Messages in this thread Patch in this message | | | Date | Thu, 2 Aug 2012 19:05:43 +0800 | From | Fengguang Wu <> | Subject | [PATCH] isdnloop: fix and simplify isdnloop_init() |
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Fix a buffer overflow bug by removing the revision transform code.
[ 22.016214] isdnloop-ISDN-driver Rev 1.11.6.7 [ 22.097508] isdnloop: (loop0) virtual card added [ 22.174400] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff83244972 [ 22.174400] [ 22.436157] Pid: 1, comm: swapper Not tainted 3.5.0-bisect-00018-gfa8bbb1-dirty #129 [ 22.624071] Call Trace: [ 22.720558] [<ffffffff832448c3>] ? CallcNew+0x56/0x56 [ 22.815248] [<ffffffff8222b623>] panic+0x110/0x329 [ 22.914330] [<ffffffff83244972>] ? isdnloop_init+0xaf/0xb1 [ 23.014800] [<ffffffff832448c3>] ? CallcNew+0x56/0x56 [ 23.090763] [<ffffffff8108e24b>] __stack_chk_fail+0x2b/0x30 [ 23.185748] [<ffffffff83244972>] isdnloop_init+0xaf/0xb1
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> --- drivers/isdn/isdnloop/isdnloop.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-)
--- linux.orig/drivers/isdn/isdnloop/isdnloop.c 2012-05-24 19:03:06.748430938 +0800 +++ linux/drivers/isdn/isdnloop/isdnloop.c 2012-08-02 11:57:16.806437909 +0800 @@ -16,7 +16,7 @@ #include <linux/sched.h> #include "isdnloop.h" -static char *revision = "$Revision: 1.11.6.7 $"; +static char *revision = "1.11.6.7"; static char *isdnloop_id = "loop0"; MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card"); @@ -1494,16 +1494,7 @@ isdnloop_addcard(char *id1) static int __init isdnloop_init(void) { - char *p; - char rev[10]; - - if ((p = strchr(revision, ':'))) { - strcpy(rev, p + 1); - p = strchr(rev, '$'); - *p = 0; - } else - strcpy(rev, " ??? "); - printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev); + printk(KERN_NOTICE "isdnloop-ISDN-driver Rev %s\n", revision); if (isdnloop_id) return (isdnloop_addcard(isdnloop_id));
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