_size(char *arg)
char *end;
unsigned size;
+ if (!arg) {
+ pr_err("memory_corruption_check_size config string not provided\n");
+ return -EINVAL;
+ }
+
size = memparse(arg, &end);
if (*end == '\0')
prev parent reply other threads:[~2018-09-11 6:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-14 15:33 [PATCH v2 1/2] x86: corruption-check: Passing memory_corruption_check to command line causes panic zhe.he
2018-08-14 15:33 ` [PATCH v2 2/2] x86: corruption-check: Change printk to the right fashion zhe.he
2018-09-11 6:19 ` [tip:x86/boot] x86/corruption-check: Use pr_*() instead of printk() tip-bot for He Zhe
2018-08-20 8:56 ` [PATCH v2 1/2] x86: corruption-check: Passing memory_corruption_check to command line causes panic He Zhe
2018-08-20 17:18 ` Greg KH
2018-09-11 6:18 ` tip-bot for He Zhe [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=tip-ccde460b9ae5c2bd5e4742af0a7f623c2daad566@git.kernel.org \
--to=tipbot@zytor.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=zhe.he@windriver.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).