// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/bounds.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, long long);
__type(value, long long);
} map_hash_8b SEC(".maps");
SEC("socket")
__description("subtraction bounds (map value) variant 1")
__failure __msg("R0 max value is outside of the allowed memory range")
__failure_unpriv
__naked void bounds_map_value_variant_1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = *(u8*)(r0 + 0); \
if r1 > 0xff goto l0_%=; \
r3 = *(u8*)(r0 + 1); \
if r3 > 0xff goto l0_%=; \
r1 -= r3; \
r1 >>= 56; \
r0 += r1; \
r0 = *(u8*)(r0 + 0); \
exit; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("subtraction bounds (map value) variant 2")
__failure
__msg("R0 min value is negative, either use unsigned index or do a if (index >=0) check.")
__msg_unpriv("R1 has unknown scalar with mixed signed bounds")
__naked void bounds_map_value_variant_2(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = *(u8*)(r0 + 0); \
if r1 > 0xff goto l0_%=; \
r3 = *(u8*)(r0 + 1); \
if r3 > 0xff goto l0_%=; \
r1 -= r3; \
r0 += r1; \
r0 = *(u8*)(r0 + 0); \
exit; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("check subtraction on pointers for unpriv")
__success __failure_unpriv __msg_unpriv("R9 pointer -= pointer prohibited")
__retval(0)
__naked void subtraction_on_pointers_for_unpriv(void)
{
asm volatile (" \
r0 = 0; \
r1 = %[map_hash_8b] ll; \
r2 = r10; \
r2 += -8; \
r6 = 9; \
*(u64*)(r2 + 0) = r6; \
call %[bpf_map_lookup_elem]; \
r9 = r10; \
r9 -= r0; \
r1 = %[map_hash_8b] ll; \
r2 = r10; \
r2 += -8; \
r6 = 0; \
*(u64*)(r2 + 0) = r6; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: *(u64*)(r0 + 0) = r9; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check based on zero-extended MOV")
__success __success_unpriv __retval(0)
__naked void based_on_zero_extended_mov(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r2 = 0x0000'0000'ffff'ffff */ \
w2 = 0xffffffff; \
/* r2 = 0 */ \
r2 >>= 32; \
/* no-op */ \
r0 += r2; \
/* access at offset 0 */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check based on sign-extended MOV. test1")
__failure __msg("map_value pointer and 4294967295")
__failure_unpriv
__naked void on_sign_extended_mov_test1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r2 = 0xffff'ffff'ffff'ffff */ \
r2 = 0xffffffff; \
/* r2 = 0xffff'ffff */ \
r2 >>= 32; \
/* r0 = <oob pointer> */ \
r0 += r2; \
/* access to OOB pointer */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check based on sign-extended MOV. test2")
__failure __msg("R0 min value is outside of the allowed memory range")
__failure_unpriv
__naked void on_sign_extended_mov_test2(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r2 = 0xffff'ffff'ffff'ffff */ \
r2 = 0xffffffff; \
/* r2 = 0xfff'ffff */ \
r2 >>= 36; \
/* r0 = <oob pointer> */ \
r0 += r2; \
/* access to OOB pointer */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("tc")
__description("bounds check based on reg_off + var_off + insn_off. test1")
__failure __msg("value_size=8 off=1073741825")
__naked void var_off_insn_off_test1(void)
{
asm volatile (" \
r6 = *(u32*)(r1 + %[__sk_buff_mark]); \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r6 &= 1; \
r6 += %[__imm_0]; \
r0 += r6; \
r0 += %[__imm_0]; \
l0_%=: r0 = *(u8*)(r0 + 3); \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm_const(__imm_0, (1 << 29) - 1),
__imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
: __clobber_all);
}
SEC("tc")
__description("bounds check based on reg_off + var_off + insn_off. test2")
__failure __msg("value 1073741823")
__naked void var_off_insn_off_test2(void)
{
asm volatile (" \
r6 = *(u32*)(r1 + %[__sk_buff_mark]); \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r6 &= 1; \
r6 += %[__imm_0]; \
r0 += r6; \
r0 += %[__imm_1]; \
l0_%=: r0 = *(u8*)(r0 + 3); \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm_const(__imm_0, (1 << 30) - 1),
__imm_const(__imm_1, (1 << 29) - 1),
__imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
: __clobber_all);
}
SEC("socket")
__description("bounds check after truncation of non-boundary-crossing range")
__success __success_unpriv __retval(0)
__naked void of_non_boundary_crossing_range(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r1 = [0x00, 0xff] */ \
r1 = *(u8*)(r0 + 0); \
r2 = 1; \
/* r2 = 0x10'0000'0000 */ \
r2 <<= 36; \
/* r1 = [0x10'0000'0000, 0x10'0000'00ff] */ \
r1 += r2; \
/* r1 = [0x10'7fff'ffff, 0x10'8000'00fe] */ \
r1 += 0x7fffffff; \
/* r1 = [0x00, 0xff] */ \
w1 -= 0x7fffffff; \
/* r1 = 0 */ \
r1 >>= 8; \
/* no-op */ \
r0 += r1; \
/* access at offset 0 */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check after truncation of boundary-crossing range (1)")
__failure
/* not actually fully unbounded, but the bound is very high */
__msg("value -4294967168 makes map_value pointer be out of bounds")
__failure_unpriv
__naked void of_boundary_crossing_range_1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r1 = [0x00, 0xff] */ \
r1 = *(u8*)(r0 + 0); \
r1 += %[__imm_0]; \
/* r1 = [0xffff'ff80, 0x1'0000'007f] */ \
r1 += %[__imm_0]; \
/* r1 = [0xffff'ff80, 0xffff'ffff] or \
* [0x0000'0000, 0x0000'007f] \
*/ \
w1 += 0; \
r1 -= %[__imm_0]; \
/* r1 = [0x00, 0xff] or \
* [0xffff'ffff'0000'0080, 0xffff'ffff'ffff'ffff]\
*/ \
r1 -= %[__imm_0]; \
/* error on OOB pointer computation */ \
r0 += r1; \
/* exit */ \
r0 = 0; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm_const(__imm_0, 0xffffff80 >> 1)
: __clobber_all);
}
SEC("socket")
__description("bounds check after truncation of boundary-crossing range (2)")
__failure __msg("value -4294967168 makes map_value pointer be out of bounds")
__failure_unpriv
__naked void of_boundary_crossing_range_2(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r1 = [0x00, 0xff] */ \
r1 = *(u8*)(r0 + 0); \
r1 += %[__imm_0]; \
/* r1 = [0xffff'ff80, 0x1'0000'007f] */ \
r1 += %[__imm_0]; \
/* r1 = [0xffff'ff80, 0xffff'ffff] or \
* [0x0000'0000, 0x0000'007f] \
* difference to previous test: truncation via MOV32\
* instead of ALU32. \
*/ \
w1 = w1; \
r1 -= %[__imm_0]; \
/* r1 = [0x00, 0xff] or \
* [0xffff'ffff'0000'0080, 0xffff'ffff'ffff'ffff]\
*/ \
r1 -= %[__imm_0]; \
/* error on OOB pointer computation */ \
r0 += r1; \
/* exit */ \
r0 = 0; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm_const(__imm_0, 0xffffff80 >> 1)
: __clobber_all);
}
SEC("socket")
__description("bounds check after wrapping 32-bit addition")
__success __success_unpriv __retval(0)
__naked void after_wrapping_32_bit_addition(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r1 = 0x7fff'ffff */ \
r1 = 0x7fffffff; \
/* r1 = 0xffff'fffe */ \
r1 += 0x7fffffff; \
/* r1 = 0 */ \
w1 += 2; \
/* no-op */ \
r0 += r1; \
/* access at offset 0 */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check after shift with oversized count operand")
__failure __msg("R0 max value is outside of the allowed memory range")
__failure_unpriv
__naked void shift_with_oversized_count_operand(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = 32; \
r1 = 1; \
/* r1 = (u32)1 << (u32)32 = ? */ \
w1 <<= w2; \
/* r1 = [0x0000, 0xffff] */ \
r1 &= 0xffff; \
/* computes unknown pointer, potentially OOB */ \
r0 += r1; \
/* potentially OOB access */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check after right shift of maybe-negative number")
__failure __msg("R0 unbounded memory access")
__failure_unpriv
__naked void shift_of_maybe_negative_number(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
/* r1 = [0x00, 0xff] */ \
r1 = *(u8*)(r0 + 0); \
/* r1 = [-0x01, 0xfe] */ \
r1 -= 1; \
/* r1 = 0 or 0xff'ffff'ffff'ffff */ \
r1 >>= 8; \
/* r1 = 0 or 0xffff'ffff'ffff */ \
r1 >>= 8; \
/* computes unknown pointer, potentially OOB */ \
r0 += r1; \
/* potentially OOB access */ \
r0 = *(u8*)(r0 + 0); \
l0_%=: /* exit */ \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check after 32-bit right shift with 64-bit input")
__failure __msg("math between map_value pointer and 4294967294 is not allowed")
__failure_unpriv
__naked void shift_with_64_bit_input(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = 2; \
/* r1 = 1<<32 */ \
r1 <<= 31; \
/* r1 = 0 (NOT 2!) */ \
w1 >>= 31; \
/* r1 = 0xffff'fffe (NOT 0!) */ \
w1 -= 2; \
/* error on computing OOB pointer */ \
r0 += r1; \
/* exit */ \
r0 = 0; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check map access with off+size signed 32bit overflow. test1")
__failure __msg("map_value pointer and 2147483646")
__failure_unpriv
__naked void size_signed_32bit_overflow_test1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r0 += 0x7ffffffe; \
r0 = *(u64*)(r0 + 0); \
goto l1_%=; \
l1_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check map access with off+size signed 32bit overflow. test2")
__failure __msg("pointer offset 1073741822")
__msg_unpriv("R0 pointer arithmetic of map value goes out of range")
__naked void size_signed_32bit_overflow_test2(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r0 += 0x1fffffff; \
r0 += 0x1fffffff; \
r0 += 0x1fffffff; \
r0 = *(u64*)(r0 + 0); \
goto l1_%=; \
l1_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check map access with off+size signed 32bit overflow. test3")
__failure __msg("pointer offset -1073741822")
__msg_unpriv("R0 pointer arithmetic of map value goes out of range")
__naked void size_signed_32bit_overflow_test3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r0 -= 0x1fffffff; \
r0 -= 0x1fffffff; \
r0 = *(u64*)(r0 + 2); \
goto l1_%=; \
l1_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check map access with off+size signed 32bit overflow. test4")
__failure __msg("map_value pointer and 1000000000000")
__failure_unpriv
__naked void size_signed_32bit_overflow_test4(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = 1000000; \
r1 *= 1000000; \
r0 += r1; \
r0 = *(u64*)(r0 + 2); \
goto l1_%=; \
l1_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check mixed 32bit and 64bit arithmetic. test1")
__success __failure_unpriv __msg_unpriv("R0 invalid mem access 'scalar'")
__retval(0)
__naked void _32bit_and_64bit_arithmetic_test1(void)
{
asm volatile (" \
r0 = 0; \
r1 = -1; \
r1 <<= 32; \
r1 += 1; \
/* r1 = 0xffffFFFF00000001 */ \
if w1 > 1 goto l0_%=; \
/* check ALU64 op keeps 32bit bounds */ \
r1 += 1; \
if w1 > 2 goto l0_%=; \
goto l1_%=; \
l0_%=: /* invalid ldx if bounds are lost above */ \
r0 = *(u64*)(r0 - 1); \
l1_%=: exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("bounds check mixed 32bit and 64bit arithmetic. test2")
__success __failure_unpriv __msg_unpriv("R0 invalid mem access 'scalar'")
__retval(0)
__naked void _32bit_and_64bit_arithmetic_test2(void)
{
asm volatile (" \
r0 = 0; \
r1 = -1; \
r1 <<= 32; \
r1 += 1; \
/* r1 = 0xffffFFFF00000001 */ \
r2 = 3; \
/* r1 = 0x2 */ \
w1 += 1; \
/* check ALU32 op zero extends 64bit bounds */ \
if r1 > r2 goto l0_%=; \
goto l1_%=; \
l0_%=: /* invalid ldx if bounds are lost above */ \
r0 = *(u64*)(r0 - 1); \
l1_%=: exit; \
" ::: __clobber_all);
}
SEC("tc")
__description("assigning 32bit bounds to 64bit for wA = 0, wB = wA")
__success __retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void for_wa_0_wb_wa(void)
{
asm volatile (" \
r8 = *(u32*)(r1 + %[__sk_buff_data_end]); \
r7 = *(u32*)(r1 + %[__sk_buff_data]); \
w9 = 0; \
w2 = w9; \
r6 = r7; \
r6 += r2; \
r3 = r6; \
r3 += 8; \
if r3 > r8 goto l0_%=; \
r5 = *(u32*)(r6 + 0); \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg = 0, reg xor 1")
__success __failure_unpriv
__msg_unpriv("R0 min value is outside of the allowed memory range")
__retval(0)
__naked void reg_0_reg_xor_1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = 0; \
r1 ^= 1; \
if r1 != 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg32 = 0, reg32 xor 1")
__success __failure_unpriv
__msg_unpriv("R0 min value is outside of the allowed memory range")
__retval(0)
__naked void reg32_0_reg32_xor_1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: w1 = 0; \
w1 ^= 1; \
if w1 != 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg = 2, reg xor 3")
__success __failure_unpriv
__msg_unpriv("R0 min value is outside of the allowed memory range")
__retval(0)
__naked void reg_2_reg_xor_3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = 2; \
r1 ^= 3; \
if r1 > 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg = any, reg xor 3")
__failure __msg("invalid access to map value")
__msg_unpriv("invalid access to map value")
__naked void reg_any_reg_xor_3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = *(u64*)(r0 + 0); \
r1 ^= 3; \
if r1 != 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg32 = any, reg32 xor 3")
__failure __msg("invalid access to map value")
__msg_unpriv("invalid access to map value")
__naked void reg32_any_reg32_xor_3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = *(u64*)(r0 + 0); \
w1 ^= 3; \
if w1 != 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg > 0, reg xor 3")
__success __failure_unpriv
__msg_unpriv("R0 min value is outside of the allowed memory range")
__retval(0)
__naked void reg_0_reg_xor_3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = *(u64*)(r0 + 0); \
if r1 <= 0 goto l1_%=; \
r1 ^= 3; \
if r1 >= 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds check for reg32 > 0, reg32 xor 3")
__success __failure_unpriv
__msg_unpriv("R0 min value is outside of the allowed memory range")
__retval(0)
__naked void reg32_0_reg32_xor_3(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 != 0 goto l0_%=; \
exit; \
l0_%=: r1 = *(u64*)(r0 + 0); \
if w1 <= 0 goto l1_%=; \
w1 ^= 3; \
if w1 >= 0 goto l1_%=; \
r0 = *(u64*)(r0 + 8); \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds checks after 32-bit truncation. test 1")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0)
__naked void _32_bit_truncation_test_1(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = *(u32*)(r0 + 0); \
/* This used to reduce the max bound to 0x7fffffff */\
if r1 == 0 goto l1_%=; \
if r1 > 0x7fffffff goto l0_%=; \
l1_%=: r0 = 0; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("bounds checks after 32-bit truncation. test 2")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0)
__naked void _32_bit_truncation_test_2(void)
{
asm volatile (" \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = *(u32*)(r0 + 0); \
if r1 s< 1 goto l1_%=; \
if w1 s< 0 goto l0_%=; \
l1_%=: r0 = 0; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("xdp")
__description("bound check with JMP_JLT for crossing 64-bit signed boundary")
__success __retval(0)
__naked void crossing_64_bit_signed_boundary_1(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[xdp_md_data]); \
r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
r1 = r2; \
r1 += 1; \
if r1 > r3 goto l0_%=; \
r1 = *(u8*)(r2 + 0); \
r0 = 0x7fffffffffffff10 ll; \
r1 += r0; \
r0 = 0x8000000000000000 ll; \
l1_%=: r0 += 1; \
/* r1 unsigned range is [0x7fffffffffffff10, 0x800000000000000f] */\
if r0 < r1 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
: __clobber_all);
}
SEC("xdp")
__description("bound check with JMP_JSLT for crossing 64-bit signed boundary")
__success __retval(0)
__naked void crossing_64_bit_signed_boundary_2(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[xdp_md_data]); \
r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
r1 = r2; \
r1 += 1; \
if r1 > r3 goto l0_%=; \
r1 = *(u8*)(r2 + 0); \
r0 = 0x7fffffffffffff10 ll; \
r1 += r0; \
r2 = 0x8000000000000fff ll; \
r0 = 0x8000000000000000 ll; \
l1_%=: r0 += 1; \
if r0 s> r2 goto l0_%=; \
/* r1 signed range is [S64_MIN, S64_MAX] */ \
if r0 s< r1 goto l1_%=; \
r0 = 1; \
exit; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
: __clobber_all);
}
SEC("xdp")
__description("bound check for loop upper bound greater than U32_MAX")
__success __retval(0)
__naked void bound_greater_than_u32_max(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[xdp_md_data]); \
r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
r1 = r2; \
r1 += 1; \
if r1 > r3 goto l0_%=; \
r1 = *(u8*)(r2 + 0); \
r0 = 0x100000000 ll; \
r1 += r0; \
r0 = 0x100000000 ll; \
l1_%=: r0 += 1; \
if r0 < r1 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
: __clobber_all);
}
SEC("xdp")
__description("bound check with JMP32_JLT for crossing 32-bit signed boundary")
__success __retval(0)
__naked void crossing_32_bit_signed_boundary_1(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[xdp_md_data]); \
r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
r1 = r2; \
r1 += 1; \
if r1 > r3 goto l0_%=; \
r1 = *(u8*)(r2 + 0); \
w0 = 0x7fffff10; \
w1 += w0; \
w0 = 0x80000000; \
l1_%=: w0 += 1; \
/* r1 unsigned range is [0, 0x8000000f] */ \
if w0 < w1 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
: __clobber_all);
}
SEC("xdp")
__description("bound check with JMP32_JSLT for crossing 32-bit signed boundary")
__success __retval(0)
__naked void crossing_32_bit_signed_boundary_2(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[xdp_md_data]); \
r3 = *(u32*)(r1 + %[xdp_md_data_end]); \
r1 = r2; \
r1 += 1; \
if r1 > r3 goto l0_%=; \
r1 = *(u8*)(r2 + 0); \
w0 = 0x7fffff10; \
w1 += w0; \
w2 = 0x80000fff; \
w0 = 0x80000000; \
l1_%=: w0 += 1; \
if w0 s> w2 goto l0_%=; \
/* r1 signed range is [S32_MIN, S32_MAX] */ \
if w0 s< w1 goto l1_%=; \
r0 = 1; \
exit; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
__imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end))
: __clobber_all);
}
char _license[] SEC("license") = "GPL";