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authorRonny Chevalier <chevalier.ronny@gmail.com>2016-01-30 17:26:39 +0100
committerRonny Chevalier <chevalier.ronny@gmail.com>2016-02-28 14:44:26 +0100
commit19c0b0b9a5039b842cf9e6c3e7ece75fb8725602 (patch)
tree0414f22ec6d435c0d23457280b067e4b897d8186 /src/core
parent06fb28b16eb4b6170c2e2c0cf1f673730309509b (diff)
core: set NoNewPrivileges for seccomp if we don't have CAP_SYS_ADMIN
The manpage of seccomp specify that using seccomp with SECCOMP_SET_MODE_FILTER will return EACCES if the caller do not have CAP_SYS_ADMIN set, or if the no_new_privileges bit is not set. Hence, without NoNewPrivilege set, it is impossible to use a SystemCall* directive with a User directive set in system mode. Now, NoNewPrivileges is set if we are in user mode, or if we are in system mode and we don't have CAP_SYS_ADMIN, and SystemCall* directives are used.
Diffstat (limited to 'src/core')
-rw-r--r--src/core/execute.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/src/core/execute.c b/src/core/execute.c
index 8ede9e9afb..0c311ec330 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -24,6 +24,7 @@
#include <poll.h>
#include <signal.h>
#include <string.h>
+#include <sys/capability.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/socket.h>
@@ -1824,6 +1825,11 @@ static int exec_child(
if (params->apply_permissions) {
+ bool use_address_families = context->address_families_whitelist ||
+ !set_isempty(context->address_families);
+ bool use_syscall_filter = context->syscall_whitelist ||
+ !set_isempty(context->syscall_filter) ||
+ !set_isempty(context->syscall_archs);
int secure_bits = context->secure_bits;
for (i = 0; i < _RLIMIT_MAX; i++) {
@@ -1890,15 +1896,15 @@ static int exec_child(
return -errno;
}
- if (context->no_new_privileges)
+ if (context->no_new_privileges ||
+ (!have_effective_cap(CAP_SYS_ADMIN) && (use_address_families || use_syscall_filter)))
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
*exit_status = EXIT_NO_NEW_PRIVILEGES;
return -errno;
}
#ifdef HAVE_SECCOMP
- if (context->address_families_whitelist ||
- !set_isempty(context->address_families)) {
+ if (use_address_families) {
r = apply_address_families(context);
if (r < 0) {
*exit_status = EXIT_ADDRESS_FAMILIES;
@@ -1906,9 +1912,7 @@ static int exec_child(
}
}
- if (context->syscall_whitelist ||
- !set_isempty(context->syscall_filter) ||
- !set_isempty(context->syscall_archs)) {
+ if (use_syscall_filter) {
r = apply_seccomp(context);
if (r < 0) {
*exit_status = EXIT_SECCOMP;