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authorJunio C Hamano <gitster@pobox.com>2017-04-24 05:07:57 (GMT)
committerJunio C Hamano <gitster@pobox.com>2017-04-24 05:07:57 (GMT)
commit5938454cbc585e0f4bdd9f1cc87c6886a3c1bff3 (patch)
tree72bb28f592f0b3207fcfb25f243287ca6e4b18c3 /builtin/gc.c
parent2d646e3e1fd0ae7f525034abee73d06ac8946729 (diff)
parent5781a9a2703e96b01587bb95ceebcc53f2cee91c (diff)
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Merge branch 'dt/xgethostname-nul-termination'
gethostname(2) may not NUL terminate the buffer if hostname does not fit; unfortunately there is no easy way to see if our buffer was too small, but at least this will make sure we will not end up using garbage past the end of the buffer. * dt/xgethostname-nul-termination: xgethostname: handle long hostnames use HOST_NAME_MAX to size buffers for gethostname(2)
Diffstat (limited to 'builtin/gc.c')
-rw-r--r--builtin/gc.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/builtin/gc.c b/builtin/gc.c
index 2daede7..91f7696 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -232,7 +232,7 @@ static int need_to_gc(void)
static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
{
static struct lock_file lock;
- char my_host[128];
+ char my_host[HOST_NAME_MAX + 1];
struct strbuf sb = STRBUF_INIT;
struct stat st;
uintmax_t pid;
@@ -244,15 +244,19 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
/* already locked */
return NULL;
- if (gethostname(my_host, sizeof(my_host)))
+ if (xgethostname(my_host, sizeof(my_host)))
xsnprintf(my_host, sizeof(my_host), "unknown");
pidfile_path = git_pathdup("gc.pid");
fd = hold_lock_file_for_update(&lock, pidfile_path,
LOCK_DIE_ON_ERROR);
if (!force) {
- static char locking_host[128];
+ static char locking_host[HOST_NAME_MAX + 1];
+ static char *scan_fmt;
int should_exit;
+
+ if (!scan_fmt)
+ scan_fmt = xstrfmt("%s %%%dc", "%"SCNuMAX, HOST_NAME_MAX);
fp = fopen(pidfile_path, "r");
memset(locking_host, 0, sizeof(locking_host));
should_exit =
@@ -268,7 +272,7 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
* running.
*/
time(NULL) - st.st_mtime <= 12 * 3600 &&
- fscanf(fp, "%"SCNuMAX" %127c", &pid, locking_host) == 2 &&
+ fscanf(fp, scan_fmt, &pid, locking_host) == 2 &&
/* be gentle to concurrent "gc" on remote hosts */
(strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
if (fp != NULL)