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-rw-r--r--src/core/execute.c88
-rw-r--r--src/nspawn/nspawn-seccomp.c18
-rw-r--r--src/shared/seccomp-util.c30
-rw-r--r--src/shared/seccomp-util.h4
4 files changed, 53 insertions, 87 deletions
diff --git a/src/core/execute.c b/src/core/execute.c
index f435a079c7..668504c5cf 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1197,7 +1197,7 @@ static bool skip_seccomp_unavailable(const Unit* u, const char* msg) {
static int apply_seccomp(const Unit* u, const ExecContext *c) {
uint32_t negative_action, action;
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
Iterator i;
void *id;
int r;
@@ -1248,7 +1248,7 @@ finish:
}
static int apply_address_families(const Unit* u, const ExecContext *c) {
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
Iterator i;
int r;
@@ -1257,13 +1257,9 @@ static int apply_address_families(const Unit* u, const ExecContext *c) {
if (skip_seccomp_unavailable(u, "RestrictAddressFamilies="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
if (c->address_families_whitelist) {
int af, first = 0, last = 0;
@@ -1360,10 +1356,6 @@ static int apply_address_families(const Unit* u, const ExecContext *c) {
}
}
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
@@ -1372,7 +1364,7 @@ finish:
}
static int apply_memory_deny_write_execute(const Unit* u, const ExecContext *c) {
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
int r;
assert(c);
@@ -1380,13 +1372,9 @@ static int apply_memory_deny_write_execute(const Unit* u, const ExecContext *c)
if (skip_seccomp_unavailable(u, "MemoryDenyWriteExecute="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
r = seccomp_rule_add(
seccomp,
@@ -1406,10 +1394,6 @@ static int apply_memory_deny_write_execute(const Unit* u, const ExecContext *c)
if (r < 0)
goto finish;
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
@@ -1424,7 +1408,7 @@ static int apply_restrict_realtime(const Unit* u, const ExecContext *c) {
SCHED_IDLE,
};
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
unsigned i;
int r, p, max_policy = 0;
@@ -1433,13 +1417,9 @@ static int apply_restrict_realtime(const Unit* u, const ExecContext *c) {
if (skip_seccomp_unavailable(u, "RestrictRealtime="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
/* Determine the highest policy constant we want to allow */
for (i = 0; i < ELEMENTSOF(permitted_policies); i++)
@@ -1483,10 +1463,6 @@ static int apply_restrict_realtime(const Unit* u, const ExecContext *c) {
if (r < 0)
goto finish;
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
@@ -1495,7 +1471,7 @@ finish:
}
static int apply_protect_sysctl(Unit *u, const ExecContext *c) {
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
int r;
assert(c);
@@ -1506,13 +1482,9 @@ static int apply_protect_sysctl(Unit *u, const ExecContext *c) {
if (skip_seccomp_unavailable(u, "ProtectKernelTunables="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
r = seccomp_rule_add(
seccomp,
@@ -1522,10 +1494,6 @@ static int apply_protect_sysctl(Unit *u, const ExecContext *c) {
if (r < 0)
goto finish;
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
@@ -1534,9 +1502,7 @@ finish:
}
static int apply_protect_kernel_modules(Unit *u, const ExecContext *c) {
-
- scmp_filter_ctx *seccomp;
- const char *sys;
+ scmp_filter_ctx seccomp;
int r;
assert(c);
@@ -1546,22 +1512,14 @@ static int apply_protect_kernel_modules(Unit *u, const ExecContext *c) {
if (skip_seccomp_unavailable(u, "ProtectKernelModules="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
r = seccomp_add_syscall_filter_set(seccomp, syscall_filter_sets + SYSCALL_FILTER_SET_MODULE, SCMP_ACT_ERRNO(EPERM));
if (r < 0)
goto finish;
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
@@ -1570,7 +1528,7 @@ finish:
}
static int apply_private_devices(Unit *u, const ExecContext *c) {
- scmp_filter_ctx *seccomp;
+ scmp_filter_ctx seccomp;
int r;
assert(c);
@@ -1580,22 +1538,14 @@ static int apply_private_devices(Unit *u, const ExecContext *c) {
if (skip_seccomp_unavailable(u, "PrivateDevices="))
return 0;
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return -ENOMEM;
-
- r = seccomp_add_secondary_archs(seccomp);
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
if (r < 0)
- goto finish;
+ return r;
r = seccomp_add_syscall_filter_set(seccomp, syscall_filter_sets + SYSCALL_FILTER_SET_RAW_IO, SCMP_ACT_ERRNO(EPERM));
if (r < 0)
goto finish;
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0)
- goto finish;
-
r = seccomp_load(seccomp);
finish:
diff --git a/src/nspawn/nspawn-seccomp.c b/src/nspawn/nspawn-seccomp.c
index 44a0b397ab..03a397d30c 100644
--- a/src/nspawn/nspawn-seccomp.c
+++ b/src/nspawn/nspawn-seccomp.c
@@ -135,15 +135,9 @@ int setup_seccomp(uint64_t cap_list_retain) {
return 0;
}
- seccomp = seccomp_init(SCMP_ACT_ALLOW);
- if (!seccomp)
- return log_oom();
-
- r = seccomp_add_secondary_archs(seccomp);
- if (r < 0) {
- log_error_errno(r, "Failed to add secondary archs to seccomp filter: %m");
- goto finish;
- }
+ r = seccomp_init_conservative(&seccomp, SCMP_ACT_ALLOW);
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate seccomp object: %m");
r = seccomp_add_default_syscall_filter(seccomp, cap_list_retain);
if (r < 0)
@@ -171,12 +165,6 @@ int setup_seccomp(uint64_t cap_list_retain) {
goto finish;
}
- r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
- if (r < 0) {
- log_error_errno(r, "Failed to unset NO_NEW_PRIVS: %m");
- goto finish;
- }
-
r = seccomp_load(seccomp);
if (r < 0) {
log_error_errno(r, "Failed to install seccomp audit filter: %m");
diff --git a/src/shared/seccomp-util.c b/src/shared/seccomp-util.c
index 1d51f3fd1f..0b9fa47c44 100644
--- a/src/shared/seccomp-util.c
+++ b/src/shared/seccomp-util.c
@@ -74,7 +74,34 @@ int seccomp_arch_from_string(const char *n, uint32_t *ret) {
return 0;
}
-int seccomp_add_secondary_archs(scmp_filter_ctx *c) {
+int seccomp_init_conservative(scmp_filter_ctx *ret, uint32_t default_action) {
+ scmp_filter_ctx seccomp;
+ int r;
+
+ /* Much like seccomp_init(), but tries to be a bit more conservative in its defaults: all secondary archs are
+ * added by default, and NNP is turned off. */
+
+ seccomp = seccomp_init(default_action);
+ if (!seccomp)
+ return -ENOMEM;
+
+ r = seccomp_add_secondary_archs(seccomp);
+ if (r < 0)
+ goto finish;
+
+ r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
+ if (r < 0)
+ goto finish;
+
+ *ret = seccomp;
+ return 0;
+
+finish:
+ seccomp_release(seccomp);
+ return r;
+}
+
+int seccomp_add_secondary_archs(scmp_filter_ctx c) {
#if defined(__i386__) || defined(__x86_64__)
int r;
@@ -111,7 +138,6 @@ int seccomp_add_secondary_archs(scmp_filter_ctx *c) {
#endif
return 0;
-
}
static bool is_basic_seccomp_available(void) {
diff --git a/src/shared/seccomp-util.h b/src/shared/seccomp-util.h
index 34fd49c122..2de429a772 100644
--- a/src/shared/seccomp-util.h
+++ b/src/shared/seccomp-util.h
@@ -25,7 +25,9 @@
const char* seccomp_arch_to_string(uint32_t c);
int seccomp_arch_from_string(const char *n, uint32_t *ret);
-int seccomp_add_secondary_archs(scmp_filter_ctx *c);
+int seccomp_init_conservative(scmp_filter_ctx *ret, uint32_t default_action);
+
+int seccomp_add_secondary_archs(scmp_filter_ctx c);
bool is_seccomp_available(void);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-05 22:17:14 +0000