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catalog: make sure strings are terminated

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Coverity complains: systemd-199/src/journal/catalog.c:126:
buffer_size_warning: Calling strncpy with a maximum size argument of
32 bytes on destination array "i->language" of size 32 bytes might
leave the destination string unterminated.

...and unfortunately it was right. The string was defined as a
fixed-size string in some parts of the code, and used a
null-terminated string in others (e.g. in log statements). There's no
point in conserving one byte, so just define the max language tag
length to 31 bytes, and use null terminated strings everywhere.

Also, wrap some lines, zero-fill less bytes, use '\0' instead of just
0 to be more explicit that this is one byte.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2013-03-27 23:16:32 -04:00
parent f459285212
commit 18cd5fe99f
1 changed files with 15 additions and 11 deletions
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26
src/journal/catalog.c
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@ -34,6 +34,7 @@
#include "hashmap.h"
#include "strv.h"
#include "strbuf.h"
#include "strxcpyx.h"
#include "conf-files.h"
#include "mkdir.h"
#include "catalog.h"
@ -96,7 +97,7 @@ static int catalog_compare_func(const void *a, const void *b) {
return 1;
}
return strncmp(i->language, j->language, sizeof(i->language));
return strcmp(i->language, j->language);
}
static int finish_item(
@ -123,12 +124,13 @@ static int finish_item(
return log_oom();
i->id = id;
strncpy(i->language, language, sizeof(i->language));
strscpy(i->language, sizeof(i->language), language);
i->offset = htole64((uint64_t) offset);
r = hashmap_put(h, i, i);
if (r == EEXIST) {
log_warning("Duplicate entry for " SD_ID128_FORMAT_STR ".%s, ignoring.", SD_ID128_FORMAT_VAL(id), language ? language : "C");
log_warning("Duplicate entry for " SD_ID128_FORMAT_STR ".%s, ignoring.",
SD_ID128_FORMAT_VAL(id), language ? language : "C");
free(i);
return 0;
}
@ -185,15 +187,15 @@ static int import_file(Hashmap *h, struct strbuf *sb, const char *path) {
line[0] == '-' &&
line[1] == '-' &&
line[2] == ' ' &&
(line[2+1+32] == ' ' || line[2+1+32] == 0)) {
(line[2+1+32] == ' ' || line[2+1+32] == '\0')) {
bool with_language;
sd_id128_t jd;
/* New entry */
with_language = line[2+1+32] != 0;
line[2+1+32] = 0;
with_language = line[2+1+32] != '\0';
line[2+1+32] = '\0';
if (sd_id128_from_string(line + 2 + 1, &jd) >= 0) {
@ -211,21 +213,21 @@ static int import_file(Hashmap *h, struct strbuf *sb, const char *path) {
log_error("[%s:%u] Language too short.", path, n);
return -EINVAL;
}
if (c > sizeof(language)) {
if (c > sizeof(language) - 1) {
log_error("[%s:%u] language too long.", path, n);
return -EINVAL;
}
strncpy(language, t, sizeof(language));
strscpy(language, sizeof(language), t);
} else
zero(language);
language[0] = '\0';
got_id = true;
empty_line = false;
id = jd;
if (payload)
payload[0] = 0;
payload[0] = '\0';
continue;
}
@ -324,7 +326,9 @@ int catalog_update(void) {
n = 0;
HASHMAP_FOREACH(i, h, j) {
log_debug("Found " SD_ID128_FORMAT_STR ", language %s", SD_ID128_FORMAT_VAL(i->id), isempty(i->language) ? "C" : i->language);
log_debug("Found " SD_ID128_FORMAT_STR ", language %s",
SD_ID128_FORMAT_VAL(i->id),
isempty(i->language) ? "C" : i->language);
items[n++] = *i;
}