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✏️ seccomp.h

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/* 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	0 /* seccomp is not in use. */
#define SECCOMP_MODE_STRICT	1 /* uses hard-coded filter. */
#define SECCOMP_MODE_FILTER	2 /* uses user-supplied filter. */

/* Valid operations for seccomp syscall. */
#define SECCOMP_SET_MODE_STRICT		0
#define SECCOMP_SET_MODE_FILTER		1
#define SECCOMP_GET_ACTION_AVAIL	2

/* Valid flags for SECCOMP_SET_MODE_FILTER */
#define SECCOMP_FILTER_FLAG_TSYNC	(1UL << 0)
#define SECCOMP_FILTER_FLAG_LOG		(1UL << 1)
#define SECCOMP_FILTER_FLAG_SPEC_ALLOW	(1UL << 2)

/*
 * 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 0x80000000U /* kill the process */
#define SECCOMP_RET_KILL_THREAD	 0x00000000U /* kill the thread */
#define SECCOMP_RET_KILL	 SECCOMP_RET_KILL_THREAD
#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_LOG		 0x7ffc0000U /* allow after logging */
#define SECCOMP_RET_ALLOW	 0x7fff0000U /* allow */

/* Masks for the return value sections. */
#define SECCOMP_RET_ACTION_FULL	0xffff0000U
#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 */

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✏️ seccomp.h