selftests/bpf: verifier/spill_fill.c converted to inline assembly
Test verifier/spill_fill.c automatically converted to use inline assembly. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230325025524.144043-35-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman
Alexei Starovoitov
Родитель
b7e4203086
Коммит
f4fe3cfe6c
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@ -31,6 +31,7 @@
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#include "verifier_raw_stack.skel.h"
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#include "verifier_raw_tp_writable.skel.h"
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#include "verifier_ringbuf.skel.h"
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#include "verifier_spill_fill.skel.h"
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__maybe_unused
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static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
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@ -84,3 +85,4 @@ void test_verifier_meta_access(void) { RUN(verifier_meta_access); }
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void test_verifier_raw_stack(void) { RUN(verifier_raw_stack); }
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void test_verifier_raw_tp_writable(void) { RUN(verifier_raw_tp_writable); }
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void test_verifier_ringbuf(void) { RUN(verifier_ringbuf); }
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void test_verifier_spill_fill(void) { RUN(verifier_spill_fill); }
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@ -0,0 +1,374 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/spill_fill.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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struct {
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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__uint(max_entries, 4096);
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} map_ringbuf SEC(".maps");
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SEC("socket")
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__description("check valid spill/fill")
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__success __failure_unpriv __msg_unpriv("R0 leaks addr")
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__retval(POINTER_VALUE)
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__naked void check_valid_spill_fill(void)
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{
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asm volatile (" \
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/* spill R1(ctx) into stack */ \
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*(u64*)(r10 - 8) = r1; \
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/* fill it back into R2 */ \
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r2 = *(u64*)(r10 - 8); \
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/* should be able to access R0 = *(R2 + 8) */ \
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/* BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, 8), */\
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r0 = r2; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check valid spill/fill, skb mark")
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__success __success_unpriv __retval(0)
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__naked void valid_spill_fill_skb_mark(void)
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{
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asm volatile (" \
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r6 = r1; \
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*(u64*)(r10 - 8) = r6; \
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r0 = *(u64*)(r10 - 8); \
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r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
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exit; \
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" :
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: __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
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: __clobber_all);
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}
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SEC("socket")
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__description("check valid spill/fill, ptr to mem")
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__success __success_unpriv __retval(0)
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__naked void spill_fill_ptr_to_mem(void)
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{
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asm volatile (" \
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/* reserve 8 byte ringbuf memory */ \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r1 = %[map_ringbuf] ll; \
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r2 = 8; \
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r3 = 0; \
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call %[bpf_ringbuf_reserve]; \
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/* store a pointer to the reserved memory in R6 */\
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r6 = r0; \
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/* check whether the reservation was successful */\
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if r0 == 0 goto l0_%=; \
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/* spill R6(mem) into the stack */ \
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*(u64*)(r10 - 8) = r6; \
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/* fill it back in R7 */ \
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r7 = *(u64*)(r10 - 8); \
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/* should be able to access *(R7) = 0 */ \
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r1 = 0; \
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*(u64*)(r7 + 0) = r1; \
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/* submit the reserved ringbuf memory */ \
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r1 = r7; \
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r2 = 0; \
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call %[bpf_ringbuf_submit]; \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm(bpf_ringbuf_reserve),
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__imm(bpf_ringbuf_submit),
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__imm_addr(map_ringbuf)
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: __clobber_all);
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}
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SEC("socket")
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__description("check with invalid reg offset 0")
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__failure __msg("R0 pointer arithmetic on ringbuf_mem_or_null prohibited")
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__failure_unpriv
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__naked void with_invalid_reg_offset_0(void)
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{
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asm volatile (" \
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/* reserve 8 byte ringbuf memory */ \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r1 = %[map_ringbuf] ll; \
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r2 = 8; \
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r3 = 0; \
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call %[bpf_ringbuf_reserve]; \
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/* store a pointer to the reserved memory in R6 */\
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r6 = r0; \
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/* add invalid offset to memory or NULL */ \
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r0 += 1; \
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/* check whether the reservation was successful */\
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if r0 == 0 goto l0_%=; \
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/* should not be able to access *(R7) = 0 */ \
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r1 = 0; \
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*(u32*)(r6 + 0) = r1; \
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/* submit the reserved ringbuf memory */ \
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r1 = r6; \
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r2 = 0; \
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call %[bpf_ringbuf_submit]; \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm(bpf_ringbuf_reserve),
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__imm(bpf_ringbuf_submit),
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__imm_addr(map_ringbuf)
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: __clobber_all);
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}
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SEC("socket")
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__description("check corrupted spill/fill")
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__failure __msg("R0 invalid mem access 'scalar'")
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__msg_unpriv("attempt to corrupt spilled")
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__flag(BPF_F_ANY_ALIGNMENT)
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__naked void check_corrupted_spill_fill(void)
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{
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asm volatile (" \
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/* spill R1(ctx) into stack */ \
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*(u64*)(r10 - 8) = r1; \
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/* mess up with R1 pointer on stack */ \
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r0 = 0x23; \
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*(u8*)(r10 - 7) = r0; \
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/* fill back into R0 is fine for priv. \
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* R0 now becomes SCALAR_VALUE. \
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*/ \
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r0 = *(u64*)(r10 - 8); \
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/* Load from R0 should fail. */ \
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r0 = *(u64*)(r0 + 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check corrupted spill/fill, LSB")
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__success __failure_unpriv __msg_unpriv("attempt to corrupt spilled")
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__retval(POINTER_VALUE)
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__naked void check_corrupted_spill_fill_lsb(void)
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{
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asm volatile (" \
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*(u64*)(r10 - 8) = r1; \
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r0 = 0xcafe; \
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*(u16*)(r10 - 8) = r0; \
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r0 = *(u64*)(r10 - 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("socket")
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__description("check corrupted spill/fill, MSB")
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__success __failure_unpriv __msg_unpriv("attempt to corrupt spilled")
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__retval(POINTER_VALUE)
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__naked void check_corrupted_spill_fill_msb(void)
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{
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asm volatile (" \
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*(u64*)(r10 - 8) = r1; \
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r0 = 0x12345678; \
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*(u32*)(r10 - 4) = r0; \
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r0 = *(u64*)(r10 - 8); \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tc")
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__description("Spill and refill a u32 const scalar. Offset to skb->data")
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__success __retval(0)
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__naked void scalar_offset_to_skb_data_1(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
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r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
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w4 = 20; \
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*(u32*)(r10 - 8) = r4; \
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r4 = *(u32*)(r10 - 8); \
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r0 = r2; \
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=20 */ \
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r0 += r4; \
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/* if (r0 > r3) R0=pkt,off=20 R2=pkt R3=pkt_end R4=20 */\
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if r0 > r3 goto l0_%=; \
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/* r0 = *(u32 *)r2 R0=pkt,off=20,r=20 R2=pkt,r=20 R3=pkt_end R4=20 */\
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r0 = *(u32*)(r2 + 0); \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
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__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
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: __clobber_all);
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}
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SEC("socket")
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__description("Spill a u32 const, refill from another half of the uninit u32 from the stack")
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/* in privileged mode reads from uninitialized stack locations are permitted */
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__success __failure_unpriv
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__msg_unpriv("invalid read from stack off -4+0 size 4")
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__retval(0)
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__naked void uninit_u32_from_the_stack(void)
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{
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asm volatile (" \
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w4 = 20; \
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*(u32*)(r10 - 8) = r4; \
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/* r4 = *(u32 *)(r10 -4) fp-8=????rrrr*/ \
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r4 = *(u32*)(r10 - 4); \
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tc")
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__description("Spill a u32 const scalar. Refill as u16. Offset to skb->data")
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__failure __msg("invalid access to packet")
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__naked void u16_offset_to_skb_data(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
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r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
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w4 = 20; \
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*(u32*)(r10 - 8) = r4; \
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r4 = *(u16*)(r10 - 8); \
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r0 = r2; \
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
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r0 += r4; \
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
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if r0 > r3 goto l0_%=; \
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
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r0 = *(u32*)(r2 + 0); \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
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__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
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: __clobber_all);
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}
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SEC("tc")
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__description("Spill u32 const scalars. Refill as u64. Offset to skb->data")
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__failure __msg("invalid access to packet")
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__naked void u64_offset_to_skb_data(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
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r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
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w6 = 0; \
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w7 = 20; \
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*(u32*)(r10 - 4) = r6; \
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*(u32*)(r10 - 8) = r7; \
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r4 = *(u16*)(r10 - 8); \
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r0 = r2; \
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
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r0 += r4; \
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
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if r0 > r3 goto l0_%=; \
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
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r0 = *(u32*)(r2 + 0); \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
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__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
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: __clobber_all);
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}
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SEC("tc")
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__description("Spill a u32 const scalar. Refill as u16 from fp-6. Offset to skb->data")
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__failure __msg("invalid access to packet")
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__naked void _6_offset_to_skb_data(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
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r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
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w4 = 20; \
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*(u32*)(r10 - 8) = r4; \
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r4 = *(u16*)(r10 - 6); \
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r0 = r2; \
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
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r0 += r4; \
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/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
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if r0 > r3 goto l0_%=; \
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/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
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r0 = *(u32*)(r2 + 0); \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
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__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
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: __clobber_all);
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}
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SEC("tc")
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__description("Spill and refill a u32 const scalar at non 8byte aligned stack addr. Offset to skb->data")
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__failure __msg("invalid access to packet")
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__naked void addr_offset_to_skb_data(void)
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{
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asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
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r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
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w4 = 20; \
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*(u32*)(r10 - 8) = r4; \
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*(u32*)(r10 - 4) = r4; \
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r4 = *(u32*)(r10 - 4); \
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r0 = r2; \
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/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=U32_MAX */\
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r0 += r4; \
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/* if (r0 > r3) R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */\
|
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if r0 > r3 goto l0_%=; \
|
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/* r0 = *(u32 *)r2 R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */\
|
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r0 = *(u32*)(r2 + 0); \
|
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l0_%=: r0 = 0; \
|
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exit; \
|
||||
" :
|
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: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
|
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__imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end))
|
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: __clobber_all);
|
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}
|
||||
|
||||
SEC("tc")
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__description("Spill and refill a umax=40 bounded scalar. Offset to skb->data")
|
||||
__success __retval(0)
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__naked void scalar_offset_to_skb_data_2(void)
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{
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||||
asm volatile (" \
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r2 = *(u32*)(r1 + %[__sk_buff_data]); \
|
||||
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
|
||||
r4 = *(u64*)(r1 + %[__sk_buff_tstamp]); \
|
||||
if r4 <= 40 goto l0_%=; \
|
||||
r0 = 0; \
|
||||
exit; \
|
||||
l0_%=: /* *(u32 *)(r10 -8) = r4 R4=umax=40 */ \
|
||||
*(u32*)(r10 - 8) = r4; \
|
||||
/* r4 = (*u32 *)(r10 - 8) */ \
|
||||
r4 = *(u32*)(r10 - 8); \
|
||||
/* r2 += r4 R2=pkt R4=umax=40 */ \
|
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r2 += r4; \
|
||||
/* r0 = r2 R2=pkt,umax=40 R4=umax=40 */ \
|
||||
r0 = r2; \
|
||||
/* r2 += 20 R0=pkt,umax=40 R2=pkt,umax=40 */ \
|
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r2 += 20; \
|
||||
/* if (r2 > r3) R0=pkt,umax=40 R2=pkt,off=20,umax=40 */\
|
||||
if r2 > r3 goto l1_%=; \
|
||||
/* r0 = *(u32 *)r0 R0=pkt,r=20,umax=40 R2=pkt,off=20,r=20,umax=40 */\
|
||||
r0 = *(u32*)(r0 + 0); \
|
||||
l1_%=: 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)),
|
||||
__imm_const(__sk_buff_tstamp, offsetof(struct __sk_buff, tstamp))
|
||||
: __clobber_all);
|
||||
}
|
||||
|
||||
SEC("tc")
|
||||
__description("Spill a u32 scalar at fp-4 and then at fp-8")
|
||||
__success __retval(0)
|
||||
__naked void and_then_at_fp_8(void)
|
||||
{
|
||||
asm volatile (" \
|
||||
w4 = 4321; \
|
||||
*(u32*)(r10 - 4) = r4; \
|
||||
*(u32*)(r10 - 8) = r4; \
|
||||
r4 = *(u64*)(r10 - 8); \
|
||||
r0 = 0; \
|
||||
exit; \
|
||||
" ::: __clobber_all);
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
|
@ -1,345 +0,0 @@
|
|||
{
|
||||
"check valid spill/fill",
|
||||
.insns = {
|
||||
/* spill R1(ctx) into stack */
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
|
||||
/* fill it back into R2 */
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_10, -8),
|
||||
/* should be able to access R0 = *(R2 + 8) */
|
||||
/* BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, 8), */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.errstr_unpriv = "R0 leaks addr",
|
||||
.result = ACCEPT,
|
||||
.result_unpriv = REJECT,
|
||||
.retval = POINTER_VALUE,
|
||||
},
|
||||
{
|
||||
"check valid spill/fill, skb mark",
|
||||
.insns = {
|
||||
BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0,
|
||||
offsetof(struct __sk_buff, mark)),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.result_unpriv = ACCEPT,
|
||||
},
|
||||
{
|
||||
"check valid spill/fill, ptr to mem",
|
||||
.insns = {
|
||||
/* reserve 8 byte ringbuf memory */
|
||||
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
|
||||
BPF_LD_MAP_FD(BPF_REG_1, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 8),
|
||||
BPF_MOV64_IMM(BPF_REG_3, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
|
||||
/* store a pointer to the reserved memory in R6 */
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
/* check whether the reservation was successful */
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
|
||||
/* spill R6(mem) into the stack */
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
|
||||
/* fill it back in R7 */
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8),
|
||||
/* should be able to access *(R7) = 0 */
|
||||
BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0),
|
||||
/* submit the reserved ringbuf memory */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_map_ringbuf = { 1 },
|
||||
.result = ACCEPT,
|
||||
.result_unpriv = ACCEPT,
|
||||
},
|
||||
{
|
||||
"check with invalid reg offset 0",
|
||||
.insns = {
|
||||
/* reserve 8 byte ringbuf memory */
|
||||
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
|
||||
BPF_LD_MAP_FD(BPF_REG_1, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 8),
|
||||
BPF_MOV64_IMM(BPF_REG_3, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
|
||||
/* store a pointer to the reserved memory in R6 */
|
||||
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
|
||||
/* add invalid offset to memory or NULL */
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
|
||||
/* check whether the reservation was successful */
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
|
||||
/* should not be able to access *(R7) = 0 */
|
||||
BPF_ST_MEM(BPF_W, BPF_REG_6, 0, 0),
|
||||
/* submit the reserved ringbuf memory */
|
||||
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.fixup_map_ringbuf = { 1 },
|
||||
.result = REJECT,
|
||||
.errstr = "R0 pointer arithmetic on ringbuf_mem_or_null prohibited",
|
||||
},
|
||||
{
|
||||
"check corrupted spill/fill",
|
||||
.insns = {
|
||||
/* spill R1(ctx) into stack */
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
|
||||
/* mess up with R1 pointer on stack */
|
||||
BPF_ST_MEM(BPF_B, BPF_REG_10, -7, 0x23),
|
||||
/* fill back into R0 is fine for priv.
|
||||
* R0 now becomes SCALAR_VALUE.
|
||||
*/
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
|
||||
/* Load from R0 should fail. */
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.errstr_unpriv = "attempt to corrupt spilled",
|
||||
.errstr = "R0 invalid mem access 'scalar'",
|
||||
.result = REJECT,
|
||||
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
|
||||
},
|
||||
{
|
||||
"check corrupted spill/fill, LSB",
|
||||
.insns = {
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
|
||||
BPF_ST_MEM(BPF_H, BPF_REG_10, -8, 0xcafe),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.errstr_unpriv = "attempt to corrupt spilled",
|
||||
.result_unpriv = REJECT,
|
||||
.result = ACCEPT,
|
||||
.retval = POINTER_VALUE,
|
||||
},
|
||||
{
|
||||
"check corrupted spill/fill, MSB",
|
||||
.insns = {
|
||||
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1, -8),
|
||||
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0x12345678),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.errstr_unpriv = "attempt to corrupt spilled",
|
||||
.result_unpriv = REJECT,
|
||||
.result = ACCEPT,
|
||||
.retval = POINTER_VALUE,
|
||||
},
|
||||
{
|
||||
"Spill and refill a u32 const scalar. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
/* r4 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 20),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = *(u32 *)(r10 -8) */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -8),
|
||||
/* r0 = r2 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=20 */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||||
/* if (r0 > r3) R0=pkt,off=20 R2=pkt R3=pkt_end R4=20 */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r2 R0=pkt,off=20,r=20 R2=pkt,r=20 R3=pkt_end R4=20 */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill a u32 const, refill from another half of the uninit u32 from the stack",
|
||||
.insns = {
|
||||
/* r4 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 20),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = *(u32 *)(r10 -4) fp-8=????rrrr*/
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result_unpriv = REJECT,
|
||||
.errstr_unpriv = "invalid read from stack off -4+0 size 4",
|
||||
/* in privileged mode reads from uninitialized stack locations are permitted */
|
||||
.result = ACCEPT,
|
||||
},
|
||||
{
|
||||
"Spill a u32 const scalar. Refill as u16. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
/* r4 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 20),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = *(u16 *)(r10 -8) */
|
||||
BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
|
||||
/* r0 = r2 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||||
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = REJECT,
|
||||
.errstr = "invalid access to packet",
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill u32 const scalars. Refill as u64. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
/* r6 = 0 */
|
||||
BPF_MOV32_IMM(BPF_REG_6, 0),
|
||||
/* r7 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_7, 20),
|
||||
/* *(u32 *)(r10 -4) = r6 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_6, -4),
|
||||
/* *(u32 *)(r10 -8) = r7 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_7, -8),
|
||||
/* r4 = *(u64 *)(r10 -8) */
|
||||
BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -8),
|
||||
/* r0 = r2 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||||
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = REJECT,
|
||||
.errstr = "invalid access to packet",
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill a u32 const scalar. Refill as u16 from fp-6. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
/* r4 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 20),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = *(u16 *)(r10 -6) */
|
||||
BPF_LDX_MEM(BPF_H, BPF_REG_4, BPF_REG_10, -6),
|
||||
/* r0 = r2 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||||
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = REJECT,
|
||||
.errstr = "invalid access to packet",
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill and refill a u32 const scalar at non 8byte aligned stack addr. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
/* r4 = 20 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 20),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* *(u32 *)(r10 -4) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -4),
|
||||
/* r4 = *(u32 *)(r10 -4), */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -4),
|
||||
/* r0 = r2 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=U32_MAX */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_4),
|
||||
/* if (r0 > r3) R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r2 R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_2, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = REJECT,
|
||||
.errstr = "invalid access to packet",
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill and refill a umax=40 bounded scalar. Offset to skb->data",
|
||||
.insns = {
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data)),
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, data_end)),
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_1,
|
||||
offsetof(struct __sk_buff, tstamp)),
|
||||
BPF_JMP_IMM(BPF_JLE, BPF_REG_4, 40, 2),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
/* *(u32 *)(r10 -8) = r4 R4=umax=40 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = (*u32 *)(r10 - 8) */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_10, -8),
|
||||
/* r2 += r4 R2=pkt R4=umax=40 */
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_4),
|
||||
/* r0 = r2 R2=pkt,umax=40 R4=umax=40 */
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
/* r2 += 20 R0=pkt,umax=40 R2=pkt,umax=40 */
|
||||
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 20),
|
||||
/* if (r2 > r3) R0=pkt,umax=40 R2=pkt,off=20,umax=40 */
|
||||
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_3, 1),
|
||||
/* r0 = *(u32 *)r0 R0=pkt,r=20,umax=40 R2=pkt,off=20,r=20,umax=40 */
|
||||
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
{
|
||||
"Spill a u32 scalar at fp-4 and then at fp-8",
|
||||
.insns = {
|
||||
/* r4 = 4321 */
|
||||
BPF_MOV32_IMM(BPF_REG_4, 4321),
|
||||
/* *(u32 *)(r10 -4) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -4),
|
||||
/* *(u32 *)(r10 -8) = r4 */
|
||||
BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_4, -8),
|
||||
/* r4 = *(u64 *)(r10 -8) */
|
||||
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),
|
||||
BPF_MOV64_IMM(BPF_REG_0, 0),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
||||
},
|
||||
Загрузка…
Ссылка в новой задаче