* [PATCH V4] Fix buffer size warning for strcpy
@ 2021-08-24 12:30 Nigel Croxon
2021-08-24 13:06 ` Tkaczyk, Mariusz
0 siblings, 1 reply; 2+ messages in thread
From: Nigel Croxon @ 2021-08-24 12:30 UTC (permalink / raw)
To: neilb, jes, xni, linux-raid, mariusz.tkaczyk
To meet requirements of Common Criteria certification vulnerability
assessment. Static code analysis has been run and found the following
error:
buffer_size_warning: Calling "strncpy" with a maximum size
argument of 16 bytes on destination array "ve->name" of
size 16 bytes might leave the destination string unterminated.
The change is to make the destination size to fit the allocated size.
V4:
Code cleanup of the interim "if" statement.
V3: Doc change only:
The code change from filling ve->name with spaces to filling it with
null-terminated is to comform to the SNIA - Common RAID Disk Data
Format Specification. The format for VD_Name (ve->name) specifies
the field to be either ASCII or UNICODE. Bit 2 of the VD_Type field
MUST be used to determine the Unicode or ASCII format of this field.
If this field is not used, all bytes MUST be set to zero.
V2: Change from zero-terminated to zero-padded on memset and
change from using strncpy to memcpy, feedback from Neil Brown.
Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
---
super-ddf.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/super-ddf.c b/super-ddf.c
index dc8e512f..db2aaa7a 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -2637,9 +2637,9 @@ static int init_super_ddf_bvd(struct supertype *st,
ve->init_state = DDF_init_not;
memset(ve->pad1, 0xff, 14);
- memset(ve->name, ' ', 16);
+ memset(ve->name, '\0', sizeof(ve->name));
if (name)
- strncpy(ve->name, name, 16);
+ memcpy(ve->name, name, strnlen(ve->name, sizeof(ve->name)));
ddf->virt->populated_vdes =
cpu_to_be16(be16_to_cpu(ddf->virt->populated_vdes)+1);
--
2.29.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V4] Fix buffer size warning for strcpy
2021-08-24 12:30 [PATCH V4] Fix buffer size warning for strcpy Nigel Croxon
@ 2021-08-24 13:06 ` Tkaczyk, Mariusz
0 siblings, 0 replies; 2+ messages in thread
From: Tkaczyk, Mariusz @ 2021-08-24 13:06 UTC (permalink / raw)
To: Nigel Croxon, jes, linux-raid
Hello Nigel,
> - memset(ve->name, ' ', 16);
> + memset(ve->name, '\0', sizeof(ve->name));
> if (name)
> - strncpy(ve->name, name, 16);
> + memcpy(ve->name, name, strnlen(ve->name, sizeof(ve->name)));
> ddf->virt->populated_vdes =
> cpu_to_be16(be16_to_cpu(ddf->virt->populated_vdes)+1);
As I wrote under v3, you should use 'name' instead 've->name' in strnlen.
've->name' has length 0. You can also consider usage of memccpy.
Thanks,
Mariusz
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2021-08-24 12:30 [PATCH V4] Fix buffer size warning for strcpy Nigel Croxon
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