500 lines
		
	
	
		
			15 KiB
		
	
	
	
		
			C
		
	
	
	
			
		
		
	
	
			500 lines
		
	
	
		
			15 KiB
		
	
	
	
		
			C
		
	
	
	
| /*
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|  * Check bpf(BPF_OBJ_GET_INFO_BY_FD) decoding.
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|  *
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|  * Copyright (c) 2018 The strace developers.
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|  * All rights reserved.
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|  *
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|  * Redistribution and use in source and binary forms, with or without
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|  * modification, are permitted provided that the following conditions
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|  * are met:
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|  * 1. Redistributions of source code must retain the above copyright
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|  *    notice, this list of conditions and the following disclaimer.
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|  * 2. Redistributions in binary form must reproduce the above copyright
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|  *    notice, this list of conditions and the following disclaimer in the
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|  *    documentation and/or other materials provided with the distribution.
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|  * 3. The name of the author may not be used to endorse or promote products
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|  *    derived from this software without specific prior written permission.
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|  *
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|  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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|  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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|  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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|  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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|  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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|  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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|  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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|  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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|  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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|  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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|  */
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| 
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| #include "tests.h"
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| 
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| #ifndef CHECK_OBJ_PROG
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| # define CHECK_OBJ_PROG 0
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| #endif
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| 
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| #include <inttypes.h>
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| #include <stddef.h>
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| #include <stdio.h>
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| #include <stdint.h>
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| #include <stdlib.h>
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| #include <unistd.h>
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| #include <sys/sysmacros.h>
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| #include <asm/unistd.h>
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| 
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| #include "print_fields.h"
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| #include "scno.h"
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| 
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| #ifdef HAVE_LINUX_BPF_H
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| # include <linux/bpf.h>
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| #endif
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| 
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| #include "bpf_attr.h"
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| 
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| #include "xlat.h"
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| #include "xlat/bpf_map_flags.h"
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| #include "xlat/bpf_map_types.h"
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| #include "xlat/bpf_prog_types.h"
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| 
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| #define XLAT_MACROS_ONLY
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| #include "xlat/bpf_commands.h"
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| #include "xlat/bpf_op_alu.h"
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| #include "xlat/bpf_op_jmp.h"
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| #include "xlat/bpf_size.h"
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| #include "xlat/bpf_src.h"
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| #include "xlat/ebpf_class.h"
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| #include "xlat/ebpf_mode.h"
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| #include "xlat/ebpf_op_alu.h"
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| #include "xlat/ebpf_regs.h"
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| #include "xlat/ebpf_size.h"
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| 
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| #ifndef HAVE_STRUCT_BPF_INSN
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| struct bpf_insn {
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| 	uint8_t	code;
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| 	uint8_t	dst_reg:4;
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| 	uint8_t	src_reg:4;
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| 	int16_t	off;
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| 	int32_t	imm;
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| };
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| #endif
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| 
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| static const char *errstr;
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| 
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| static long
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| sys_bpf(kernel_ulong_t cmd, void *attr, kernel_ulong_t size)
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| {
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| 	long rc = syscall(__NR_bpf, cmd, attr, size);
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| 	errstr = sprintrc(rc);
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| 	return rc;
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| }
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| 
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| static void
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| print_map_create(void *attr_void, size_t size, long rc)
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| {
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| 	/* struct BPF_MAP_CREATE_struct *attr = attr_void; */
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| 
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| 	printf("bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4"
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| 	       ", value_size=8, max_entries=1");
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| 	if (size > offsetof(struct BPF_MAP_CREATE_struct, map_flags))
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| 		printf(", map_flags=0");
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| 	if (size > offsetof(struct BPF_MAP_CREATE_struct, inner_map_fd))
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| 		printf(", inner_map_fd=0</dev/null>");
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| 	if (size > offsetof(struct BPF_MAP_CREATE_struct, map_name))
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| 		printf(", map_name=\"test_map\"");
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| 	if (size > offsetof(struct BPF_MAP_CREATE_struct, map_ifindex))
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| 		printf(", map_ifindex=0");
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| 	printf("}, %zu) = ", size);
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| 	if (rc >= 0)
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| 		printf("%ld<anon_inode:bpf-map>\n", rc);
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| 	else
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| 		puts(errstr);
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| }
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| 
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| #if CHECK_OBJ_PROG
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| static struct bpf_insn socket_prog[] = {
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| 	{ /* 0 */
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| 		.code    = BPF_ALU64 | BPF_K | BPF_MOV,
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| 		.dst_reg = BPF_REG_1,
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| 		.imm     = 0,
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| 	},
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| 	{ /* 1 */
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| 		.code    = BPF_STX | BPF_W | BPF_MEM,
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| 		.dst_reg = BPF_REG_10,
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| 		.src_reg = BPF_REG_1,
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| 		.off     = -4,
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| 	},
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| 	{ /* 2 */
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| 		.code = BPF_ALU64 | BPF_X | BPF_MOV,
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| 		.dst_reg = BPF_REG_2,
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| 		.src_reg = BPF_REG_10,
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| 	},
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| 	{ /* 3 */
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| 		.code    = BPF_ALU64 | BPF_K | BPF_ADD,
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| 		.dst_reg = BPF_REG_2,
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| 		.imm     = -4,
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| 	},
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| 	{ /* 4 */
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| 		.code    = BPF_LD | BPF_DW | BPF_IMM,
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| 		.dst_reg = BPF_REG_1,
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| 		.src_reg = 1 /* BPF_PSEUDO_MAP_FD */,
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| 		.imm     = 0, /* to be set to map fd */
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| 	},
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| 	{ /* 5 */
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| 		.imm     = 0,
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| 	},
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| 	{ /* 6 */
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| 		.code    = BPF_JMP | BPF_K | BPF_CALL,
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| 		.imm     = 0x1, /* BPF_FUNC_map_lookup_elem */
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| 	},
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| 	{ /* 7 */
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| 		.code    = BPF_ALU64 | BPF_K | BPF_MOV,
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| 		.dst_reg = BPF_REG_0,
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| 		.imm     = 0,
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| 	},
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| 	{ /* 8 */
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| 		.code    = BPF_JMP | BPF_K | BPF_EXIT,
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| 	},
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| };
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| 
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| # if VERBOSE
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| static const char *socket_prog_fmt =
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| 	"[{code=BPF_ALU64|BPF_K|BPF_MOV"
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| 		", dst_reg=BPF_REG_1, src_reg=BPF_REG_0, off=0, imm=0}"
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| 	", {code=BPF_STX|BPF_W|BPF_MEM"
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| 		", dst_reg=BPF_REG_10, src_reg=BPF_REG_1, off=-4, imm=0}"
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| 	", {code=BPF_ALU64|BPF_X|BPF_MOV"
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| 		", dst_reg=BPF_REG_2, src_reg=BPF_REG_10, off=0, imm=0}"
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| 	", {code=BPF_ALU64|BPF_K|BPF_ADD"
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| 		", dst_reg=BPF_REG_2, src_reg=BPF_REG_0, off=0, imm=0xfffffffc}"
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| 	", {code=BPF_LD|BPF_DW|BPF_IMM"
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| 		", dst_reg=BPF_REG_1, src_reg=BPF_REG_1, off=0, imm=%#x}"
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| 	", {code=BPF_LD|BPF_W|BPF_IMM"
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| 		", dst_reg=BPF_REG_0, src_reg=BPF_REG_0, off=0, imm=0}"
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| 	", {code=BPF_JMP|BPF_K|BPF_CALL"
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| 		", dst_reg=BPF_REG_0, src_reg=BPF_REG_0, off=0, imm=0x1}"
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| 	", {code=BPF_ALU64|BPF_K|BPF_MOV"
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| 		", dst_reg=BPF_REG_0, src_reg=BPF_REG_0, off=0, imm=0}"
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| 	", {code=BPF_JMP|BPF_K|BPF_EXIT"
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| 		", dst_reg=BPF_REG_0, src_reg=BPF_REG_0, off=0, imm=0}"
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| 	"]";
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| # endif /* VERBOSE */
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| 
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| static const char *license = "BSD";
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| static char log_buf[4096];
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| 
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| static void
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| print_prog_load(void *attr_void, size_t size, long rc)
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| {
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| 	printf("bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER"
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| 	       ", insn_cnt=%zu, insns=", ARRAY_SIZE(socket_prog));
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| # if VERBOSE
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| 	printf(socket_prog_fmt, socket_prog[4].imm);
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| # else
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| 	printf("%p", socket_prog);
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| # endif
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, license))
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| 		printf(", license=\"BSD\"");
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, log_buf))
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| 		printf(", log_level=42, log_size=%zu, log_buf=\"\"",
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| 		       sizeof(log_buf));
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, kern_version))
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| 		printf(", kern_version=KERNEL_VERSION(57005, 192, 222)");
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, prog_flags))
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| 		printf(", prog_flags=0");
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, prog_name))
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| 		printf(", prog_name=\"test_prog\"");
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, prog_ifindex))
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| 		printf(", prog_ifindex=0");
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| 	if (size > offsetof(struct BPF_PROG_LOAD_struct, expected_attach_type))
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| 		printf(", expected_attach_type=BPF_CGROUP_INET_INGRESS");
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| 	printf("}, %zu) = ", size);
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| 	if (rc >= 0)
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| 		printf("%ld<anon_inode:bpf-prog>\n", rc);
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| 	else
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| 		puts(errstr);
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| }
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| #endif /* CHECK_OBJ_PROG */
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| 
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| static long
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| try_bpf(kernel_ulong_t cmd, void (*printer)(void *attr, size_t size, long rc),
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| 	void *attr, size_t **sizes)
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| {
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| 	long rc;
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| 
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| 	for (rc = -1; **sizes; (*sizes)++) {
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| 		rc = sys_bpf(cmd, attr, **sizes);
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| 		printer(attr, **sizes, rc);
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| 
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| 		if (rc >= 0)
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| 			break;
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| 	}
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| 
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| 	return rc;
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| }
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| 
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| int
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| main(void)
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| {
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| 	struct BPF_MAP_CREATE_struct bpf_map_create_attr = {
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| 		.map_type    = BPF_MAP_TYPE_ARRAY,
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| 		.key_size    = 4,
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| 		.value_size  = 8,
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| 		.max_entries = 1,
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| 		.map_name    = "test_map",
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| 	};
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| 	size_t bpf_map_create_attr_sizes[] = {
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| 		sizeof(bpf_map_create_attr),
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| 		offsetofend(struct BPF_MAP_CREATE_struct, max_entries),
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| 		0,
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| 	};
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| 
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| #if CHECK_OBJ_PROG
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| 	struct BPF_PROG_LOAD_struct bpf_prog_load_attr = {
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| 		.prog_type    = BPF_PROG_TYPE_SOCKET_FILTER,
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| 		.insn_cnt     = ARRAY_SIZE(socket_prog),
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| 		.insns        = (uintptr_t) socket_prog,
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| 		.license      = (uintptr_t) license,
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| 		.log_level    = 42,
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| 		.log_size     = sizeof(log_buf),
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| 		.log_buf      = (uintptr_t) log_buf,
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| 		.kern_version = 0xdeadc0de,
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| 		.prog_name    = "test_prog",
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| 	};
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| 	size_t bpf_prog_load_attr_sizes[] = {
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| 		sizeof(bpf_prog_load_attr),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, prog_name),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, prog_flags),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, kern_version),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, log_buf),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, license),
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| 		offsetofend(struct BPF_PROG_LOAD_struct, insns),
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| 		0,
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| 	};
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| #endif /* CHECK_OBJ_PROG */
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| 
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| 	size_t *bpf_map_create_attr_size = bpf_map_create_attr_sizes;
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| 	int map_fd = try_bpf(BPF_MAP_CREATE, print_map_create,
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| 			     &bpf_map_create_attr, &bpf_map_create_attr_size);
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| 	if (map_fd < 0)
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| 		perror_msg_and_skip("BPF_MAP_CREATE failed");
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| 
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| #if CHECK_OBJ_PROG
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| 	socket_prog[4].imm = map_fd;
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| 
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| 	size_t *bpf_prog_load_attr_size = bpf_prog_load_attr_sizes;
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| 	int prog_fd = try_bpf(BPF_PROG_LOAD, print_prog_load,
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| 			      &bpf_prog_load_attr, &bpf_prog_load_attr_size);
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| 	if (prog_fd < 0)
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| 		perror_msg_and_skip("BPF_PROG_LOAD failed (log: \"%s\")",
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| 				    log_buf);
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| #endif /* CHECK_OBJ_PROG */
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| 
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| 	/*
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| 	 * This has to be a macro, otherwise the compiler complains that
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| 	 * initializer element is not constant.
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| 	 */
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| 	#define  MAP_INFO_SZ (sizeof(*map_info) + 64)
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| 	struct bpf_map_info_struct *map_info = calloc(1, MAP_INFO_SZ);
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| 	struct BPF_OBJ_GET_INFO_BY_FD_struct bpf_map_get_info_attr = {
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| 		.bpf_fd   = map_fd,
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| 		.info_len = MAP_INFO_SZ,
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| 		.info     = (uintptr_t) map_info,
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| 	};
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| 
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| 	int ret = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &bpf_map_get_info_attr,
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| 			  sizeof(bpf_map_get_info_attr));
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| 	if (ret < 0)
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| 		perror_msg_and_skip("BPF_OBJ_GET_INFO_BY_FD map failed");
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| 
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| 	printf("bpf(BPF_OBJ_GET_INFO_BY_FD"
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| 	       ", {info={bpf_fd=%d<anon_inode:bpf-map>, info_len=%zu",
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| 	       map_fd, MAP_INFO_SZ);
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| 	if (bpf_map_get_info_attr.info_len != MAP_INFO_SZ)
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| 		printf(" => %u", bpf_map_get_info_attr.info_len);
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| 
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| 	printf(", info=");
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| #if VERBOSE
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| 	printf("{type=");
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| 	printxval(bpf_map_types, map_info->type, "BPF_MAP_TYPE_???");
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| 	PRINT_FIELD_U(", ", *map_info, id);
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| 	PRINT_FIELD_U(", ", *map_info, key_size);
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| 	PRINT_FIELD_U(", ", *map_info, value_size);
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| 	PRINT_FIELD_U(", ", *map_info, max_entries);
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| 	printf(", map_flags=");
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| 	printflags(bpf_map_flags, map_info->map_flags, "BPF_F_???");
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| 
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| 	if (bpf_map_get_info_attr.info_len >
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| 	    offsetof(struct bpf_map_info_struct, name)) {
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| 		printf(", name=");
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| 		print_quoted_cstring(map_info->name, sizeof(map_info->name));
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| 	}
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| 	if (bpf_map_get_info_attr.info_len >
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| 	    offsetof(struct bpf_map_info_struct, ifindex))
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| 		printf(", ifindex=%u", map_info->ifindex);
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| 	if (bpf_map_get_info_attr.info_len >
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| 	    offsetof(struct bpf_map_info_struct, netns_dev))
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| 		printf(", netns_dev=makedev(%u, %u)",
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| 		       major(map_info->netns_dev), minor(map_info->netns_dev));
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| 	if (bpf_map_get_info_attr.info_len >
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| 	    offsetof(struct bpf_map_info_struct, netns_ino))
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| 		printf(", netns_ino=%" PRIu64, map_info->netns_ino);
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| 	printf("}");
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| #else /* !VERBOSE */
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| 	printf("%p", map_info);
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| #endif /* VERBOSE */
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| 	printf("}}, %zu) = %s\n", sizeof(bpf_map_get_info_attr), errstr);
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| 
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| #if CHECK_OBJ_PROG
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| 	/*
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| 	 * This has to be a macro, otherwise the compiler complains that
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| 	 * initializer element is not constant.
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| 	 */
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| 	#define  PROG_INFO_SZ (sizeof(*prog_info) + 64)
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| 	struct bpf_prog_info_struct *prog_info = calloc(1, PROG_INFO_SZ);
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| 	struct bpf_insn *xlated_prog = tail_alloc(sizeof(*xlated_prog) * 42);
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| 	uint32_t *map_ids = tail_alloc(sizeof(*map_ids) * 2);
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| 	struct BPF_OBJ_GET_INFO_BY_FD_struct bpf_prog_get_info_attr = {
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| 		.bpf_fd   = prog_fd,
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| 		.info_len = PROG_INFO_SZ,
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| 		.info     = (uintptr_t) prog_info,
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| 	};
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| 	size_t old_prog_info_len = PROG_INFO_SZ;
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| 
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| 	for (unsigned int i = 0; i < 4; i++) {
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| 		prog_info->jited_prog_len = 0;
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| 		switch (i) {
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| 		case 1:
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| 			prog_info->xlated_prog_insns =
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| 				(uintptr_t) (xlated_prog + 42);
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| 			prog_info->xlated_prog_len = 336;
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| 			prog_info->map_ids = (uintptr_t) (map_ids + 2);
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| 			prog_info->nr_map_ids = 2;
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| 			break;
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| 		case 2:
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| 			prog_info->xlated_prog_insns = (uintptr_t) xlated_prog;
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| 			/* TODO: check xlated_prog output */
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| 			prog_info->xlated_prog_len = 0;
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| 			prog_info->map_ids = (uintptr_t) map_ids;
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| 			prog_info->nr_map_ids = 0;
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| 			break;
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| 		case 3:
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| 			prog_info->xlated_prog_insns = (uintptr_t) xlated_prog;
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| 			prog_info->xlated_prog_len = 0;
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| 			prog_info->map_ids = (uintptr_t) map_ids;
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| 			prog_info->nr_map_ids = 2;
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| 			break;
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| 		}
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| 
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| 		ret = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &bpf_prog_get_info_attr,
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| 			      sizeof(bpf_prog_get_info_attr));
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| 		if (i != 1 && ret < 0)
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| 			perror_msg_and_skip("BPF_OBJ_GET_INFO_BY_FD"
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| 					    " prog %u failed", i);
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| 
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| 		printf("bpf(BPF_OBJ_GET_INFO_BY_FD"
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| 		       ", {info={bpf_fd=%d<anon_inode:bpf-prog>, info_len=%zu",
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| 		       prog_fd, old_prog_info_len);
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| 		if (!i && bpf_prog_get_info_attr.info_len != PROG_INFO_SZ)
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| 			printf(" => %u", bpf_prog_get_info_attr.info_len);
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| 		old_prog_info_len = bpf_prog_get_info_attr.info_len;
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| 
 | |
| 		printf(", info=");
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| # if VERBOSE
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| 		printf("{type=");
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| 		printxval(bpf_prog_types, prog_info->type, "BPF_PROG_TYPE_???");
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| 		PRINT_FIELD_U(", ", *prog_info, id);
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| 		printf(", tag=");
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| 		print_quoted_hex(prog_info->tag, sizeof(prog_info->tag));
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| 		printf(", jited_prog_len=0");
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| 		if (prog_info->jited_prog_len)
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| 			printf(" => %u", prog_info->jited_prog_len);
 | |
| 		printf(", jited_prog_insns=NULL");
 | |
| 		switch (i) {
 | |
| 		case 0:
 | |
| 			printf(", xlated_prog_len=0");
 | |
| 			if (prog_info->xlated_prog_len)
 | |
| 				printf(" => %u", prog_info->xlated_prog_len);
 | |
| 			printf(", xlated_prog_insns=NULL");
 | |
| 			break;
 | |
| 		case 1:
 | |
| 			printf(", xlated_prog_len=336");
 | |
| 			if (prog_info->xlated_prog_len != 336)
 | |
| 				printf(" => %u", prog_info->xlated_prog_len);
 | |
| 			if (prog_info->xlated_prog_len)
 | |
| 				printf(", xlated_prog_insns=%p", xlated_prog + 42);
 | |
| 			else
 | |
| 				printf(", xlated_prog_insns=[]");
 | |
| 			break;
 | |
| 		case 2:
 | |
| 		case 3:
 | |
| 			printf(", xlated_prog_len=0");
 | |
| 			if (prog_info->xlated_prog_len)
 | |
| 				printf(" => %u", prog_info->xlated_prog_len);
 | |
| 			printf(", xlated_prog_insns=[]");
 | |
| 			break;
 | |
| 		}
 | |
| 
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, load_time))
 | |
| 			printf(", load_time=%" PRIu64, prog_info->load_time);
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, created_by_uid))
 | |
| 			printf(", created_by_uid=%u",
 | |
| 			       prog_info->created_by_uid);
 | |
| 
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, map_ids)) {
 | |
| 			switch (i) {
 | |
| 			case 0:
 | |
| 				printf(", nr_map_ids=0");
 | |
| 				if (prog_info->nr_map_ids)
 | |
| 					printf(" => 1");
 | |
| 				printf(", map_ids=NULL");
 | |
| 				break;
 | |
| 			case 1:
 | |
| 				printf(", nr_map_ids=2, map_ids=%p",
 | |
| 				       map_ids + 2);
 | |
| 				break;
 | |
| 			case 2:
 | |
| 				printf(", nr_map_ids=0");
 | |
| 				if (prog_info->nr_map_ids)
 | |
| 					printf(" => 1");
 | |
| 				printf(", map_ids=[]");
 | |
| 				break;
 | |
| 			case 3:
 | |
| 				printf(", nr_map_ids=2");
 | |
| 				if (prog_info->nr_map_ids != 2)
 | |
| 					printf(" => 1");
 | |
| 				printf(", map_ids=[%u]", map_info->id);
 | |
| 				break;
 | |
| 			}
 | |
| 		}
 | |
| 
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, name))
 | |
| 			printf(", name=\"test_prog\"");
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, ifindex))
 | |
| 			printf(", ifindex=%u", prog_info->ifindex);
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, netns_dev))
 | |
| 			printf(", netns_dev=makedev(%u, %u)",
 | |
| 			       major(prog_info->netns_dev),
 | |
| 			       minor(prog_info->netns_dev));
 | |
| 		if (bpf_prog_get_info_attr.info_len >
 | |
| 		    offsetof(struct bpf_prog_info_struct, netns_ino))
 | |
| 			printf(", netns_ino=%" PRIu64, prog_info->netns_ino);
 | |
| 
 | |
| 		printf("}");
 | |
| # else /* !VERBOSE */
 | |
| 		printf("%p", prog_info);
 | |
| # endif /* VERBOSE */
 | |
| 		printf("}}, %zu) = %s\n",
 | |
| 		       sizeof(bpf_prog_get_info_attr), errstr);
 | |
| 	}
 | |
| #endif /* CHECK_OBJ_PROG */
 | |
| 
 | |
| 	puts("+++ exited with 0 +++");
 | |
| 	return 0;
 | |
| }
 |