Merge branch 'jk/snprintf-truncation'
Avoid unchecked snprintf() to make future code auditing easier.
* jk/snprintf-truncation:
fmt_with_err: add a comment that truncation is OK
shorten_unambiguous_ref: use xsnprintf
fsmonitor: use internal argv_array of struct child_process
log_write_email_headers: use strbufs
http: use strbufs instead of fixed buffers
diff --git a/fsmonitor.c b/fsmonitor.c
index ed3d1a0..665bd2d 100644
--- a/fsmonitor.c
+++ b/fsmonitor.c
@@ -97,19 +97,13 @@ void write_fsmonitor_extension(struct strbuf *sb, struct index_state *istate)
static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *query_result)
{
struct child_process cp = CHILD_PROCESS_INIT;
- char ver[64];
- char date[64];
- const char *argv[4];
- if (!(argv[0] = core_fsmonitor))
+ if (!core_fsmonitor)
return -1;
- snprintf(ver, sizeof(ver), "%d", version);
- snprintf(date, sizeof(date), "%" PRIuMAX, (uintmax_t)last_update);
- argv[1] = ver;
- argv[2] = date;
- argv[3] = NULL;
- cp.argv = argv;
+ argv_array_push(&cp.args, core_fsmonitor);
+ argv_array_pushf(&cp.args, "%d", version);
+ argv_array_pushf(&cp.args, "%" PRIuMAX, (uintmax_t)last_update);
cp.use_shell = 1;
cp.dir = get_git_work_tree();
diff --git a/http.c b/http.c
index d915597..deea474 100644
--- a/http.c
+++ b/http.c
@@ -2083,6 +2083,7 @@ void release_http_pack_request(struct http_pack_request *preq)
preq->packfile = NULL;
}
preq->slot = NULL;
+ strbuf_release(&preq->tmpfile);
free(preq->url);
free(preq);
}
@@ -2105,19 +2106,19 @@ int finish_http_pack_request(struct http_pack_request *preq)
lst = &((*lst)->next);
*lst = (*lst)->next;
- if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
+ if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
BUG("pack tmpfile does not end in .pack.temp?");
- tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
+ tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
argv_array_push(&ip.args, "index-pack");
argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
- argv_array_push(&ip.args, preq->tmpfile);
+ argv_array_push(&ip.args, preq->tmpfile.buf);
ip.git_cmd = 1;
ip.no_stdin = 1;
ip.no_stdout = 1;
if (run_command(&ip)) {
- unlink(preq->tmpfile);
+ unlink(preq->tmpfile.buf);
unlink(tmp_idx);
free(tmp_idx);
return -1;
@@ -2125,7 +2126,7 @@ int finish_http_pack_request(struct http_pack_request *preq)
unlink(sha1_pack_index_name(p->sha1));
- if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
+ if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->sha1))
|| finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
free(tmp_idx);
return -1;
@@ -2144,6 +2145,7 @@ struct http_pack_request *new_http_pack_request(
struct http_pack_request *preq;
preq = xcalloc(1, sizeof(*preq));
+ strbuf_init(&preq->tmpfile, 0);
preq->target = target;
end_url_with_slash(&buf, base_url);
@@ -2151,12 +2153,11 @@ struct http_pack_request *new_http_pack_request(
sha1_to_hex(target->sha1));
preq->url = strbuf_detach(&buf, NULL);
- snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
- sha1_pack_name(target->sha1));
- preq->packfile = fopen(preq->tmpfile, "a");
+ strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->sha1));
+ preq->packfile = fopen(preq->tmpfile.buf, "a");
if (!preq->packfile) {
error("Unable to open local file %s for pack",
- preq->tmpfile);
+ preq->tmpfile.buf);
goto abort;
}
@@ -2183,6 +2184,7 @@ struct http_pack_request *new_http_pack_request(
return preq;
abort:
+ strbuf_release(&preq->tmpfile);
free(preq->url);
free(preq);
return NULL;
@@ -2233,7 +2235,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
{
char *hex = sha1_to_hex(sha1);
struct strbuf filename = STRBUF_INIT;
- char prevfile[PATH_MAX];
+ struct strbuf prevfile = STRBUF_INIT;
int prevlocal;
char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
@@ -2241,40 +2243,41 @@ struct http_object_request *new_http_object_request(const char *base_url,
struct http_object_request *freq;
freq = xcalloc(1, sizeof(*freq));
+ strbuf_init(&freq->tmpfile, 0);
hashcpy(freq->sha1, sha1);
freq->localfile = -1;
sha1_file_name(the_repository, &filename, sha1);
- snprintf(freq->tmpfile, sizeof(freq->tmpfile),
- "%s.temp", filename.buf);
+ strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
- snprintf(prevfile, sizeof(prevfile), "%s.prev", filename.buf);
- unlink_or_warn(prevfile);
- rename(freq->tmpfile, prevfile);
- unlink_or_warn(freq->tmpfile);
+ strbuf_addf(&prevfile, "%s.prev", filename.buf);
+ unlink_or_warn(prevfile.buf);
+ rename(freq->tmpfile.buf, prevfile.buf);
+ unlink_or_warn(freq->tmpfile.buf);
strbuf_release(&filename);
if (freq->localfile != -1)
error("fd leakage in start: %d", freq->localfile);
- freq->localfile = open(freq->tmpfile,
+ freq->localfile = open(freq->tmpfile.buf,
O_WRONLY | O_CREAT | O_EXCL, 0666);
/*
* This could have failed due to the "lazy directory creation";
* try to mkdir the last path component.
*/
if (freq->localfile < 0 && errno == ENOENT) {
- char *dir = strrchr(freq->tmpfile, '/');
+ char *dir = strrchr(freq->tmpfile.buf, '/');
if (dir) {
*dir = 0;
- mkdir(freq->tmpfile, 0777);
+ mkdir(freq->tmpfile.buf, 0777);
*dir = '/';
}
- freq->localfile = open(freq->tmpfile,
+ freq->localfile = open(freq->tmpfile.buf,
O_WRONLY | O_CREAT | O_EXCL, 0666);
}
if (freq->localfile < 0) {
- error_errno("Couldn't create temporary file %s", freq->tmpfile);
+ error_errno("Couldn't create temporary file %s",
+ freq->tmpfile.buf);
goto abort;
}
@@ -2288,7 +2291,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
* If a previous temp file is present, process what was already
* fetched.
*/
- prevlocal = open(prevfile, O_RDONLY);
+ prevlocal = open(prevfile.buf, O_RDONLY);
if (prevlocal != -1) {
do {
prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
@@ -2305,7 +2308,8 @@ struct http_object_request *new_http_object_request(const char *base_url,
} while (prev_read > 0);
close(prevlocal);
}
- unlink_or_warn(prevfile);
+ unlink_or_warn(prevfile.buf);
+ strbuf_release(&prevfile);
/*
* Reset inflate/SHA1 if there was an error reading the previous temp
@@ -2320,7 +2324,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
lseek(freq->localfile, 0, SEEK_SET);
if (ftruncate(freq->localfile, 0) < 0) {
error_errno("Couldn't truncate temporary file %s",
- freq->tmpfile);
+ freq->tmpfile.buf);
goto abort;
}
}
@@ -2350,6 +2354,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
return freq;
abort:
+ strbuf_release(&prevfile);
free(freq->url);
free(freq);
return NULL;
@@ -2377,24 +2382,24 @@ int finish_http_object_request(struct http_object_request *freq)
if (freq->http_code == 416) {
warning("requested range invalid; we may already have all the data.");
} else if (freq->curl_result != CURLE_OK) {
- if (stat(freq->tmpfile, &st) == 0)
+ if (stat(freq->tmpfile.buf, &st) == 0)
if (st.st_size == 0)
- unlink_or_warn(freq->tmpfile);
+ unlink_or_warn(freq->tmpfile.buf);
return -1;
}
git_inflate_end(&freq->stream);
git_SHA1_Final(freq->real_sha1, &freq->c);
if (freq->zret != Z_STREAM_END) {
- unlink_or_warn(freq->tmpfile);
+ unlink_or_warn(freq->tmpfile.buf);
return -1;
}
if (hashcmp(freq->sha1, freq->real_sha1)) {
- unlink_or_warn(freq->tmpfile);
+ unlink_or_warn(freq->tmpfile.buf);
return -1;
}
sha1_file_name(the_repository, &filename, freq->sha1);
- freq->rename = finalize_object_file(freq->tmpfile, filename.buf);
+ freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
strbuf_release(&filename);
return freq->rename;
@@ -2402,7 +2407,7 @@ int finish_http_object_request(struct http_object_request *freq)
void abort_http_object_request(struct http_object_request *freq)
{
- unlink_or_warn(freq->tmpfile);
+ unlink_or_warn(freq->tmpfile.buf);
release_http_object_request(freq);
}
@@ -2422,4 +2427,5 @@ void release_http_object_request(struct http_object_request *freq)
release_active_slot(freq->slot);
freq->slot = NULL;
}
+ strbuf_release(&freq->tmpfile);
}
diff --git a/http.h b/http.h
index 4df4a25..d305ca1 100644
--- a/http.h
+++ b/http.h
@@ -207,7 +207,7 @@ struct http_pack_request {
struct packed_git *target;
struct packed_git **lst;
FILE *packfile;
- char tmpfile[PATH_MAX];
+ struct strbuf tmpfile;
struct active_request_slot *slot;
};
@@ -219,7 +219,7 @@ extern void release_http_pack_request(struct http_pack_request *preq);
/* Helpers for fetching object */
struct http_object_request {
char *url;
- char tmpfile[PATH_MAX];
+ struct strbuf tmpfile;
int localfile;
CURLcode curl_result;
char errorstr[CURL_ERROR_SIZE];
diff --git a/log-tree.c b/log-tree.c
index 724bae0..4aef853 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -387,11 +387,15 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
graph_show_oneline(opt->graph);
}
if (opt->mime_boundary && maybe_multipart) {
- static char subject_buffer[1024];
- static char buffer[1024];
+ static struct strbuf subject_buffer = STRBUF_INIT;
+ static struct strbuf buffer = STRBUF_INIT;
struct strbuf filename = STRBUF_INIT;
*need_8bit_cte_p = -1; /* NEVER */
- snprintf(subject_buffer, sizeof(subject_buffer) - 1,
+
+ strbuf_reset(&subject_buffer);
+ strbuf_reset(&buffer);
+
+ strbuf_addf(&subject_buffer,
"%s"
"MIME-Version: 1.0\n"
"Content-Type: multipart/mixed;"
@@ -406,13 +410,13 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
extra_headers ? extra_headers : "",
mime_boundary_leader, opt->mime_boundary,
mime_boundary_leader, opt->mime_boundary);
- extra_headers = subject_buffer;
+ extra_headers = subject_buffer.buf;
if (opt->numbered_files)
strbuf_addf(&filename, "%d", opt->nr);
else
fmt_output_commit(&filename, commit, opt);
- snprintf(buffer, sizeof(buffer) - 1,
+ strbuf_addf(&buffer,
"\n--%s%s\n"
"Content-Type: text/x-patch;"
" name=\"%s\"\n"
@@ -423,7 +427,7 @@ void log_write_email_headers(struct rev_info *opt, struct commit *commit,
filename.buf,
opt->no_inline ? "attachment" : "inline",
filename.buf);
- opt->diffopt.stat_sep = buffer;
+ opt->diffopt.stat_sep = buffer.buf;
strbuf_release(&filename);
}
*extra_headers_p = extra_headers;
diff --git a/refs.c b/refs.c
index 20fb35d..0eb379f 100644
--- a/refs.c
+++ b/refs.c
@@ -1162,8 +1162,8 @@ char *shorten_unambiguous_ref(const char *refname, int strict)
for (i = 0; i < nr_rules; i++) {
assert(offset < total_len);
scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
- offset += snprintf(scanf_fmts[i], total_len - offset,
- ref_rev_parse_rules[i], 2, "%s") + 1;
+ offset += xsnprintf(scanf_fmts[i], total_len - offset,
+ ref_rev_parse_rules[i], 2, "%s") + 1;
}
}
diff --git a/usage.c b/usage.c
index 9c84dcc..cc80333 100644
--- a/usage.c
+++ b/usage.c
@@ -148,6 +148,7 @@ static const char *fmt_with_err(char *buf, int n, const char *fmt)
}
}
str_error[j] = 0;
+ /* Truncation is acceptable here */
snprintf(buf, n, "%s: %s", fmt, str_error);
return buf;
}
