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-rw-r--r--src/core/execute.c41
-rw-r--r--src/core/load-fragment.c54
-rw-r--r--src/shared/seccomp-util.c128
-rw-r--r--src/shared/seccomp-util.h32
4 files changed, 155 insertions, 100 deletions
diff --git a/src/core/execute.c b/src/core/execute.c
index e63a12f934..18bb67cda9 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1578,10 +1578,7 @@ finish:
}
static int apply_private_devices(Unit *u, const ExecContext *c) {
- const SystemCallFilterSet *set;
scmp_filter_ctx *seccomp;
- const char *sys;
- bool syscalls_found = false;
int r;
assert(c);
@@ -1599,43 +1596,9 @@ static int apply_private_devices(Unit *u, const ExecContext *c) {
if (r < 0)
goto finish;
- for (set = syscall_filter_sets; set->set_name; set++)
- if (streq(set->set_name, "@raw-io")) {
- syscalls_found = true;
- break;
- }
-
- /* We should never fail here */
- if (!syscalls_found) {
- r = -EOPNOTSUPP;
+ r = seccomp_add_syscall_filter_set(seccomp, syscall_filter_sets + SYSCALL_FILTER_SET_RAW_IO, SCMP_ACT_ERRNO(EPERM));
+ if (r < 0)
goto finish;
- }
-
- NULSTR_FOREACH(sys, set->value) {
- int id;
- bool add = true;
-
-#ifndef __NR_s390_pci_mmio_read
- if (streq(sys, "s390_pci_mmio_read"))
- add = false;
-#endif
-#ifndef __NR_s390_pci_mmio_write
- if (streq(sys, "s390_pci_mmio_write"))
- add = false;
-#endif
-
- if (!add)
- continue;
-
- id = seccomp_syscall_resolve_name(sys);
-
- r = seccomp_rule_add(
- seccomp,
- SCMP_ACT_ERRNO(EPERM),
- id, 0);
- if (r < 0)
- goto finish;
- }
r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
if (r < 0)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 6f68e23340..118b39c1cf 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -2618,6 +2618,7 @@ int config_parse_documentation(const char *unit,
}
#ifdef HAVE_SECCOMP
+
static int syscall_filter_parse_one(
const char *unit,
const char *filename,
@@ -2628,27 +2629,29 @@ static int syscall_filter_parse_one(
bool warn) {
int r;
- if (*t == '@') {
- const SystemCallFilterSet *set;
+ if (t[0] == '@') {
+ const SyscallFilterSet *set;
+ const char *i;
- for (set = syscall_filter_sets; set->set_name; set++)
- if (streq(set->set_name, t)) {
- const char *sys;
+ set = syscall_filter_set_find(t);
+ if (!set) {
+ if (warn)
+ log_syntax(unit, LOG_WARNING, filename, line, 0, "Don't know system call group, ignoring: %s", t);
+ return 0;
+ }
- NULSTR_FOREACH(sys, set->value) {
- r = syscall_filter_parse_one(unit, filename, line, c, invert, sys, false);
- if (r < 0)
- return r;
- }
- break;
- }
+ NULSTR_FOREACH(i, set->value) {
+ r = syscall_filter_parse_one(unit, filename, line, c, invert, i, false);
+ if (r < 0)
+ return r;
+ }
} else {
int id;
id = seccomp_syscall_resolve_name(t);
if (id == __NR_SCMP_ERROR) {
if (warn)
- log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse system call, ignoring: %s", t);
+ log_syntax(unit, LOG_WARNING, filename, line, 0, "Failed to parse system call, ignoring: %s", t);
return 0;
}
@@ -2662,8 +2665,9 @@ static int syscall_filter_parse_one(
if (r < 0)
return log_oom();
} else
- set_remove(c->syscall_filter, INT_TO_PTR(id + 1));
+ (void) set_remove(c->syscall_filter, INT_TO_PTR(id + 1));
}
+
return 0;
}
@@ -2682,8 +2686,7 @@ int config_parse_syscall_filter(
ExecContext *c = data;
Unit *u = userdata;
bool invert = false;
- const char *word, *state;
- size_t l;
+ const char *p;
int r;
assert(filename);
@@ -2722,19 +2725,24 @@ int config_parse_syscall_filter(
}
}
- FOREACH_WORD_QUOTED(word, l, rvalue, state) {
- _cleanup_free_ char *t = NULL;
+ p = rvalue;
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
- t = strndup(word, l);
- if (!t)
+ r = extract_first_word(&p, &word, NULL, 0);
+ if (r == 0)
+ break;
+ if (r == -ENOMEM)
return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
+ break;
+ }
- r = syscall_filter_parse_one(unit, filename, line, c, invert, t, true);
+ r = syscall_filter_parse_one(unit, filename, line, c, invert, word, true);
if (r < 0)
return r;
}
- if (!isempty(state))
- log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
/* Turn on NNP, but only if it wasn't configured explicitly
* before, and only if we are in user mode. */
diff --git a/src/shared/seccomp-util.c b/src/shared/seccomp-util.c
index 8116c7671f..1d51f3fd1f 100644
--- a/src/shared/seccomp-util.c
+++ b/src/shared/seccomp-util.c
@@ -26,6 +26,7 @@
#include "macro.h"
#include "seccomp-util.h"
#include "string-util.h"
+#include "util.h"
const char* seccomp_arch_to_string(uint32_t c) {
@@ -132,28 +133,30 @@ bool is_seccomp_available(void) {
return cached_enabled;
}
-const SystemCallFilterSet syscall_filter_sets[] = {
- {
+const SyscallFilterSet syscall_filter_sets[_SYSCALL_FILTER_SET_MAX] = {
+ [SYSCALL_FILTER_SET_CLOCK] = {
/* Clock */
- .set_name = "@clock",
+ .name = "@clock",
.value =
"adjtimex\0"
"clock_adjtime\0"
"clock_settime\0"
"settimeofday\0"
"stime\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_CPU_EMULATION] = {
/* CPU emulation calls */
- .set_name = "@cpu-emulation",
+ .name = "@cpu-emulation",
.value =
"modify_ldt\0"
"subpage_prot\0"
"switch_endian\0"
"vm86\0"
"vm86old\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_DEBUG] = {
/* Debugging/Performance Monitoring/Tracing */
- .set_name = "@debug",
+ .name = "@debug",
.value =
"lookup_dcookie\0"
"perf_event_open\0"
@@ -161,11 +164,14 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"process_vm_writev\0"
"ptrace\0"
"rtas\0"
+#ifdef __NR_s390_runtime_instr
"s390_runtime_instr\0"
+#endif
"sys_debug_setcontext\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_DEFAULT] = {
/* Default list */
- .set_name = "@default",
+ .name = "@default",
.value =
"execve\0"
"exit\0"
@@ -173,9 +179,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"getrlimit\0" /* make sure processes can query stack size and such */
"rt_sigreturn\0"
"sigreturn\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_IO_EVENT] = {
/* Event loop use */
- .set_name = "@io-event",
+ .name = "@io-event",
.value =
"_newselect\0"
"epoll_create1\0"
@@ -191,9 +198,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"ppoll\0"
"pselect6\0"
"select\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_IPC] = {
/* Message queues, SYSV IPC or other IPC: unusual */
- .set_name = "@ipc",
+ .name = "@ipc",
.value = "ipc\0"
"mq_getsetattr\0"
"mq_notify\0"
@@ -215,23 +223,26 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"shmctl\0"
"shmdt\0"
"shmget\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_KEYRING] = {
/* Keyring */
- .set_name = "@keyring",
+ .name = "@keyring",
.value =
"add_key\0"
"keyctl\0"
"request_key\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_MODULE] = {
/* Kernel module control */
- .set_name = "@module",
+ .name = "@module",
.value =
"delete_module\0"
"finit_module\0"
"init_module\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_MOUNT] = {
/* Mounting */
- .set_name = "@mount",
+ .name = "@mount",
.value =
"chroot\0"
"mount\0"
@@ -239,9 +250,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"pivot_root\0"
"umount2\0"
"umount\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_NETWORK_IO] = {
/* Network or Unix socket IO, should not be needed if not network facing */
- .set_name = "@network-io",
+ .name = "@network-io",
.value =
"accept4\0"
"accept\0"
@@ -264,9 +276,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"socket\0"
"socketcall\0"
"socketpair\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_OBSOLETE] = {
/* Unusual, obsolete or unimplemented, some unknown even to libseccomp */
- .set_name = "@obsolete",
+ .name = "@obsolete",
.value =
"_sysctl\0"
"afs_syscall\0"
@@ -292,9 +305,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"uselib\0"
"ustat\0"
"vserver\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_PRIVILEGED] = {
/* Nice grab-bag of all system calls which need superuser capabilities */
- .set_name = "@privileged",
+ .name = "@privileged",
.value =
"@clock\0"
"@module\0"
@@ -333,9 +347,10 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"swapon\0"
"sysctl\0"
"vhangup\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_PROCESS] = {
/* Process control, execution, namespaces */
- .set_name = "@process",
+ .name = "@process",
.value =
"arch_prctl\0"
"clone\0"
@@ -349,19 +364,66 @@ const SystemCallFilterSet syscall_filter_sets[] = {
"tkill\0"
"unshare\0"
"vfork\0"
- }, {
+ },
+ [SYSCALL_FILTER_SET_RAW_IO] = {
/* Raw I/O ports */
- .set_name = "@raw-io",
+ .name = "@raw-io",
.value =
"ioperm\0"
"iopl\0"
"pciconfig_iobase\0"
"pciconfig_read\0"
"pciconfig_write\0"
+#ifdef __NR_s390_pci_mmio_read
"s390_pci_mmio_read\0"
+#endif
+#ifdef __NR_s390_pci_mmio_write
"s390_pci_mmio_write\0"
- }, {
- .set_name = NULL,
- .value = NULL
- }
+#endif
+ },
};
+
+const SyscallFilterSet *syscall_filter_set_find(const char *name) {
+ unsigned i;
+
+ if (isempty(name) || name[0] != '@')
+ return NULL;
+
+ for (i = 0; i < _SYSCALL_FILTER_SET_MAX; i++)
+ if (streq(syscall_filter_sets[i].name, name))
+ return syscall_filter_sets + i;
+
+ return NULL;
+}
+
+int seccomp_add_syscall_filter_set(scmp_filter_ctx seccomp, const SyscallFilterSet *set, uint32_t action) {
+ const char *sys;
+ int r;
+
+ assert(seccomp);
+ assert(set);
+
+ NULSTR_FOREACH(sys, set->value) {
+ int id;
+
+ if (sys[0] == '@') {
+ const SyscallFilterSet *other;
+
+ other = syscall_filter_set_find(sys);
+ if (!other)
+ return -EINVAL;
+
+ r = seccomp_add_syscall_filter_set(seccomp, other, action);
+ } else {
+ id = seccomp_syscall_resolve_name(sys);
+ if (id == __NR_SCMP_ERROR)
+ return -EINVAL;
+
+ r = seccomp_rule_add(seccomp, action, id, 0);
+ }
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
diff --git a/src/shared/seccomp-util.h b/src/shared/seccomp-util.h
index cca7c17912..34fd49c122 100644
--- a/src/shared/seccomp-util.h
+++ b/src/shared/seccomp-util.h
@@ -29,9 +29,31 @@ int seccomp_add_secondary_archs(scmp_filter_ctx *c);
bool is_seccomp_available(void);
-typedef struct SystemCallFilterSet {
- const char *set_name;
+typedef struct SyscallFilterSet {
+ const char *name;
const char *value;
-} SystemCallFilterSet;
-
-extern const SystemCallFilterSet syscall_filter_sets[];
+} SyscallFilterSet;
+
+enum {
+ SYSCALL_FILTER_SET_CLOCK,
+ SYSCALL_FILTER_SET_CPU_EMULATION,
+ SYSCALL_FILTER_SET_DEBUG,
+ SYSCALL_FILTER_SET_DEFAULT,
+ SYSCALL_FILTER_SET_IO_EVENT,
+ SYSCALL_FILTER_SET_IPC,
+ SYSCALL_FILTER_SET_KEYRING,
+ SYSCALL_FILTER_SET_MODULE,
+ SYSCALL_FILTER_SET_MOUNT,
+ SYSCALL_FILTER_SET_NETWORK_IO,
+ SYSCALL_FILTER_SET_OBSOLETE,
+ SYSCALL_FILTER_SET_PRIVILEGED,
+ SYSCALL_FILTER_SET_PROCESS,
+ SYSCALL_FILTER_SET_RAW_IO,
+ _SYSCALL_FILTER_SET_MAX
+};
+
+extern const SyscallFilterSet syscall_filter_sets[];
+
+const SyscallFilterSet *syscall_filter_set_find(const char *name);
+
+int seccomp_add_syscall_filter_set(scmp_filter_ctx seccomp, const SyscallFilterSet *set, uint32_t action);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-05 09:33:25 +0000