This is a note to let you know that I've just added the patch titled
kdb: Fix bound check compiler warning
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kdb-fix-bound-check-compiler-warning.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 21f00cb98e9f1d8d1f91d2274b1c04652015d3b1
Author: Wenlin Kang <wenlin.kang@xxxxxxxxxxxxx>
Date: Mon May 13 16:57:20 2019 +0800
kdb: Fix bound check compiler warning
[ Upstream commit ca976bfb3154c7bc67c4651ecd144fdf67ccaee7 ]
The strncpy() function may leave the destination string buffer
unterminated, better use strscpy() 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@xxxxxxxxxxxxx>
Signed-off-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Stable-dep-of: 70867efacf43 ("kdb: address -Wformat-security warnings")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index acc8e13b823b2..5358e8a8b6f11 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -459,7 +459,7 @@ 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);
+ strscpy(kdb_prompt_str, prompt, CMD_BUFLEN);
kdb_printf(kdb_prompt_str);
kdb_nextline = 1; /* Prompt and input resets line number */
return kdb_read(buffer, bufsize);
