From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [RFC PATCH 5/7] kernel/kthread.c: do runtime check of format string in kthread_create_on_cpu()
Date: Sat, 27 Oct 2018 01:24:07 +0200 [thread overview]
Message-ID: <20181026232409.16100-6-linux@rasmusvillemoes.dk> (raw)
In-Reply-To: <20181026232409.16100-1-linux@rasmusvillemoes.dk>
One is supposed to pass in a format string containing (at most) one %u
instance. Use fmtcheck() to enforce that at runtime, WARNing and falling
back to a harmless "kthread/%u" in case verification fails.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
kernel/kthread.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 087d18d771b5..fddfe605632b 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -441,8 +441,8 @@ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
{
struct task_struct *p;
- p = kthread_create_on_node(threadfn, data, cpu_to_node(cpu), namefmt,
- cpu);
+ p = kthread_create_on_node(threadfn, data, cpu_to_node(cpu),
+ fmtcheck(namefmt, "kthread/%u", 0), cpu);
if (IS_ERR(p))
return p;
kthread_bind(p, cpu);
--
2.19.1.6.gbde171bbf5
next prev parent reply other threads:[~2018-10-26 23:24 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-08 22:30 [RFC 0/6] some compile- and run-time format checking Rasmus Villemoes
2017-11-08 22:30 ` [RFC 1/6] plugins: implement format_template attribute Rasmus Villemoes
2017-11-08 22:30 ` [RFC 2/6] compiler.h: add __format_template Rasmus Villemoes
2017-11-08 22:30 ` [RFC 3/6] compiler.h: add __attribute__((format_arg)) shorthand Rasmus Villemoes
2017-11-08 22:30 ` [RFC 4/6] lib/vsprintf.c: add fmtcheck utility Rasmus Villemoes
2017-11-09 1:08 ` Kees Cook
2017-11-08 22:30 ` [RFC 5/6] kernel.h: implement fmtmatch() wrapper around fmtcheck() Rasmus Villemoes
2017-11-08 22:30 ` [RFC 6/6] lib/test_printf.c: add a few fmtcheck() test cases Rasmus Villemoes
2017-11-09 1:11 ` [RFC 0/6] some compile- and run-time format checking Kees Cook
2017-11-09 14:08 ` Rasmus Villemoes
2018-10-26 23:24 ` [RFC PATCH 0/7] runtime format string checking Rasmus Villemoes
2018-10-26 23:24 ` [RFC PATCH 1/7] compiler_attributes.h: add __attribute__((format_arg)) shorthand Rasmus Villemoes
2018-10-27 12:06 ` Miguel Ojeda
2018-10-29 10:20 ` Rasmus Villemoes
2018-10-29 19:17 ` Miguel Ojeda
2018-11-02 10:36 ` Miguel Ojeda
2018-11-02 10:43 ` Rasmus Villemoes
2019-01-09 10:57 ` Miguel Ojeda
2018-10-26 23:24 ` [RFC PATCH 2/7] lib/vsprintf.c: add fmtcheck utility Rasmus Villemoes
2018-10-26 23:24 ` [RFC PATCH 3/7] kernel.h: implement fmtmatch() wrapper around fmtcheck() Rasmus Villemoes
2018-10-26 23:24 ` [RFC PATCH 4/7] lib/test_printf.c: add a few fmtcheck() test cases Rasmus Villemoes
2018-10-26 23:24 ` Rasmus Villemoes [this message]
2018-10-26 23:24 ` [RFC PATCH 6/7] nfs: use fmtcheck() in root_nfs_data Rasmus Villemoes
2018-10-26 23:24 ` [RFC PATCH 7/7] drivers: hwmon: add runtime format string checking Rasmus Villemoes
2018-10-27 17:44 ` Guenter Roeck
2018-10-30 20:58 ` [RFC PATCH 0/7] " Kees Cook
2018-11-01 22:06 ` Rasmus Villemoes
2018-11-01 22:57 ` Kees Cook
2018-11-02 20:09 ` Rasmus Villemoes
2018-11-02 20:46 ` Kees Cook
2018-11-05 9:33 ` Rasmus Villemoes
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