#include <linux/bpf.h>
#include <../../../include/linux/filter.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
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("exit")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("exit")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("if r1 != 0x0 goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("r0 = 0")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("if w1 != 0x0 goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("r0 = 0")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("if r1 > 0x0 goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("r0 = 0")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("if r1 >= 0x0 goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("r0 = 0")
#endif
__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 __success_unpriv
__retval(0)
#ifdef SPEC_V1
__xlated_unpriv("if w1 >= 0x0 goto pc+2")
__xlated_unpriv("nospec")
__xlated_unpriv("goto pc-1")
__xlated_unpriv("r0 = 0")
#endif
__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 check for non const xor src dst")
__success __log_level(2)
__msg("5: (af) r0 ^= r6 ; R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=431,var_off=(0x0; 0x1af))")
__naked void non_const_xor_src_dst(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r6 &= 0xaf; \
r0 &= 0x1a0; \
r0 ^= r6; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds check for non const or src dst")
__success __log_level(2)
__msg("5: (4f) r0 |= r6 ; R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=431,var_off=(0x0; 0x1af))")
__naked void non_const_or_src_dst(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r6 &= 0xaf; \
r0 &= 0x1a0; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds check for non const mul regs")
__success __log_level(2)
__msg("5: (2f) r0 *= r6 ; R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=3825,var_off=(0x0; 0xfff))")
__naked void non_const_mul_regs(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r6 &= 0xff; \
r0 &= 0x0f; \
r0 *= r6; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm(bpf_get_prandom_u32)
: __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)
__flag(BPF_F_TEST_REG_INVARIANTS)
__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)
__flag(BPF_F_TEST_REG_INVARIANTS)
__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);
}
SEC("tc")
__description("bounds check with JMP_NE for reg edge")
__success __retval(0)
__naked void reg_not_equal_const(void)
{
asm volatile (" \
r6 = r1; \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
call %[bpf_get_prandom_u32]; \
r4 = r0; \
r4 &= 7; \
if r4 != 0 goto l0_%=; \
r0 = 0; \
exit; \
l0_%=: r1 = r6; \
r2 = 0; \
r3 = r10; \
r3 += -8; \
r5 = 0; \
/* The 4th argument of bpf_skb_store_bytes is defined as \
* ARG_CONST_SIZE, so 0 is not allowed. The 'r4 != 0' \
* is providing us this exclusion of zero from initial \
* [0, 7] range. \
*/ \
call %[bpf_skb_store_bytes]; \
r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("bounds check with JMP_EQ for reg edge")
__success __retval(0)
__naked void reg_equal_const(void)
{
asm volatile (" \
r6 = r1; \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
call %[bpf_get_prandom_u32]; \
r4 = r0; \
r4 &= 7; \
if r4 == 0 goto l0_%=; \
r1 = r6; \
r2 = 0; \
r3 = r10; \
r3 += -8; \
r5 = 0; \
/* Just the same as what we do in reg_not_equal_const() */ \
call %[bpf_skb_store_bytes]; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiply mixed sign bounds. test 1")
__success __log_level(2)
__msg("r6 *= r7 {{.*}}; R6=scalar(smin=umin=0x1bc16d5cd4927ee1,smax=umax=0x1bc16d674ec80000,smax32=0x7ffffeff,umax32=0xfffffeff,var_off=(0x1bc16d4000000000; 0x3ffffffeff))")
__naked void mult_mixed0_sign(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r6 = r0;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= 0xf;"
"r6 -= 1000000000;"
"r7 &= 0xf;"
"r7 -= 2000000000;"
"r6 *= r7;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiply mixed sign bounds. test 2")
__success __log_level(2)
__msg("r6 *= r7 {{.*}}; R6=scalar(smin=smin32=-100,smax=smax32=200)")
__naked void mult_mixed1_sign(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r6 = r0;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= 0xf;"
"r6 -= 0xa;"
"r7 &= 0xf;"
"r7 -= 0x14;"
"r6 *= r7;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiply negative bounds")
__success __log_level(2)
__msg("r6 *= r7 {{.*}}; R6=scalar(smin=umin=smin32=umin32=0x3ff280b0,smax=umax=smax32=umax32=0x3fff0001,var_off=(0x3ff00000; 0xf81ff))")
__naked void mult_sign_bounds(void)
{
asm volatile (
"r8 = 0x7fff;"
"call %[bpf_get_prandom_u32];"
"r6 = r0;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= 0xa;"
"r6 -= r8;"
"r7 &= 0xf;"
"r7 -= r8;"
"r6 *= r7;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiply bounds that don't cross signed boundary")
__success __log_level(2)
__msg("r8 *= r6 {{.*}}; R6=scalar(smin=smin32=0,smax=umax=smax32=umax32=11,var_off=(0x0; 0xb)) R8=scalar(smin=0,smax=umax=0x7b96bb0a94a3a7cd,var_off=(0x0; 0x7fffffffffffffff))")
__naked void mult_no_sign_crossing(void)
{
asm volatile (
"r6 = 0xb;"
"r8 = 0xb3c3f8c99262687 ll;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= r7;"
"r8 *= r6;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiplication overflow, result in unbounded reg. test 1")
__success __log_level(2)
__msg("r6 *= r7 {{.*}}; R6=scalar()")
__naked void mult_unsign_ovf(void)
{
asm volatile (
"r8 = 0x7ffffffffff ll;"
"call %[bpf_get_prandom_u32];"
"r6 = r0;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= 0x7fffffff;"
"r7 &= r8;"
"r6 *= r7;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("tc")
__description("multiplication overflow, result in unbounded reg. test 2")
__success __log_level(2)
__msg("r6 *= r7 {{.*}}; R6=scalar()")
__naked void mult_sign_ovf(void)
{
asm volatile (
"r8 = 0x7ffffffff ll;"
"call %[bpf_get_prandom_u32];"
"r6 = r0;"
"call %[bpf_get_prandom_u32];"
"r7 = r0;"
"r6 &= 0xa;"
"r6 -= r8;"
"r7 &= 0x7fffffff;"
"r6 *= r7;"
"exit"
:
: __imm(bpf_get_prandom_u32),
__imm(bpf_skb_store_bytes)
: __clobber_all);
}
SEC("socket")
__description("64-bit addition, all outcomes overflow")
__success __log_level(2)
__msg("5: (0f) r3 += r3 {{.*}} R3=scalar(umin=0x4000000000000000,umax=0xfffffffffffffffe)")
__retval(0)
__naked void add64_full_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r4 = r0;"
"r3 = 0xa000000000000000 ll;"
"r3 |= r4;"
"r3 += r3;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("64-bit addition, partial overflow, result in unbounded reg")
__success __log_level(2)
__msg("4: (0f) r3 += r3 {{.*}} R3=scalar()")
__retval(0)
__naked void add64_partial_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r4 = r0;"
"r3 = 2;"
"r3 |= r4;"
"r3 += r3;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("32-bit addition overflow, all outcomes overflow")
__success __log_level(2)
__msg("4: (0c) w3 += w3 {{.*}} R3=scalar(smin=umin=umin32=0x40000000,smax=umax=umax32=0xfffffffe,var_off=(0x0; 0xffffffff))")
__retval(0)
__naked void add32_full_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"w4 = w0;"
"w3 = 0xa0000000;"
"w3 |= w4;"
"w3 += w3;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("32-bit addition, partial overflow, result in unbounded u32 bounds")
__success __log_level(2)
__msg("4: (0c) w3 += w3 {{.*}} R3=scalar(smin=0,smax=umax=0xffffffff,var_off=(0x0; 0xffffffff))")
__retval(0)
__naked void add32_partial_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"w4 = w0;"
"w3 = 2;"
"w3 |= w4;"
"w3 += w3;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("64-bit subtraction, all outcomes underflow")
__success __log_level(2)
__msg("6: (1f) r3 -= r1 {{.*}} R3=scalar(umin=1,umax=0x8000000000000000)")
__retval(0)
__naked void sub64_full_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r1 = r0;"
"r2 = 0x8000000000000000 ll;"
"r1 |= r2;"
"r3 = 0;"
"r3 -= r1;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("64-bit subtraction, partial overflow, result in unbounded reg")
__success __log_level(2)
__msg("3: (1f) r3 -= r2 {{.*}} R3=scalar(id=1-1)")
__retval(0)
__naked void sub64_partial_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"r3 = r0;"
"r2 = 1;"
"r3 -= r2;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("32-bit subtraction overflow, all outcomes underflow")
__success __log_level(2)
__msg("5: (1c) w3 -= w1 {{.*}} R3=scalar(smin=umin=umin32=1,smax=umax=umax32=0x80000000,var_off=(0x0; 0xffffffff))")
__retval(0)
__naked void sub32_full_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"w1 = w0;"
"w2 = 0x80000000;"
"w1 |= w2;"
"w3 = 0;"
"w3 -= w1;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("32-bit subtraction, partial overflow, result in unbounded u32 bounds")
__success __log_level(2)
__msg("3: (1c) w3 -= w2 {{.*}} R3=scalar(smin=0,smax=umax=0xffffffff,var_off=(0x0; 0xffffffff))")
__retval(0)
__naked void sub32_partial_overflow(void)
{
asm volatile (
"call %[bpf_get_prandom_u32];"
"w3 = w0;"
"w2 = 1;"
"w3 -= w2;"
"r0 = 0;"
"exit"
:
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("dead branch on jset, does not result in invariants violation error")
__success __log_level(2)
__retval(0) __flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_range_analysis(void)
{
asm volatile (" \
call %[bpf_get_netns_cookie]; \
if r0 == 0 goto l0_%=; \
if r0 & 0xffffffff goto +0; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_get_netns_cookie)
: __clobber_all);
}
SEC("socket")
__description("bounds deduction cross sign boundary, negative overlap")
__success __log_level(2) __flag(BPF_F_TEST_REG_INVARIANTS)
__msg("7: (1f) r0 -= r6 {{.*}} R0=scalar(smin=smin32=-655,smax=smax32=-146,umin=0xfffffffffffffd71,umax=0xffffffffffffff6e,umin32=0xfffffd71,umax32=0xffffff6e,var_off=(0xfffffffffffffc00; 0x3ff))")
__retval(0)
__naked void bounds_deduct_negative_overlap(void)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w3 = w0; \
w6 = (s8)w0; \
r0 = (s8)r0; \
if w6 >= 0xf0000000 goto l0_%=; \
r0 += r6; \
r6 += 400; \
r0 -= r6; \
if r3 < r0 goto l0_%=; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds deduction cross sign boundary, positive overlap")
__success __log_level(2) __flag(BPF_F_TEST_REG_INVARIANTS)
__msg("3: (2d) if r0 > r1 {{.*}} R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=127,var_off=(0x0; 0x7f))")
__retval(0)
__naked void bounds_deduct_positive_overlap(void)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
r0 = (s8)r0; \
r1 = 0xffffffffffffff00; \
if r0 > r1 goto l0_%=; \
if r0 < 128 goto l0_%=; \
r10 = 0; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds deduction cross sign boundary, two overlaps")
__failure __flag(BPF_F_TEST_REG_INVARIANTS)
__msg("3: (2d) if r0 > r1 {{.*}} R0=scalar(smin=smin32=-128,smax=smax32=127,umax=0xffffffffffffff80)")
__msg("frame pointer is read only")
__naked void bounds_deduct_two_overlaps(void)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
r0 = (s8)r0; \
r1 = 0xffffffffffffff80; \
if r0 > r1 goto l0_%=; \
if r0 < 128 goto l0_%=; \
r10 = 0; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("dead jne branch due to disagreeing tnums")
__success __log_level(2)
__naked void jne_disagreeing_tnums(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w0 = w0; \
r0 >>= 30; \
r0 <<= 30; \
r1 = r0; \
r1 += 1024; \
if r1 != r0 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("dead jeq branch due to disagreeing tnums")
__success __log_level(2)
__naked void jeq_disagreeing_tnums(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w0 = w0; \
r0 >>= 30; \
r0 <<= 30; \
r1 = r0; \
r1 += 1024; \
if r1 == r0 goto +1; \
exit; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("conditional jump on same register, branch taken")
__not_msg("20: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__retval(0) __flag(BPF_F_TEST_REG_INVARIANTS)
__naked void condition_jump_on_same_register(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w8 = 0x80000000; \
r0 &= r8; \
if r0 == r0 goto +1; \
goto l1_%=; \
if r0 >= r0 goto +1; \
goto l1_%=; \
if r0 s>= r0 goto +1; \
goto l1_%=; \
if r0 <= r0 goto +1; \
goto l1_%=; \
if r0 s<= r0 goto +1; \
goto l1_%=; \
if r0 != r0 goto l1_%=; \
if r0 > r0 goto l1_%=; \
if r0 s> r0 goto l1_%=; \
if r0 < r0 goto l1_%=; \
if r0 s< r0 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("jset on same register, constant value branch taken")
__not_msg("7: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__retval(0) __flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_on_same_register_1(void *ctx)
{
asm volatile(" \
r0 = 0; \
if r0 & r0 goto l1_%=; \
r0 = 1; \
if r0 & r0 goto +1; \
goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("jset on same register, scalar value branch taken")
__not_msg("12: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__retval(0) __flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_on_same_register_2(void *ctx)
{
asm volatile(" \
/* range [1;2] */ \
call %[bpf_get_prandom_u32]; \
r0 &= 0x1; \
r0 += 1; \
if r0 & r0 goto +1; \
goto l1_%=; \
/* range [-2;-1] */ \
call %[bpf_get_prandom_u32]; \
r0 &= 0x1; \
r0 -= 2; \
if r0 & r0 goto +1; \
goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("jset on same register, scalar value unknown branch 1")
__msg("3: (b7) r0 = 0 {{.*}} R0=0")
__msg("5: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_on_same_register_3(void *ctx)
{
asm volatile(" \
/* range [0;1] */ \
call %[bpf_get_prandom_u32]; \
r0 &= 0x1; \
if r0 & r0 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("jset on same register, scalar value unknown branch 2")
__msg("4: (b7) r0 = 0 {{.*}} R0=0")
__msg("6: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_on_same_register_4(void *ctx)
{
asm volatile(" \
/* range [-1;0] */ \
call %[bpf_get_prandom_u32]; \
r0 &= 0x1; \
r0 -= 1; \
if r0 & r0 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("jset on same register, scalar value unknown branch 3")
__msg("4: (b7) r0 = 0 {{.*}} R0=0")
__msg("6: (b7) r0 = 1 {{.*}} R0=1")
__success __log_level(2)
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void jset_on_same_register_5(void *ctx)
{
asm volatile(" \
/* range [-1;1] */ \
call %[bpf_get_prandom_u32]; \
r0 &= 0x2; \
r0 -= 1; \
if r0 & r0 goto l1_%=; \
l0_%=: r0 = 0; \
exit; \
l1_%=: r0 = 1; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds refinement with single-value tnum on umax")
__msg("3: (15) if r0 == 0xe0 {{.*}} R0=240")
__success __log_level(2)
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void bounds_refinement_tnum_umax(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
r0 |= 0xe0; \
r0 &= 0xf0; \
if r0 == 0xe0 goto +2; \
if r0 == 0xf0 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds refinement with single-value tnum on umin")
__msg("3: (15) if r0 == 0xf0 {{.*}} R0=224")
__success __log_level(2)
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void bounds_refinement_tnum_umin(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
r0 |= 0xe0; \
r0 &= 0xf0; \
if r0 == 0xf0 goto +2; \
if r0 == 0xe0 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds refinement with single-value tnum in middle of range")
__msg("3: (a5) if r0 < 0x7cf {{.*}} R0=2000")
__success __log_level(2)
__naked void bounds_refinement_tnum_middle(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
if r0 & 0x0f goto +4; \
if r0 > 0x7df goto +3; \
if r0 < 0x7cf goto +2; \
if r0 == 0x7d0 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds refinement: several overlaps between tnum and u64")
__msg("2: (25) if r0 > 0x1 {{.*}} R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=1,var_off=(0x0; 0x1))")
__failure __log_level(2)
__naked void bounds_refinement_several_overlaps(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
if r0 < 0 goto +3; \
if r0 > 1 goto +2; \
if r0 == 1 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds refinement: multiple overlaps between tnum and u64")
__msg("2: (25) if r0 > 0x10 {{.*}} R0=scalar(smin=umin=smin32=umin32=15,smax=umax=smax32=umax32=16,var_off=(0x0; 0x1f))")
__failure __log_level(2)
__naked void bounds_refinement_multiple_overlaps(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
if r0 < 0xf goto +3; \
if r0 > 0x10 goto +2; \
if r0 == 0x10 goto +1; \
r10 = 0; \
exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void signed_unsigned_intersection32_case1(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w0 &= 0xffffffff; \
if w0 < 0x3 goto 1f; /* on fall-through u32 range [3..U32_MAX] */ \
if w0 s> 0x1 goto 1f; /* on fall-through s32 range [S32_MIN..1] */ \
if w0 s< 0x0 goto 1f; /* range can be narrowed to [S32_MIN..-1] */ \
r10 = 0; /* thus predicting the jump. */ \
1: exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__success
__flag(BPF_F_TEST_REG_INVARIANTS)
__naked void signed_unsigned_intersection32_case2(void *ctx)
{
asm volatile(" \
call %[bpf_get_prandom_u32]; \
w0 &= 0xffffffff; \
if w0 > 0x80000003 goto 1f; /* on fall-through u32 range [0..S32_MIN+3] */ \
if w0 s< -3 goto 1f; /* on fall-through s32 range [-3..S32_MAX] */ \
if w0 s> 5 goto 1f; /* on fall-through s32 range [-3..5] */ \
if w0 <= 5 goto 1f; /* range can be narrowed to [0..5] */ \
r10 = 0; /* thus predicting the jump */ \
1: exit; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("maybe_fork_scalars: OR with constant rejects OOB")
__failure __msg("invalid access to map value")
__naked void or_scalar_fork_rejects_oob(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_%=; \
r9 = r0; \
r6 = *(u64*)(r9 + 0); \
r6 s>>= 63; \
r6 |= 8; \
/* r6 is -1 (current) or 8 (pushed) */ \
if r6 s< 0 goto l0_%=; \
/* pushed path: r6 = 8, OOB for value_size=8 */ \
r9 += r6; \
r0 = *(u8*)(r9 + 0); \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("maybe_fork_scalars: AND with constant still works")
__success __retval(0)
__naked void and_scalar_fork_still_works(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_%=; \
r9 = r0; \
r6 = *(u64*)(r9 + 0); \
r6 s>>= 63; \
r6 &= 4; \
/* \
* r6 is 0 (pushed, 0&4==0) or 4 (current) \
* both within value_size=8 \
*/ \
if r6 s< 0 goto l0_%=; \
r9 += r6; \
r0 = *(u8*)(r9 + 0); \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("socket")
__description("maybe_fork_scalars: OR with constant allows in-bounds")
__success __retval(0)
__naked void or_scalar_fork_allows_inbounds(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_%=; \
r9 = r0; \
r6 = *(u64*)(r9 + 0); \
r6 s>>= 63; \
r6 |= 4; \
/* \
* r6 is -1 (current) or 4 (pushed) \
* pushed path: r6 = 4, within value_size=8 \
*/ \
if r6 s< 0 goto l0_%=; \
r9 += r6; \
r0 = *(u8*)(r9 + 0); \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
