From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
3.4.108-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit 30a22c215a0007603ffc08021f2e8b64018517dd upstream.
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.
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[lizf: Backported to 3.4:
- adjust filename
- s/c->name/console_cmdline[i].name/]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
kernel/printk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/printk.c b/kernel/printk.c
index 544c021..cb72d9c 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -126,7 +126,7 @@ static struct console *exclusive_console;
*/
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
@@ -1498,6 +1498,7 @@ void register_console(struct console *newcon)
*/
for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0];
i++) {
+ BUILD_BUG_ON(sizeof(console_cmdline[i].name) != sizeof(newcon->name));
if (strcmp(console_cmdline[i].name, newcon->name) != 0)
continue;
if (newcon->index >= 0 &&
--
1.9.1
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