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Merge pull request #3972 from mjstapp/fix_privs_race

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libs: fix race in privs changes
This commit is contained in:
Donald Sharp 2019-03-22 02:32:17 -04:00 committed by GitHub
commit 6e0d7d0dbb
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 21 additions and 20 deletions
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41
lib/privs.c
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@ -708,19 +708,19 @@ struct zebra_privs_t *_zprivs_raise(struct zebra_privs_t *privs,
/* If we're already elevated, just return */
pthread_mutex_lock(&(privs->mutex));
if (++privs->refcount > 1) {
pthread_mutex_unlock(&(privs->mutex));
return privs;
{
if (++(privs->refcount) == 1) {
errno = 0;
if (privs->change(ZPRIVS_RAISE)) {
zlog_err("%s: Failed to raise privileges (%s)",
funcname, safe_strerror(errno));
}
errno = save_errno;
privs->raised_in_funcname = funcname;
}
}
pthread_mutex_unlock(&(privs->mutex));
errno = 0;
if (privs->change(ZPRIVS_RAISE)) {
zlog_err("%s: Failed to raise privileges (%s)",
funcname, safe_strerror(errno));
}
errno = save_errno;
privs->raised_in_funcname = funcname;
return privs;
}
@ -733,19 +733,20 @@ void _zprivs_lower(struct zebra_privs_t **privs)
/* Don't lower privs if there's another caller */
pthread_mutex_lock(&(*privs)->mutex);
if (--((*privs)->refcount) > 0) {
pthread_mutex_unlock(&(*privs)->mutex);
return;
{
if (--((*privs)->refcount) == 0) {
errno = 0;
if ((*privs)->change(ZPRIVS_LOWER)) {
zlog_err("%s: Failed to lower privileges (%s)",
(*privs)->raised_in_funcname,
safe_strerror(errno));
}
errno = save_errno;
(*privs)->raised_in_funcname = NULL;
}
}
pthread_mutex_unlock(&(*privs)->mutex);
errno = 0;
if ((*privs)->change(ZPRIVS_LOWER)) {
zlog_err("%s: Failed to lower privileges (%s)",
(*privs)->raised_in_funcname, safe_strerror(errno));
}
errno = save_errno;
(*privs)->raised_in_funcname = NULL;
*privs = NULL;
}