mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

dyndbg: fix problem parsing format="foo bar" 

commit 14775b0496 ("dyndbg: accept query terms like file=bar and
module=foo") added the combined keyword=value parsing poorly; revert
most of it, keeping the keyword & arg change.

Instead, fix the tokenizer for the new input, by terminating the
keyword (an unquoted word) on '=' as well as space, thus letting the
tokenizer work on the quoted argument, like it would have previously.

Also add a few debug-prints to show more parsing context, into
tokenizer and parse-query, and use "keyword, value" in others.

Fixes: 14775b0496 ("dyndbg: accept query terms like file=bar and module=foo")
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20200831182210.850852-4-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Cromie 2020-08-31 12:22:10 -06:00 committed by Greg Kroah-Hartman
parent a2d375eda7
commit 42f07816ac
1 changed files with 17 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
lib/dynamic_debug.c
View File

@ -237,6 +237,7 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
{
int nwords = 0;
vpr_info("entry, buf:'%s'\n", buf);
while (*buf) {
char *end;
@ -247,6 +248,8 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
if (*buf == '#')
break; /* token starts comment, skip rest of line */
vpr_info("start-of-word:%d '%s'\n", nwords, buf);
/* find `end' of word, whitespace separated or quoted */
if (*buf == '"' || *buf == '\'') {
int quote = *buf++;
@ -257,7 +260,9 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
return -EINVAL; /* unclosed quote */
}
} else {
for (end = buf; *end && !isspace(*end); end++)
for (end = buf;
*end && *end != '=' && !isspace(*end);
end++)
;
BUG_ON(end == buf);
}
@ -373,30 +378,21 @@ static int ddebug_parse_query(char *words[], int nwords,
unsigned int i;
int rc = 0;
char *fline;
char *keyword, *arg;
if (modname)
if (nwords % 2 != 0) {
pr_err("expecting pairs of match-spec <value>\n");
return -EINVAL;
}
if (modname) {
/* support $modname.dyndbg=<multiple queries> */
vpr_info("module:%s queries:'%s'\n", modname);
query->module = modname;
}
for (i = 0; i < nwords; i += 2) {
char *keyword = words[i];
char *arg = words[i+1];
for (i = 0; i < nwords; i++) {
/* accept keyword=arg */
vpr_info("%d w:%s\n", i, words[i]);
keyword = words[i];
arg = strchr(keyword, '=');
if (arg) {
*arg++ = '\0';
} else {
i++; /* next word is arg */
if (!(i < nwords)) {
pr_err("missing arg to keyword: %s\n", keyword);
return -EINVAL;
}
arg = words[i];
}
vpr_info("%d key:%s arg:%s\n", i, keyword, arg);
vpr_info("keyword:'%s' value:'%s'\n", keyword, arg);
if (!strcmp(keyword, "func")) {
rc = check_set(&query->function, arg, "func");
} else if (!strcmp(keyword, "file")) {