execute: support syscall filtering using seccomp filters

[elogind.git] / src / shared / linux / seccomp.h

diff --git a/src/shared/linux/seccomp.h b/src/shared/linux/seccomp.h
new file mode 100644 (file)
index 0000000..9c03683
--- /dev/null
+++ b/src/shared/linux/seccomp.h
@@ -0,0 +1,47 @@
+#ifndef _LINUX_SECCOMP_H
+#define _LINUX_SECCOMP_H
+
+
+#include <linux/types.h>
+
+
+/* Valid values for seccomp.mode and prctl(PR_SET_SECCOMP, <mode>) */
+#define SECCOMP_MODE_DISABLED  0 /* seccomp is not in use. */
+#define SECCOMP_MODE_STRICT    1 /* uses hard-coded filter. */
+#define SECCOMP_MODE_FILTER    2 /* uses user-supplied filter. */
+
+/*
+ * All BPF programs must return a 32-bit value.
+ * The bottom 16-bits are for optional return data.
+ * The upper 16-bits are ordered from least permissive values to most.
+ *
+ * The ordering ensures that a min_t() over composed return values always
+ * selects the least permissive choice.
+ */
+#define SECCOMP_RET_KILL       0x00000000U /* kill the task immediately */
+#define SECCOMP_RET_TRAP       0x00030000U /* disallow and force a SIGSYS */
+#define SECCOMP_RET_ERRNO      0x00050000U /* returns an errno */
+#define SECCOMP_RET_TRACE      0x7ff00000U /* pass to a tracer or disallow */
+#define SECCOMP_RET_ALLOW      0x7fff0000U /* allow */
+
+/* Masks for the return value sections. */
+#define SECCOMP_RET_ACTION     0x7fff0000U
+#define SECCOMP_RET_DATA       0x0000ffffU
+
+/**
+ * struct seccomp_data - the format the BPF program executes over.
+ * @nr: the system call number
+ * @arch: indicates system call convention as an AUDIT_ARCH_* value
+ *        as defined in <linux/audit.h>.
+ * @instruction_pointer: at the time of the system call.
+ * @args: up to 6 system call arguments always stored as 64-bit values
+ *        regardless of the architecture.
+ */
+struct seccomp_data {
+       int nr;
+       __u32 arch;
+       __u64 instruction_pointer;
+       __u64 args[6];
+};
+
+#endif /* _LINUX_SECCOMP_H */