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| author | Jim Cromie <jim.cromie@gmail.com> | 2020-08-31 12:22:10 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-09-04 17:21:56 +0200 |
| commit | 42f07816ac0cc797928119cc039c414ae2b95d34 (patch) | |
| tree | e36e4a47340beadc5179ec382abff82f1718c1bd /lib | |
| parent | a2d375eda771a6a4866f3717a8ed81b63acb1dbd (diff) | |
| download | linux-42f07816ac0cc797928119cc039c414ae2b95d34.tar.gz linux-42f07816ac0cc797928119cc039c414ae2b95d34.tar.bz2 linux-42f07816ac0cc797928119cc039c414ae2b95d34.zip | |
dyndbg: fix problem parsing format="foo bar"
commit 14775b049642 ("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: 14775b049642 ("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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/dynamic_debug.c | 38 |
1 files changed, 17 insertions, 21 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 08e4b057514c..04f4c80b0d16 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -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")) { |