From a4b3ada83d06554d307dd54abdc62b2e5648264a Mon Sep 17 00:00:00 2001 From: Carl Henrik Lunde Date: Fri, 3 Apr 2009 14:27:15 +0200 Subject: blktrace: NUL-terminate user space messages Impact: fix corrupted blkparse output Make sure messages from user space are NUL-terminated strings, otherwise we could dump random memory to the block trace file. Additionally, I've limited the message to BLK_TN_MAX_MSG-1 characters, because the last character would be stripped by vscnprintf anyway. Signed-off-by: Carl Henrik Lunde Cc: Li Zefan Cc: Arnaldo Carvalho de Melo Cc: "Alan D. Brunelle" Cc: Steven Rostedt LKML-Reference: <20090403122714.GT5178@kernel.dk> Signed-off-by: Ingo Molnar --- kernel/trace/blktrace.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 947c5b3f90c4..a400b861fad3 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -327,10 +327,10 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, char *msg; struct blk_trace *bt; - if (count > BLK_TN_MAX_MSG) + if (count > BLK_TN_MAX_MSG - 1) return -EINVAL; - msg = kmalloc(count, GFP_KERNEL); + msg = kmalloc(count + 1, GFP_KERNEL); if (msg == NULL) return -ENOMEM; @@ -339,6 +339,7 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, return -EFAULT; } + msg[count] = '\0'; bt = filp->private_data; __trace_note_message(bt, "%s", msg); kfree(msg); -- cgit v1.2.2 From 7635b03adf3d7b84da7649b81efa91e6ebf11b85 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Fri, 3 Apr 2009 15:31:34 +0800 Subject: blktrace: small cleanup in blk_msg_write() Signed-off-by: Li Zefan Cc: Arnaldo Carvalho de Melo Cc: "Alan D. Brunelle" Cc: Jens Axboe LKML-Reference: <49D5BB56.7000807@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/blktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index a400b861fad3..73d7860b72e2 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -327,7 +327,7 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer, char *msg; struct blk_trace *bt; - if (count > BLK_TN_MAX_MSG - 1) + if (count >= BLK_TN_MAX_MSG) return -EINVAL; msg = kmalloc(count + 1, GFP_KERNEL); -- cgit v1.2.2 From e2494e1b42ebac402324105d57646489d19e2b01 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Thu, 2 Apr 2009 13:43:26 +0800 Subject: blktrace: fix pdu_len when tracing packet command requests Impact: output all of packet commands - not just the first 4 / 8 bytes Since commit d7e3c3249ef23b4617393c69fe464765b4ff1645 ("block: add large command support"), struct request->cmd has been changed from unsinged char cmd[BLK_MAX_CDB] to unsigned char *cmd. v1 -> v2: by: FUJITA Tomonori - make sure rq->cmd_len is always intialized, and then we can use rq->cmd_len instead of BLK_MAX_CDB. Signed-off-by: Li Zefan Acked-by: FUJITA Tomonori Cc: Arnaldo Carvalho de Melo Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Jens Axboe LKML-Reference: <49D4507E.2060602@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- block/blk-core.c | 1 + kernel/trace/blktrace.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 29bcfac6c688..859879d0a0bf 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -132,6 +132,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq) INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); rq->cmd = rq->__cmd; + rq->cmd_len = BLK_MAX_CDB; rq->tag = -1; rq->ref_count = 1; } diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 73d7860b72e2..b32ff446c3fb 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -643,7 +643,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq, if (blk_pc_request(rq)) { what |= BLK_TC_ACT(BLK_TC_PC); __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, - sizeof(rq->cmd), rq->cmd); + rq->cmd_len, rq->cmd); } else { what |= BLK_TC_ACT(BLK_TC_FS); __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, -- cgit v1.2.2