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authorPeter Hurley <peter@hurleysoftware.com>2015-03-01 18:11:05 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-07 05:39:55 +0300
commit30a22c215a0007603ffc08021f2e8b64018517dd (patch)
tree44be9e8703c023cddd122b265c0bc41d12a15db3 /kernel/printk
parentf0bf0bd07943bfde8f5ac39a32664810a379c7d3 (diff)
downloadlinux-30a22c215a0007603ffc08021f2e8b64018517dd.tar.xz
console: Fix console name size mismatch
commit 6ae9200f2cab7 ("enlarge console.name") increased the storage for the console name to 16 bytes, but not the corresponding struct console_cmdline::name storage. Console names longer than 8 bytes cause read beyond end-of-string and failure to match console; I'm not sure if there are other unexpected consequences. Cc: <stable@vger.kernel.org> # 2.6.22+ Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/printk')
-rw-r--r--kernel/printk/console_cmdline.h2
-rw-r--r--kernel/printk/printk.c1
2 files changed, 2 insertions, 1 deletions
diff --git a/kernel/printk/console_cmdline.h b/kernel/printk/console_cmdline.h
index cbd69d842341..2ca4a8b5fe57 100644
--- a/kernel/printk/console_cmdline.h
+++ b/kernel/printk/console_cmdline.h
@@ -3,7 +3,7 @@
struct console_cmdline
{
- char name[8]; /* Name of the driver */
+ char name[16]; /* Name of the driver */
int index; /* Minor dev. to use */
char *options; /* Options for the driver */
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 01cfd69c54c6..bb0635bd74f2 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2464,6 +2464,7 @@ void register_console(struct console *newcon)
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
i++, c++) {
+ BUILD_BUG_ON(sizeof(c->name) != sizeof(newcon->name));
if (strcmp(c->name, newcon->name) != 0)
continue;
if (newcon->index >= 0 &&