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kdb: Use format-specifiers rather than memset() for padding in kdb_read()

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commit c9b51ddb66 upstream.

Currently when the current line should be removed from the display
kdb_read() uses memset() to fill a temporary buffer with spaces.
The problem is not that this could be trivially implemented using a
format string rather than open coding it. The real problem is that
it is possible, on systems with a long kdb_prompt_str, to write past
the end of the tmpbuffer.

Happily, as mentioned above, this can be trivially implemented using a
format string. Make it so!

Cc: stable@vger.kernel.org
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20240424-kgdb_read_refactor-v3-5-f236dbe9828d@linaro.org
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Thompson 2024-04-24 15:03:38 +01:00 committed by Greg Kroah-Hartman
parent e00ec562b0
commit ea303a7af8
1 changed files with 3 additions and 5 deletions
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8
kernel/debug/kdb/kdb_io.c
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@ -318,11 +318,9 @@ poll_again:
break;
case 14: /* Down */
case 16: /* Up */
memset(tmpbuffer, ' ',
strlen(kdb_prompt_str) + (lastchar-buffer));
*(tmpbuffer+strlen(kdb_prompt_str) +
(lastchar-buffer)) = '\0';
kdb_printf("\r%s\r", tmpbuffer);
kdb_printf("\r%*c\r",
(int)(strlen(kdb_prompt_str) + (lastchar - buffer)),
' ');
*lastchar = (char)key;
*(lastchar+1) = '\0';
return lastchar;