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SubjectRe: [PATCH] kdb: Fix bound check compiler warning
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On 5/8/19 4:16 PM, Daniel Thompson wrote:
> On Wed, May 08, 2019 at 09:52:39AM +0800, Wenlin Kang wrote:
>> The strncpy() function may leave the destination string buffer
>> unterminated, better use strlcpy() instead.
>>
>> This fixes the following warning with gcc 8.2:
>>
>> kernel/debug/kdb/kdb_io.c: In function 'kdb_getstr':
>> kernel/debug/kdb/kdb_io.c:449:3: warning: 'strncpy' specified bound 256 equals destination size [-Wstringop-truncation]
>> strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
>> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
>> ---
>> kernel/debug/kdb/kdb_io.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
>> index 6a4b414..7fd4513 100644
>> --- a/kernel/debug/kdb/kdb_io.c
>> +++ b/kernel/debug/kdb/kdb_io.c
>> @@ -446,7 +446,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
>> char *kdb_getstr(char *buffer, size_t bufsize, const char *prompt)
>> {
>> if (prompt && kdb_prompt_str != prompt)
>> - strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
>> + strlcpy(kdb_prompt_str, prompt, CMD_BUFLEN);
> Shouldn't that be strscpy?


Hi Daniel

I thought about strscpy, but I think strlcpy is better, because it only
copy the real number of characters if src string less than that size.


>
>
> Daniel.
>
>> kdb_printf(kdb_prompt_str);
>> kdb_nextline = 1; /* Prompt and input resets line number */
>> return kdb_read(buffer, bufsize);
>> --
>> 1.9.1
>>

--
Thanks,
Wenlin Kang

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