path: root/kernel/debug/kdb
diff options
authorDaniel Thompson <daniel.thompson@linaro.org>2020-09-09 15:17:08 +0100
committerDaniel Thompson <daniel.thompson@linaro.org>2020-10-01 14:44:08 +0100
commitd081a6e353168f15e63eb9e9334757f20343319f (patch)
tree1f58904a23ee4690b2ed9ea4ae8e50d30ad6882d /kernel/debug/kdb
parent771910f719651789adee8260e1a2c4c0ba161007 (diff)
kdb: Fix pager search for multi-line strings
Currently using forward search doesn't handle multi-line strings correctly. The search routine replaces line breaks with \0 during the search and, for regular searches ("help | grep Common\n"), there is code after the line has been discarded or printed to replace the break character. However during a pager search ("help\n" followed by "/Common\n") when the string is matched we will immediately return to normal output and the code that should restore the \n becomes unreachable. Fix this by restoring the replaced character when we disable the search mode and update the comment accordingly. Fixes: fb6daa7520f9d ("kdb: Provide forward search at more prompt") Link: https://lore.kernel.org/r/20200909141708.338273-1-daniel.thompson@linaro.org Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Diffstat (limited to 'kernel/debug/kdb')
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index e7835ca88e16..6735ac36b718 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -706,12 +706,16 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
size_avail = sizeof(kdb_buffer) - len;
goto kdb_print_out;
- if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH)
+ if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH) {
* This was a interactive search (using '/' at more
- * prompt) and it has completed. Clear the flag.
+ * prompt) and it has completed. Replace the \0 with
+ * its original value to ensure multi-line strings
+ * are handled properly, and return to normal mode.
+ *cphold = replaced_byte;
kdb_grepping_flag = 0;
+ }
* at this point the string is a full line and
* should be printed, up to the null.

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