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__u32 arch; __u64 instruction_pointer; __u64 args[6]; }; struct seccomp_notif_sizes { __u16 seccomp_notif; __u16 seccomp_notif_resp; __u16 seccomp_data; }; struct seccomp_notif { __u64 id; __u32 pid; __u32 flags; struct seccomp_data data; }; /* * 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 (1UL << 0) struct seccomp_notif_resp { __u64 id; __s64 val; __s32 error; __u32 flags; }; #define SECCOMP_IOC_MAGIC '!' #define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr) #define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type) #define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type) #define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type) /* Flags for seccomp notification fd ioctl. */ #define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif) #define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \ struct seccomp_notif_resp) #define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64) #endif /* _LINUX_SECCOMP_H */