485 lines
11 KiB
C
485 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/stack_ptr.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <limits.h>
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#include "bpf_misc.h"
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#define MAX_ENTRIES 11
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struct test_val {
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unsigned int index;
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int foo[MAX_ENTRIES];
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, struct test_val);
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} map_array_48b SEC(".maps");
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SEC("socket")
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__description("PTR_TO_STACK store/load")
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__success __success_unpriv __retval(0xfaceb00c)
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__naked void ptr_to_stack_store_load(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -10; \
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r0 = 0xfaceb00c; \
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*(u64*)(r1 + 2) = r0; \
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r0 = *(u64*)(r1 + 2); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK store/load - bad alignment on off")
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__failure __msg("misaligned stack access off (0x0; 0x0)+-8+2 size 8")
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__failure_unpriv
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__naked void load_bad_alignment_on_off(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -8; \
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r0 = 0xfaceb00c; \
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*(u64*)(r1 + 2) = r0; \
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r0 = *(u64*)(r1 + 2); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK store/load - bad alignment on reg")
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__failure __msg("misaligned stack access off (0x0; 0x0)+-10+8 size 8")
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__failure_unpriv
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__naked void load_bad_alignment_on_reg(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -10; \
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r0 = 0xfaceb00c; \
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*(u64*)(r1 + 8) = r0; \
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r0 = *(u64*)(r1 + 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK store/load - out of bounds low")
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__failure __msg("invalid write to stack R1 off=-79992 size=8")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void load_out_of_bounds_low(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -80000; \
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r0 = 0xfaceb00c; \
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*(u64*)(r1 + 8) = r0; \
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r0 = *(u64*)(r1 + 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK store/load - out of bounds high")
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__failure __msg("invalid write to stack R1 off=0 size=8")
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__failure_unpriv
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__naked void load_out_of_bounds_high(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -8; \
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r0 = 0xfaceb00c; \
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*(u64*)(r1 + 8) = r0; \
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r0 = *(u64*)(r1 + 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 1")
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__success __success_unpriv __retval(42)
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__naked void to_stack_check_high_1(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -1; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 2")
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__success __success_unpriv __retval(42)
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__naked void to_stack_check_high_2(void)
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{
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asm volatile (" \
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r1 = r10; \
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r0 = 42; \
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*(u8*)(r1 - 1) = r0; \
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r0 = *(u8*)(r1 - 1); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 3")
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__success __failure_unpriv
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__retval(42)
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__naked void to_stack_check_high_3(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += 0; \
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r0 = 42; \
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*(u8*)(r1 - 1) = r0; \
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r0 = *(u8*)(r1 - 1); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 4")
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__failure __msg("invalid write to stack R1 off=0 size=1")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_high_4(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += 0; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 5")
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__failure __msg("invalid write to stack R1")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_high_5(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" :
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: __imm_const(__imm_0, (1 << 29) - 1)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 6")
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__failure __msg("invalid write to stack")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_high_6(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 + %[shrt_max]) = r0; \
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r0 = *(u8*)(r1 + %[shrt_max]); \
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exit; \
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" :
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: __imm_const(__imm_0, (1 << 29) - 1),
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__imm_const(shrt_max, SHRT_MAX)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check high 7")
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__failure __msg("fp pointer offset")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_high_7(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 + %[shrt_max]) = r0; \
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r0 = *(u8*)(r1 + %[shrt_max]); \
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exit; \
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" :
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: __imm_const(__imm_0, (1 << 29) - 1),
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__imm_const(shrt_max, SHRT_MAX)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 1")
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__success __success_unpriv __retval(42)
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__naked void to_stack_check_low_1(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -512; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 2")
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__success __failure_unpriv
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__retval(42)
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__naked void to_stack_check_low_2(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -513; \
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r0 = 42; \
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*(u8*)(r1 + 1) = r0; \
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r0 = *(u8*)(r1 + 1); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 3")
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__failure __msg("invalid write to stack R1 off=-513 size=1")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_low_3(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -513; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 4")
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__failure __msg("math between fp pointer")
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__failure_unpriv
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__naked void to_stack_check_low_4(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[int_min]; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" :
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: __imm_const(int_min, INT_MIN)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 5")
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__failure __msg("invalid write to stack")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_low_5(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" :
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: __imm_const(__imm_0, -((1 << 29) - 1))
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 6")
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__failure __msg("invalid write to stack")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_low_6(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 %[shrt_min]) = r0; \
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r0 = *(u8*)(r1 %[shrt_min]); \
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exit; \
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" :
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: __imm_const(__imm_0, -((1 << 29) - 1)),
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__imm_const(shrt_min, SHRT_MIN)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK check low 7")
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__failure __msg("fp pointer offset")
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__msg_unpriv("R1 stack pointer arithmetic goes out of range")
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__naked void to_stack_check_low_7(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += %[__imm_0]; \
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r1 += %[__imm_0]; \
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r0 = 42; \
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*(u8*)(r1 %[shrt_min]) = r0; \
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r0 = *(u8*)(r1 %[shrt_min]); \
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exit; \
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" :
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: __imm_const(__imm_0, -((1 << 29) - 1)),
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__imm_const(shrt_min, SHRT_MIN)
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: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK mixed reg/k, 1")
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__success __success_unpriv __retval(42)
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__naked void stack_mixed_reg_k_1(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -3; \
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r2 = -3; \
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r1 += r2; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK mixed reg/k, 2")
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__success __success_unpriv __retval(42)
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__naked void stack_mixed_reg_k_2(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r10 - 8) = r0; \
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r0 = 0; \
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*(u64*)(r10 - 16) = r0; \
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r1 = r10; \
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r1 += -3; \
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r2 = -3; \
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r1 += r2; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r5 = r10; \
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r0 = *(u8*)(r5 - 6); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK mixed reg/k, 3")
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__success __success_unpriv __retval(-3)
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__naked void stack_mixed_reg_k_3(void)
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{
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asm volatile (" \
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r1 = r10; \
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r1 += -3; \
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r2 = -3; \
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r1 += r2; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = r2; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("PTR_TO_STACK reg")
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__success __success_unpriv __retval(42)
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__naked void ptr_to_stack_reg(void)
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{
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asm volatile (" \
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r1 = r10; \
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r2 = -3; \
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r1 += r2; \
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r0 = 42; \
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*(u8*)(r1 + 0) = r0; \
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r0 = *(u8*)(r1 + 0); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("stack pointer arithmetic")
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__success __success_unpriv __retval(0)
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__naked void stack_pointer_arithmetic(void)
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{
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asm volatile (" \
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r1 = 4; \
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goto l0_%=; \
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l0_%=: r7 = r10; \
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r7 += -10; \
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r7 += -10; \
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r2 = r7; \
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r2 += r1; \
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r0 = 0; \
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*(u32*)(r2 + 4) = r0; \
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r2 = r7; \
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r2 += 8; \
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r0 = 0; \
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*(u32*)(r2 + 4) = r0; \
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tc")
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__description("store PTR_TO_STACK in R10 to array map using BPF_B")
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__success __retval(42)
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__naked void array_map_using_bpf_b(void)
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{
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asm volatile (" \
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/* Load pointer to map. */ \
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r2 = r10; \
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r2 += -8; \
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r1 = 0; \
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*(u64*)(r2 + 0) = r1; \
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r1 = %[map_array_48b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 != 0 goto l0_%=; \
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r0 = 2; \
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exit; \
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l0_%=: r1 = r0; \
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/* Copy R10 to R9. */ \
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r9 = r10; \
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/* Pollute other registers with unaligned values. */\
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r2 = -1; \
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r3 = -1; \
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r4 = -1; \
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r5 = -1; \
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r6 = -1; \
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r7 = -1; \
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r8 = -1; \
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/* Store both R9 and R10 with BPF_B and read back. */\
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*(u8*)(r1 + 0) = r10; \
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r2 = *(u8*)(r1 + 0); \
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*(u8*)(r1 + 0) = r9; \
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r3 = *(u8*)(r1 + 0); \
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/* Should read back as same value. */ \
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if r2 == r3 goto l1_%=; \
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r0 = 1; \
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exit; \
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l1_%=: r0 = 42; \
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exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_array_48b)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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