#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#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");
SEC("socket")
__description("map element value store of cleared call register")
__failure __msg("R1 !read_ok")
__failure_unpriv __msg_unpriv("R1 !read_ok")
__naked void store_of_cleared_call_register(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_%=; \
*(u64*)(r0 + 0) = r1; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("socket")
__description("map element value with unaligned store")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void element_value_with_unaligned_store(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_%=; \
r0 += 3; \
r1 = 42; \
*(u64*)(r0 + 0) = r1; \
r1 = 43; \
*(u64*)(r0 + 2) = r1; \
r1 = 44; \
*(u64*)(r0 - 2) = r1; \
r8 = r0; \
r1 = 32; \
*(u64*)(r8 + 0) = r1; \
r1 = 33; \
*(u64*)(r8 + 2) = r1; \
r1 = 34; \
*(u64*)(r8 - 2) = r1; \
r8 += 5; \
r1 = 22; \
*(u64*)(r8 + 0) = r1; \
r1 = 23; \
*(u64*)(r8 + 4) = r1; \
r1 = 24; \
*(u64*)(r8 - 7) = r1; \
r7 = r8; \
r7 += 3; \
r1 = 22; \
*(u64*)(r7 + 0) = r1; \
r1 = 23; \
*(u64*)(r7 + 4) = r1; \
r1 = 24; \
*(u64*)(r7 - 4) = r1; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b)
: __clobber_all);
}
SEC("socket")
__description("map element value with unaligned load")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void element_value_with_unaligned_load(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 = *(u32*)(r0 + 0); \
if r1 >= %[max_entries] goto l0_%=; \
r0 += 3; \
r7 = *(u64*)(r0 + 0); \
r7 = *(u64*)(r0 + 2); \
r8 = r0; \
r7 = *(u64*)(r8 + 0); \
r7 = *(u64*)(r8 + 2); \
r0 += 5; \
r7 = *(u64*)(r0 + 0); \
r7 = *(u64*)(r0 + 4); \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b),
__imm_const(max_entries, MAX_ENTRIES)
: __clobber_all);
}
SEC("socket")
__description("map element value is preserved across register spilling")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(0) __flag(BPF_F_ANY_ALIGNMENT)
__naked void is_preserved_across_register_spilling(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_%=; \
r0 += %[test_val_foo]; \
r1 = 42; \
*(u64*)(r0 + 0) = r1; \
r1 = r10; \
r1 += -184; \
*(u64*)(r1 + 0) = r0; \
r3 = *(u64*)(r1 + 0); \
r1 = 42; \
*(u64*)(r3 + 0) = r1; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_48b),
__imm_const(test_val_foo, offsetof(struct test_val, foo))
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
