diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/verifier_map_ptr_mixing.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_map_ptr_mixing.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_map_ptr_mixing.c b/tools/testing/selftests/bpf/progs/verifier_map_ptr_mixing.c new file mode 100644 index 000000000000..c5a7c1ddc562 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/verifier_map_ptr_mixing.c @@ -0,0 +1,265 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Converted from tools/testing/selftests/bpf/verifier/map_ptr_mixing.c */ + +#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_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, struct test_val); +} map_array_48b SEC(".maps"); + +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_ARRAY_OF_MAPS); + __uint(max_entries, 1); + __type(key, int); + __type(value, int); + __array(values, struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, int); + }); +} map_in_map SEC(".maps"); + +void dummy_prog_42_socket(void); +void dummy_prog_24_socket(void); +void dummy_prog_loop1_socket(void); +void dummy_prog_loop2_socket(void); + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, 4); + __uint(key_size, sizeof(int)); + __array(values, void (void)); +} map_prog1_socket SEC(".maps") = { + .values = { + [0] = (void *)&dummy_prog_42_socket, + [1] = (void *)&dummy_prog_loop1_socket, + [2] = (void *)&dummy_prog_24_socket, + }, +}; + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, 8); + __uint(key_size, sizeof(int)); + __array(values, void (void)); +} map_prog2_socket SEC(".maps") = { + .values = { + [1] = (void *)&dummy_prog_loop2_socket, + [2] = (void *)&dummy_prog_24_socket, + [7] = (void *)&dummy_prog_42_socket, + }, +}; + +SEC("socket") +__auxiliary __auxiliary_unpriv +__naked void dummy_prog_42_socket(void) +{ + asm volatile ("r0 = 42; exit;"); +} + +SEC("socket") +__auxiliary __auxiliary_unpriv +__naked void dummy_prog_24_socket(void) +{ + asm volatile ("r0 = 24; exit;"); +} + +SEC("socket") +__auxiliary __auxiliary_unpriv +__naked void dummy_prog_loop1_socket(void) +{ + asm volatile (" \ + r3 = 1; \ + r2 = %[map_prog1_socket] ll; \ + call %[bpf_tail_call]; \ + r0 = 41; \ + exit; \ +" : + : __imm(bpf_tail_call), + __imm_addr(map_prog1_socket) + : __clobber_all); +} + +SEC("socket") +__auxiliary __auxiliary_unpriv +__naked void dummy_prog_loop2_socket(void) +{ + asm volatile (" \ + r3 = 1; \ + r2 = %[map_prog2_socket] ll; \ + call %[bpf_tail_call]; \ + r0 = 41; \ + exit; \ +" : + : __imm(bpf_tail_call), + __imm_addr(map_prog2_socket) + : __clobber_all); +} + +SEC("tc") +__description("calls: two calls returning different map pointers for lookup (hash, array)") +__success __retval(1) +__naked void pointers_for_lookup_hash_array(void) +{ + asm volatile (" \ + /* main prog */ \ + if r1 != 0 goto l0_%=; \ + call pointers_for_lookup_hash_array__1; \ + goto l1_%=; \ +l0_%=: call pointers_for_lookup_hash_array__2; \ +l1_%=: r1 = r0; \ + r2 = 0; \ + *(u64*)(r10 - 8) = r2; \ + r2 = r10; \ + r2 += -8; \ + call %[bpf_map_lookup_elem]; \ + if r0 == 0 goto l2_%=; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = 1; \ +l2_%=: exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +static __naked __noinline __attribute__((used)) +void pointers_for_lookup_hash_array__1(void) +{ + asm volatile (" \ + r0 = %[map_hash_48b] ll; \ + exit; \ +" : + : __imm_addr(map_hash_48b) + : __clobber_all); +} + +static __naked __noinline __attribute__((used)) +void pointers_for_lookup_hash_array__2(void) +{ + asm volatile (" \ + r0 = %[map_array_48b] ll; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +SEC("tc") +__description("calls: two calls returning different map pointers for lookup (hash, map in map)") +__failure __msg("only read from bpf_array is supported") +__naked void lookup_hash_map_in_map(void) +{ + asm volatile (" \ + /* main prog */ \ + if r1 != 0 goto l0_%=; \ + call lookup_hash_map_in_map__1; \ + goto l1_%=; \ +l0_%=: call lookup_hash_map_in_map__2; \ +l1_%=: r1 = r0; \ + r2 = 0; \ + *(u64*)(r10 - 8) = r2; \ + r2 = r10; \ + r2 += -8; \ + call %[bpf_map_lookup_elem]; \ + if r0 == 0 goto l2_%=; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = 1; \ +l2_%=: exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +static __naked __noinline __attribute__((used)) +void lookup_hash_map_in_map__1(void) +{ + asm volatile (" \ + r0 = %[map_array_48b] ll; \ + exit; \ +" : + : __imm_addr(map_array_48b) + : __clobber_all); +} + +static __naked __noinline __attribute__((used)) +void lookup_hash_map_in_map__2(void) +{ + asm volatile (" \ + r0 = %[map_in_map] ll; \ + exit; \ +" : + : __imm_addr(map_in_map) + : __clobber_all); +} + +SEC("socket") +__description("cond: two branches returning different map pointers for lookup (tail, tail)") +__success __failure_unpriv __msg_unpriv("tail_call abusing map_ptr") +__retval(42) +__naked void pointers_for_lookup_tail_tail_1(void) +{ + asm volatile (" \ + r6 = *(u32*)(r1 + %[__sk_buff_mark]); \ + if r6 != 0 goto l0_%=; \ + r2 = %[map_prog2_socket] ll; \ + goto l1_%=; \ +l0_%=: r2 = %[map_prog1_socket] ll; \ +l1_%=: r3 = 7; \ + call %[bpf_tail_call]; \ + r0 = 1; \ + exit; \ +" : + : __imm(bpf_tail_call), + __imm_addr(map_prog1_socket), + __imm_addr(map_prog2_socket), + __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)) + : __clobber_all); +} + +SEC("socket") +__description("cond: two branches returning same map pointers for lookup (tail, tail)") +__success __success_unpriv __retval(42) +__naked void pointers_for_lookup_tail_tail_2(void) +{ + asm volatile (" \ + r6 = *(u32*)(r1 + %[__sk_buff_mark]); \ + if r6 == 0 goto l0_%=; \ + r2 = %[map_prog2_socket] ll; \ + goto l1_%=; \ +l0_%=: r2 = %[map_prog2_socket] ll; \ +l1_%=: r3 = 7; \ + call %[bpf_tail_call]; \ + r0 = 1; \ + exit; \ +" : + : __imm(bpf_tail_call), + __imm_addr(map_prog2_socket), + __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)) + : __clobber_all); +} + +char _license[] SEC("license") = "GPL"; |