diff mbox series

scsi: qedi: remove memset/memcpy to nfunc and use func instead

Message ID 20190420040554.41888-1-yuehaibing@huawei.com (mailing list archive)
State Mainlined
Commit c09581a52765a85f19fc35340127396d5e3379cc
Headers show
Series scsi: qedi: remove memset/memcpy to nfunc and use func instead | expand

Commit Message

Yue Haibing April 20, 2019, 4:05 a.m. UTC
From: YueHaibing <yuehaibing@huawei.com>

KASAN report this:

BUG: KASAN: global-out-of-bounds in qedi_dbg_err+0xda/0x330 [qedi]
Read of size 31 at addr ffffffffc12b0ae0 by task syz-executor.0/2429

CPU: 0 PID: 2429 Comm: syz-executor.0 Not tainted 5.0.0-rc7+ #45
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xfa/0x1ce lib/dump_stack.c:113
 print_address_description+0x1c4/0x270 mm/kasan/report.c:187
 kasan_report+0x149/0x18d mm/kasan/report.c:317
 memcpy+0x1f/0x50 mm/kasan/common.c:130
 qedi_dbg_err+0xda/0x330 [qedi]
 ? 0xffffffffc12d0000
 qedi_init+0x118/0x1000 [qedi]
 ? 0xffffffffc12d0000
 ? 0xffffffffc12d0000
 ? 0xffffffffc12d0000
 do_one_initcall+0xfa/0x5ca init/main.c:887
 do_init_module+0x204/0x5f6 kernel/module.c:3460
 load_module+0x66b2/0x8570 kernel/module.c:3808
 __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902
 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x462e99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2d57e55c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000000000073bfa0 RCX: 0000000000462e99
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003
RBP: 00007f2d57e55c70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d57e566bc
R13: 00000000004bcefb R14: 00000000006f7030 R15: 0000000000000004

The buggy address belongs to the variable:
 __func__.67584+0x0/0xffffffffffffd520 [qedi]

Memory state around the buggy address:
 ffffffffc12b0980: fa fa fa fa 00 04 fa fa fa fa fa fa 00 00 05 fa
 ffffffffc12b0a00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 05 fa fa
> ffffffffc12b0a80: fa fa fa fa 00 06 fa fa fa fa fa fa 00 02 fa fa
                                                          ^
 ffffffffc12b0b00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 03 fa
 ffffffffc12b0b80: fa fa fa fa 00 00 02 fa fa fa fa fa 00 00 04 fa

Currently the qedi_dbg_* family of functions can overrun the end
of the source string if it is less than the destination buffer
length because of the use of a fixed sized memcpy. Remove the
memset/memcpy calls to nfunc and just use func instead as it
is always a null terminated string.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: ace7f46ba5fd ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/scsi/qedi/qedi_dbg.c | 32 ++++++++------------------------
 1 file changed, 8 insertions(+), 24 deletions(-)

Comments

Yue Haibing May 9, 2019, 2:50 p.m. UTC | #1
Friendly ping, could someone review this patch ?

On 2019/4/20 12:05, Yue Haibing wrote:
> From: YueHaibing <yuehaibing@huawei.com>
> 
> KASAN report this:
> 
> BUG: KASAN: global-out-of-bounds in qedi_dbg_err+0xda/0x330 [qedi]
> Read of size 31 at addr ffffffffc12b0ae0 by task syz-executor.0/2429
> 
> CPU: 0 PID: 2429 Comm: syz-executor.0 Not tainted 5.0.0-rc7+ #45
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0xfa/0x1ce lib/dump_stack.c:113
>  print_address_description+0x1c4/0x270 mm/kasan/report.c:187
>  kasan_report+0x149/0x18d mm/kasan/report.c:317
>  memcpy+0x1f/0x50 mm/kasan/common.c:130
>  qedi_dbg_err+0xda/0x330 [qedi]
>  ? 0xffffffffc12d0000
>  qedi_init+0x118/0x1000 [qedi]
>  ? 0xffffffffc12d0000
>  ? 0xffffffffc12d0000
>  ? 0xffffffffc12d0000
>  do_one_initcall+0xfa/0x5ca init/main.c:887
>  do_init_module+0x204/0x5f6 kernel/module.c:3460
>  load_module+0x66b2/0x8570 kernel/module.c:3808
>  __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902
>  do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x462e99
> Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f2d57e55c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> RAX: ffffffffffffffda RBX: 000000000073bfa0 RCX: 0000000000462e99
> RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000003
> RBP: 00007f2d57e55c70 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d57e566bc
> R13: 00000000004bcefb R14: 00000000006f7030 R15: 0000000000000004
> 
> The buggy address belongs to the variable:
>  __func__.67584+0x0/0xffffffffffffd520 [qedi]
> 
> Memory state around the buggy address:
>  ffffffffc12b0980: fa fa fa fa 00 04 fa fa fa fa fa fa 00 00 05 fa
>  ffffffffc12b0a00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 05 fa fa
>> ffffffffc12b0a80: fa fa fa fa 00 06 fa fa fa fa fa fa 00 02 fa fa
>                                                           ^
>  ffffffffc12b0b00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 03 fa
>  ffffffffc12b0b80: fa fa fa fa 00 00 02 fa fa fa fa fa 00 00 04 fa
> 
> Currently the qedi_dbg_* family of functions can overrun the end
> of the source string if it is less than the destination buffer
> length because of the use of a fixed sized memcpy. Remove the
> memset/memcpy calls to nfunc and just use func instead as it
> is always a null terminated string.
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Fixes: ace7f46ba5fd ("scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/scsi/qedi/qedi_dbg.c | 32 ++++++++------------------------
>  1 file changed, 8 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/scsi/qedi/qedi_dbg.c b/drivers/scsi/qedi/qedi_dbg.c
> index 8fd28b0..3383314 100644
> --- a/drivers/scsi/qedi/qedi_dbg.c
> +++ b/drivers/scsi/qedi/qedi_dbg.c
> @@ -16,10 +16,6 @@ qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  {
>  	va_list va;
>  	struct va_format vaf;
> -	char nfunc[32];
> -
> -	memset(nfunc, 0, sizeof(nfunc));
> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>  
>  	va_start(va, fmt);
>  
> @@ -28,9 +24,9 @@ qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  
>  	if (likely(qedi) && likely(qedi->pdev))
>  		pr_err("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
> -		       nfunc, line, qedi->host_no, &vaf);
> +		       func, line, qedi->host_no, &vaf);
>  	else
> -		pr_err("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> +		pr_err("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
>  
>  	va_end(va);
>  }
> @@ -41,10 +37,6 @@ qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  {
>  	va_list va;
>  	struct va_format vaf;
> -	char nfunc[32];
> -
> -	memset(nfunc, 0, sizeof(nfunc));
> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>  
>  	va_start(va, fmt);
>  
> @@ -56,9 +48,9 @@ qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  
>  	if (likely(qedi) && likely(qedi->pdev))
>  		pr_warn("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
> -			nfunc, line, qedi->host_no, &vaf);
> +			func, line, qedi->host_no, &vaf);
>  	else
> -		pr_warn("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> +		pr_warn("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
>  
>  ret:
>  	va_end(va);
> @@ -70,10 +62,6 @@ qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  {
>  	va_list va;
>  	struct va_format vaf;
> -	char nfunc[32];
> -
> -	memset(nfunc, 0, sizeof(nfunc));
> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>  
>  	va_start(va, fmt);
>  
> @@ -85,10 +73,10 @@ qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  
>  	if (likely(qedi) && likely(qedi->pdev))
>  		pr_notice("[%s]:[%s:%d]:%d: %pV",
> -			  dev_name(&qedi->pdev->dev), nfunc, line,
> +			  dev_name(&qedi->pdev->dev), func, line,
>  			  qedi->host_no, &vaf);
>  	else
> -		pr_notice("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> +		pr_notice("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
>  
>  ret:
>  	va_end(va);
> @@ -100,10 +88,6 @@ qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  {
>  	va_list va;
>  	struct va_format vaf;
> -	char nfunc[32];
> -
> -	memset(nfunc, 0, sizeof(nfunc));
> -	memcpy(nfunc, func, sizeof(nfunc) - 1);
>  
>  	va_start(va, fmt);
>  
> @@ -115,9 +99,9 @@ qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
>  
>  	if (likely(qedi) && likely(qedi->pdev))
>  		pr_info("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
> -			nfunc, line, qedi->host_no, &vaf);
> +			func, line, qedi->host_no, &vaf);
>  	else
> -		pr_info("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
> +		pr_info("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
>  
>  ret:
>  	va_end(va);
>
Dan Carpenter May 10, 2019, 11:29 a.m. UTC | #2
It took me a while to figure out that this is almost the same as Colin's
qedf patch but for qedi.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>

regards,
dan carpenter
Martin K. Petersen May 13, 2019, 10:31 p.m. UTC | #3
Yue,

> KASAN report this:
>
> BUG: KASAN: global-out-of-bounds in qedi_dbg_err+0xda/0x330 [qedi]
> Read of size 31 at addr ffffffffc12b0ae0 by task syz-executor.0/2429

Applied to 5.2/scsi-queue. Thanks!
diff mbox series

Patch

diff --git a/drivers/scsi/qedi/qedi_dbg.c b/drivers/scsi/qedi/qedi_dbg.c
index 8fd28b0..3383314 100644
--- a/drivers/scsi/qedi/qedi_dbg.c
+++ b/drivers/scsi/qedi/qedi_dbg.c
@@ -16,10 +16,6 @@  qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 {
 	va_list va;
 	struct va_format vaf;
-	char nfunc[32];
-
-	memset(nfunc, 0, sizeof(nfunc));
-	memcpy(nfunc, func, sizeof(nfunc) - 1);
 
 	va_start(va, fmt);
 
@@ -28,9 +24,9 @@  qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 
 	if (likely(qedi) && likely(qedi->pdev))
 		pr_err("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
-		       nfunc, line, qedi->host_no, &vaf);
+		       func, line, qedi->host_no, &vaf);
 	else
-		pr_err("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
+		pr_err("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
 
 	va_end(va);
 }
@@ -41,10 +37,6 @@  qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 {
 	va_list va;
 	struct va_format vaf;
-	char nfunc[32];
-
-	memset(nfunc, 0, sizeof(nfunc));
-	memcpy(nfunc, func, sizeof(nfunc) - 1);
 
 	va_start(va, fmt);
 
@@ -56,9 +48,9 @@  qedi_dbg_warn(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 
 	if (likely(qedi) && likely(qedi->pdev))
 		pr_warn("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
-			nfunc, line, qedi->host_no, &vaf);
+			func, line, qedi->host_no, &vaf);
 	else
-		pr_warn("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
+		pr_warn("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
 
 ret:
 	va_end(va);
@@ -70,10 +62,6 @@  qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 {
 	va_list va;
 	struct va_format vaf;
-	char nfunc[32];
-
-	memset(nfunc, 0, sizeof(nfunc));
-	memcpy(nfunc, func, sizeof(nfunc) - 1);
 
 	va_start(va, fmt);
 
@@ -85,10 +73,10 @@  qedi_dbg_notice(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 
 	if (likely(qedi) && likely(qedi->pdev))
 		pr_notice("[%s]:[%s:%d]:%d: %pV",
-			  dev_name(&qedi->pdev->dev), nfunc, line,
+			  dev_name(&qedi->pdev->dev), func, line,
 			  qedi->host_no, &vaf);
 	else
-		pr_notice("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
+		pr_notice("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
 
 ret:
 	va_end(va);
@@ -100,10 +88,6 @@  qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 {
 	va_list va;
 	struct va_format vaf;
-	char nfunc[32];
-
-	memset(nfunc, 0, sizeof(nfunc));
-	memcpy(nfunc, func, sizeof(nfunc) - 1);
 
 	va_start(va, fmt);
 
@@ -115,9 +99,9 @@  qedi_dbg_info(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
 
 	if (likely(qedi) && likely(qedi->pdev))
 		pr_info("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
-			nfunc, line, qedi->host_no, &vaf);
+			func, line, qedi->host_no, &vaf);
 	else
-		pr_info("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
+		pr_info("[0000:00:00.0]:[%s:%d]: %pV", func, line, &vaf);
 
 ret:
 	va_end(va);