diff options
| -rw-r--r-- | kernel/bpf/verifier.c | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_movsx.c | 63 |
2 files changed, 65 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 010cfee7ffe9..e0a398a97d32 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6236,6 +6236,7 @@ static void set_sext32_default_val(struct bpf_reg_state *reg, int size) } reg->u32_min_value = 0; reg->u32_max_value = U32_MAX; + reg->var_off = tnum_subreg(tnum_unknown); } static void coerce_subreg_to_size_sx(struct bpf_reg_state *reg, int size) @@ -6280,6 +6281,7 @@ static void coerce_subreg_to_size_sx(struct bpf_reg_state *reg, int size) reg->s32_max_value = s32_max; reg->u32_min_value = (u32)s32_min; reg->u32_max_value = (u32)s32_max; + reg->var_off = tnum_subreg(tnum_range(s32_min, s32_max)); return; } diff --git a/tools/testing/selftests/bpf/progs/verifier_movsx.c b/tools/testing/selftests/bpf/progs/verifier_movsx.c index cbb9d6714f53..028ec855587b 100644 --- a/tools/testing/selftests/bpf/progs/verifier_movsx.c +++ b/tools/testing/selftests/bpf/progs/verifier_movsx.c @@ -224,6 +224,69 @@ l0_%=: \ : __clobber_all); } +SEC("socket") +__description("MOV32SX, S8, var_off u32_max") +__failure __msg("infinite loop detected") +__failure_unpriv __msg_unpriv("back-edge from insn 2 to 0") +__naked void mov64sx_s32_varoff_1(void) +{ + asm volatile (" \ +l0_%=: \ + r3 = *(u8 *)(r10 -387); \ + w7 = (s8)w3; \ + if w7 >= 0x2533823b goto l0_%=; \ + w0 = 0; \ + exit; \ +" : + : + : __clobber_all); +} + +SEC("socket") +__description("MOV32SX, S8, var_off not u32_max, positive after s8 extension") +__success __retval(0) +__failure_unpriv __msg_unpriv("frame pointer is read only") +__naked void mov64sx_s32_varoff_2(void) +{ + asm volatile (" \ + call %[bpf_get_prandom_u32]; \ + r3 = r0; \ + r3 &= 0xf; \ + w7 = (s8)w3; \ + if w7 s>= 16 goto l0_%=; \ + w0 = 0; \ + exit; \ +l0_%=: \ + r10 = 1; \ + exit; \ +" : + : __imm(bpf_get_prandom_u32) + : __clobber_all); +} + +SEC("socket") +__description("MOV32SX, S8, var_off not u32_max, negative after s8 extension") +__success __retval(0) +__failure_unpriv __msg_unpriv("frame pointer is read only") +__naked void mov64sx_s32_varoff_3(void) +{ + asm volatile (" \ + call %[bpf_get_prandom_u32]; \ + r3 = r0; \ + r3 &= 0xf; \ + r3 |= 0x80; \ + w7 = (s8)w3; \ + if w7 s>= -5 goto l0_%=; \ + w0 = 0; \ + exit; \ +l0_%=: \ + r10 = 1; \ + exit; \ +" : + : __imm(bpf_get_prandom_u32) + : __clobber_all); +} + #else SEC("socket") |