/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #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 … #define SECCOMP_MODE_STRICT … #define SECCOMP_MODE_FILTER … /* Valid operations for seccomp syscall. */ #define SECCOMP_SET_MODE_STRICT … #define SECCOMP_SET_MODE_FILTER … #define SECCOMP_GET_ACTION_AVAIL … #define SECCOMP_GET_NOTIF_SIZES … /* Valid flags for SECCOMP_SET_MODE_FILTER */ #define SECCOMP_FILTER_FLAG_TSYNC … #define SECCOMP_FILTER_FLAG_LOG … #define SECCOMP_FILTER_FLAG_SPEC_ALLOW … #define SECCOMP_FILTER_FLAG_NEW_LISTENER … #define SECCOMP_FILTER_FLAG_TSYNC_ESRCH … /* Received notifications wait in killable state (only respond to fatal signals) */ #define SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV … /* * 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, * as a signed value (so 0x8000000 is negative). * * The ordering ensures that a min_t() over composed return values always * selects the least permissive choice. */ #define SECCOMP_RET_KILL_PROCESS … #define SECCOMP_RET_KILL_THREAD … #define SECCOMP_RET_KILL … #define SECCOMP_RET_TRAP … #define SECCOMP_RET_ERRNO … #define SECCOMP_RET_USER_NOTIF … #define SECCOMP_RET_TRACE … #define SECCOMP_RET_LOG … #define SECCOMP_RET_ALLOW … /* Masks for the return value sections. */ #define SECCOMP_RET_ACTION_FULL … #define SECCOMP_RET_ACTION … #define SECCOMP_RET_DATA … /** * 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 { … }; struct seccomp_notif_sizes { … }; struct seccomp_notif { … }; /* * Valid flags for struct seccomp_notif_resp * * Note, the SECCOMP_USER_NOTIF_FLAG_CONTINUE flag must be used with caution! * If set by the process supervising the syscalls of another process the * syscall will continue. This is problematic because of an inherent TOCTOU. * An attacker can exploit the time while the supervised process is waiting on * a response from the supervising process to rewrite syscall arguments which * are passed as pointers of the intercepted syscall. * It should be absolutely clear that this means that the seccomp notifier * _cannot_ be used to implement a security policy! It should only ever be used * in scenarios where a more privileged process supervises the syscalls of a * lesser privileged process to get around kernel-enforced security * restrictions when the privileged process deems this safe. In other words, * in order to continue a syscall the supervising process should be sure that * another security mechanism or the kernel itself will sufficiently block * syscalls if arguments are rewritten to something unsafe. * * Similar precautions should be applied when stacking SECCOMP_RET_USER_NOTIF * or SECCOMP_RET_TRACE. For SECCOMP_RET_USER_NOTIF filters acting on the * same syscall, the most recently added filter takes precedence. This means * that the new SECCOMP_RET_USER_NOTIF filter can override any * SECCOMP_IOCTL_NOTIF_SEND from earlier filters, essentially allowing all * such filtered syscalls to be executed by sending the response * SECCOMP_USER_NOTIF_FLAG_CONTINUE. Note that SECCOMP_RET_TRACE can equally * be overriden by SECCOMP_USER_NOTIF_FLAG_CONTINUE. */ #define SECCOMP_USER_NOTIF_FLAG_CONTINUE … struct seccomp_notif_resp { … }; #define SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP … /* valid flags for seccomp_notif_addfd */ #define SECCOMP_ADDFD_FLAG_SETFD … #define SECCOMP_ADDFD_FLAG_SEND … /** * struct seccomp_notif_addfd * @id: The ID of the seccomp notification * @flags: SECCOMP_ADDFD_FLAG_* * @srcfd: The local fd number * @newfd: Optional remote FD number if SETFD option is set, otherwise 0. * @newfd_flags: The O_* flags the remote FD should have applied */ struct seccomp_notif_addfd { … }; #define SECCOMP_IOC_MAGIC … #define SECCOMP_IO(nr) … #define SECCOMP_IOR(nr, type) … #define SECCOMP_IOW(nr, type) … #define SECCOMP_IOWR(nr, type) … /* Flags for seccomp notification fd ioctl. */ #define SECCOMP_IOCTL_NOTIF_RECV … #define SECCOMP_IOCTL_NOTIF_SEND … #define SECCOMP_IOCTL_NOTIF_ID_VALID … /* On success, the return value is the remote process's added fd number */ #define SECCOMP_IOCTL_NOTIF_ADDFD … #define SECCOMP_IOCTL_NOTIF_SET_FLAGS … #endif /* _LINUX_SECCOMP_H */
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