#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct other_val {
long long foo;
long long bar;
};
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, long long);
__type(value, struct other_val);
} map_hash_16b SEC(".maps");
#define MAX_ENTRIES 11
struct test_val {
unsigned int index;
int foo[MAX_ENTRIES];
};
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, long long);
__type(value, struct test_val);
} map_hash_48b SEC(".maps");
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("tracepoint")
__description("helper access to map: full range")
__success
__naked void access_to_map_full_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r2 = %[sizeof_test_val]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(sizeof_test_val, sizeof(struct test_val))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: partial range")
__success
__naked void access_to_map_partial_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r2 = 8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: empty range")
__failure __msg("R2 invalid zero-sized read: u64=[0,0]")
__naked void access_to_map_empty_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r2 = 0; \
call %[bpf_trace_printk]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_trace_printk),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: possibly-empty ange")
__failure __msg("R2 invalid zero-sized read: u64=[0,4]")
__naked void access_to_map_possibly_empty_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
/* Read an unknown value */ \
r7 = *(u64*)(r0 + 0); \
/* Make it small and positive, to avoid other errors */ \
r7 &= 4; \
r2 = 0; \
r2 += r7; \
call %[bpf_trace_printk]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_trace_printk),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: out-of-bound range")
__failure __msg("invalid access to map value, value_size=48 off=0 size=56")
__naked void map_out_of_bound_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) + 8)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: negative range")
__failure __msg("R2 min value is negative")
__naked void access_to_map_negative_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r2 = -8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): full range")
__success
__naked void via_const_imm_full_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo)),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): partial range")
__success
__naked void via_const_imm_partial_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = 8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): empty range")
__failure __msg("R2 invalid zero-sized read")
__naked void via_const_imm_empty_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = 0; \
call %[bpf_trace_printk]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_trace_printk),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): out-of-bound range")
__failure __msg("invalid access to map value, value_size=48 off=4 size=52")
__naked void imm_out_of_bound_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo) + 8),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): negative range (> adjustment)")
__failure __msg("R2 min value is negative")
__naked void const_imm_negative_range_adjustment_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = -8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const imm): negative range (< adjustment)")
__failure __msg("R2 min value is negative")
__naked void const_imm_negative_range_adjustment_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r1 += %[test_val_foo]; \
r2 = -1; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): full range")
__success
__naked void via_const_reg_full_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = %[test_val_foo]; \
r1 += r3; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo)),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): partial range")
__success
__naked void via_const_reg_partial_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = %[test_val_foo]; \
r1 += r3; \
r2 = 8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): empty range")
__failure __msg("R2 invalid zero-sized read")
__naked void via_const_reg_empty_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = 0; \
r1 += r3; \
r2 = 0; \
call %[bpf_trace_printk]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_trace_printk),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): out-of-bound range")
__failure __msg("invalid access to map value, value_size=48 off=4 size=52")
__naked void reg_out_of_bound_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = %[test_val_foo]; \
r1 += r3; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo) + 8),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): negative range (> adjustment)")
__failure __msg("R2 min value is negative")
__naked void const_reg_negative_range_adjustment_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = %[test_val_foo]; \
r1 += r3; \
r2 = -8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via const reg): negative range (< adjustment)")
__failure __msg("R2 min value is negative")
__naked void const_reg_negative_range_adjustment_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = %[test_val_foo]; \
r1 += r3; \
r2 = -1; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via variable): full range")
__success
__naked void map_via_variable_full_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[test_val_foo] goto l0_%=; \
r1 += r3; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo)),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via variable): partial range")
__success
__naked void map_via_variable_partial_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[test_val_foo] goto l0_%=; \
r1 += r3; \
r2 = 8; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via variable): empty range")
__failure __msg("R2 invalid zero-sized read")
__naked void map_via_variable_empty_range(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[test_val_foo] goto l0_%=; \
r1 += r3; \
r2 = 0; \
call %[bpf_trace_printk]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_trace_printk),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via variable): no max check")
__failure __msg("R1 unbounded memory access")
__naked void via_variable_no_max_check_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
r1 += r3; \
r2 = 1; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to adjusted map (via variable): wrong max check")
__failure __msg("invalid access to map value, value_size=48 off=4 size=45")
__naked void via_variable_wrong_max_check_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[test_val_foo] goto l0_%=; \
r1 += r3; \
r2 = %[__imm_0]; \
r3 = 0; \
call %[bpf_probe_read_kernel]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_probe_read_kernel),
__imm_addr(map_hash_48b),
__imm_const(__imm_0, sizeof(struct test_val) - offsetof(struct test_val, foo) + 1),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using <, good access")
__success
__naked void bounds_check_using_good_access_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 < 32 goto l1_%=; \
r0 = 0; \
l0_%=: exit; \
l1_%=: r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using <, bad access")
__failure __msg("R1 unbounded memory access")
__naked void bounds_check_using_bad_access_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 < 32 goto l1_%=; \
r1 += r3; \
l0_%=: r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using <=, good access")
__success
__naked void bounds_check_using_good_access_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 <= 32 goto l1_%=; \
r0 = 0; \
l0_%=: exit; \
l1_%=: r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using <=, bad access")
__failure __msg("R1 unbounded memory access")
__naked void bounds_check_using_bad_access_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 <= 32 goto l1_%=; \
r1 += r3; \
l0_%=: r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
l1_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<, good access")
__success
__naked void check_using_s_good_access_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 s< 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s< 0 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<, good access 2")
__success
__naked void using_s_good_access_2_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 s< 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s< -3 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<, bad access")
__failure __msg("R1 min value is negative")
__naked void check_using_s_bad_access_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u64*)(r0 + 0); \
if r3 s< 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s< -3 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<=, good access")
__success
__naked void check_using_s_good_access_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 s<= 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s<= 0 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<=, good access 2")
__success
__naked void using_s_good_access_2_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 s<= 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s<= -3 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("helper access to map: bounds check using s<=, bad access")
__failure __msg("R1 min value is negative")
__naked void check_using_s_bad_access_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_48b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r0; \
r3 = *(u64*)(r0 + 0); \
if r3 s<= 32 goto l1_%=; \
l2_%=: r0 = 0; \
l0_%=: exit; \
l1_%=: if r3 s<= -3 goto l2_%=; \
r1 += r3; \
r0 = 0; \
*(u8*)(r1 + 0) = r0; \
r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("tracepoint")
__description("map lookup helper access to map")
__success
__naked void lookup_helper_access_to_map(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b)
: __clobber_all);
}
SEC("tracepoint")
__description("map update helper access to map")
__success
__naked void update_helper_access_to_map(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r4 = 0; \
r3 = r0; \
r2 = r0; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_update_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_map_update_elem),
__imm_addr(map_hash_16b)
: __clobber_all);
}
SEC("tracepoint")
__description("map update helper access to map: wrong size")
__failure __msg("invalid access to map value, value_size=8 off=0 size=16")
__naked void access_to_map_wrong_size(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r4 = 0; \
r3 = r0; \
r2 = r0; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_update_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_map_update_elem),
__imm_addr(map_hash_16b),
__imm_addr(map_hash_8b)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const imm)")
__success
__naked void adjusted_map_via_const_imm(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r2 += %[other_val_bar]; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(other_val_bar, offsetof(struct other_val, bar))
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const imm): out-of-bound 1")
__failure __msg("invalid access to map value, value_size=16 off=12 size=8")
__naked void imm_out_of_bound_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r2 += %[__imm_0]; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(__imm_0, sizeof(struct other_val) - 4)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const imm): out-of-bound 2")
__failure __msg("invalid access to map value, value_size=16 off=-4 size=8")
__naked void imm_out_of_bound_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r2 += -4; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const reg)")
__success
__naked void adjusted_map_via_const_reg(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = %[other_val_bar]; \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(other_val_bar, offsetof(struct other_val, bar))
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const reg): out-of-bound 1")
__failure __msg("invalid access to map value, value_size=16 off=12 size=8")
__naked void reg_out_of_bound_1(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = %[__imm_0]; \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(__imm_0, sizeof(struct other_val) - 4)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via const reg): out-of-bound 2")
__failure __msg("invalid access to map value, value_size=16 off=-4 size=8")
__naked void reg_out_of_bound_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = -4; \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via variable)")
__success
__naked void to_adjusted_map_via_variable(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[other_val_bar] goto l0_%=; \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(other_val_bar, offsetof(struct other_val, bar))
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via variable): no max check")
__failure
__msg("R2 unbounded memory access, make sure to bounds check any such access")
__naked void via_variable_no_max_check_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = *(u32*)(r0 + 0); \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b)
: __clobber_all);
}
SEC("tracepoint")
__description("map helper access to adjusted map (via variable): wrong max check")
__failure __msg("invalid access to map value, value_size=16 off=9 size=8")
__naked void via_variable_wrong_max_check_2(void)
{
asm volatile (" \
r2 = r10; \
r2 += -8; \
r1 = 0; \
*(u64*)(r2 + 0) = r1; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r2 = r0; \
r3 = *(u32*)(r0 + 0); \
if r3 > %[__imm_0] goto l0_%=; \
r2 += r3; \
r1 = %[map_hash_16b] ll; \
call %[bpf_map_lookup_elem]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_16b),
__imm_const(__imm_0, offsetof(struct other_val, bar) + 1)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
