diff options
Diffstat (limited to 'm4/ax_check_user_namespace.m4')
| -rw-r--r-- | m4/ax_check_user_namespace.m4 | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/m4/ax_check_user_namespace.m4 b/m4/ax_check_user_namespace.m4 index 27ba698..aca7216 100644 --- a/m4/ax_check_user_namespace.m4 +++ b/m4/ax_check_user_namespace.m4 @@ -8,6 +8,9 @@ # # This macro checks whether the local system supports Linux user namespaces. # If so, it calls AC_DEFINE(HAVE_USER_NAMESPACE). +# +# Copyright (C) The c-ares team +# SPDX-License-Identifier: MIT AC_DEFUN([AX_CHECK_USER_NAMESPACE],[dnl AC_CACHE_CHECK([whether user namespaces are supported], @@ -34,9 +37,9 @@ int main() { pid_t child = clone(userfn, userst + 1024*1024, CLONE_NEWUSER|SIGCHLD, 0); if (child < 0) return 1; - sprintf(buffer, "/proc/%d/uid_map", child); + snprintf(buffer, sizeof(buffer), "/proc/%d/uid_map", child); fd = open(buffer, O_CREAT|O_WRONLY|O_TRUNC, 0755); - sprintf(buffer, "0 %d 1\n", getuid()); + snprintf(buffer, sizeof(buffer), "0 %d 1\n", getuid()); write(fd, buffer, strlen(buffer)); close(fd); |