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Commit f4fe3cfe authored by Eduard Zingerman's avatar Eduard Zingerman Committed by Alexei Starovoitov
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selftests/bpf: verifier/spill_fill.c converted to inline assembly 

Test verifier/spill_fill.c automatically converted to use inline assembly.
Signed-off-by: default avatarEduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-35-eddyz87@gmail.comSigned-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent b7e42030
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Showing with 376 additions and 345 deletions
tools/testing/selftests/bpf/prog_tests/verifier.c
View file @ f4fe3cfe
......@@ -31,6 +31,7 @@
#include "verifier_raw_stack.skel.h"
#include "verifier_raw_tp_writable.skel.h"
#include "verifier_ringbuf.skel.h"
#include "verifier_spill_fill.skel.h"
__maybe_unused
static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
......@@ -84,3 +85,4 @@ void test_verifier_meta_access(void) { RUN(verifier_meta_access); }
void test_verifier_raw_stack(void) { RUN(verifier_raw_stack); }
void test_verifier_raw_tp_writable(void) { RUN(verifier_raw_tp_writable); }
void test_verifier_ringbuf(void) { RUN(verifier_ringbuf); }
void test_verifier_spill_fill(void) { RUN(verifier_spill_fill); }
tools/testing/selftests/bpf/progs/verifier_spill_fill.c 0 → 100644
View file @ f4fe3cfe
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/spill_fill.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
__uint(max_entries, 4096);
} map_ringbuf SEC(".maps");
SEC("socket")
__description("check valid spill/fill")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")
__retval(POINTER_VALUE)
__naked void check_valid_spill_fill(void)
{
asm volatile (" \
/* spill R1(ctx) into stack */ \
*(u64*)(r10 - 8) = r1; \
/* fill it back into R2 */ \
r2 = *(u64*)(r10 - 8); \
/* should be able to access R0 = *(R2 + 8) */ \
/* BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_2, 8), */\
r0 = r2; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("check valid spill/fill, skb mark")
__success __success_unpriv __retval(0)
__naked void valid_spill_fill_skb_mark(void)
{
asm volatile (" \
r6 = r1; \
*(u64*)(r10 - 8) = r6; \
r0 = *(u64*)(r10 - 8); \
r0 = *(u32*)(r0 + %[__sk_buff_mark]); \
exit; \
" :
: __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark))
: __clobber_all);
}
SEC("socket")
__description("check valid spill/fill, ptr to mem")
__success __success_unpriv __retval(0)
__naked void spill_fill_ptr_to_mem(void)
{
asm volatile (" \
/* reserve 8 byte ringbuf memory */ \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r1 = %[map_ringbuf] ll; \
r2 = 8; \
r3 = 0; \
call %[bpf_ringbuf_reserve]; \
/* store a pointer to the reserved memory in R6 */\
r6 = r0; \
/* check whether the reservation was successful */\
if r0 == 0 goto l0_%=; \
/* spill R6(mem) into the stack */ \
*(u64*)(r10 - 8) = r6; \
/* fill it back in R7 */ \
r7 = *(u64*)(r10 - 8); \
/* should be able to access *(R7) = 0 */ \
r1 = 0; \
*(u64*)(r7 + 0) = r1; \
/* submit the reserved ringbuf memory */ \
r1 = r7; \
r2 = 0; \
call %[bpf_ringbuf_submit]; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_ringbuf_reserve),
__imm(bpf_ringbuf_submit),
__imm_addr(map_ringbuf)
: __clobber_all);
}
SEC("socket")
__description("check with invalid reg offset 0")
__failure __msg("R0 pointer arithmetic on ringbuf_mem_or_null prohibited")
__failure_unpriv
__naked void with_invalid_reg_offset_0(void)
{
asm volatile (" \
/* reserve 8 byte ringbuf memory */ \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r1 = %[map_ringbuf] ll; \
r2 = 8; \
r3 = 0; \
call %[bpf_ringbuf_reserve]; \
/* store a pointer to the reserved memory in R6 */\
r6 = r0; \
/* add invalid offset to memory or NULL */ \
r0 += 1; \
/* check whether the reservation was successful */\
if r0 == 0 goto l0_%=; \
/* should not be able to access *(R7) = 0 */ \
r1 = 0; \
*(u32*)(r6 + 0) = r1; \
/* submit the reserved ringbuf memory */ \
r1 = r6; \
r2 = 0; \
call %[bpf_ringbuf_submit]; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_ringbuf_reserve),
__imm(bpf_ringbuf_submit),
__imm_addr(map_ringbuf)
: __clobber_all);
}
SEC("socket")
__description("check corrupted spill/fill")
__failure __msg("R0 invalid mem access 'scalar'")
__msg_unpriv("attempt to corrupt spilled")
__flag(BPF_F_ANY_ALIGNMENT)
__naked void check_corrupted_spill_fill(void)
{
asm volatile (" \
/* spill R1(ctx) into stack */ \
*(u64*)(r10 - 8) = r1; \
/* mess up with R1 pointer on stack */ \
r0 = 0x23; \
*(u8*)(r10 - 7) = r0; \
/* fill back into R0 is fine for priv. \
* R0 now becomes SCALAR_VALUE. \
*/ \
r0 = *(u64*)(r10 - 8); \
/* Load from R0 should fail. */ \
r0 = *(u64*)(r0 + 8); \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("check corrupted spill/fill, LSB")
__success __failure_unpriv __msg_unpriv("attempt to corrupt spilled")
__retval(POINTER_VALUE)
__naked void check_corrupted_spill_fill_lsb(void)
{
asm volatile (" \
*(u64*)(r10 - 8) = r1; \
r0 = 0xcafe; \
*(u16*)(r10 - 8) = r0; \
r0 = *(u64*)(r10 - 8); \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("check corrupted spill/fill, MSB")
__success __failure_unpriv __msg_unpriv("attempt to corrupt spilled")
__retval(POINTER_VALUE)
__naked void check_corrupted_spill_fill_msb(void)
{
asm volatile (" \
*(u64*)(r10 - 8) = r1; \
r0 = 0x12345678; \
*(u32*)(r10 - 4) = r0; \
r0 = *(u64*)(r10 - 8); \
exit; \
" ::: __clobber_all);
}
SEC("tc")
__description("Spill and refill a u32 const scalar. Offset to skb->data")
__success __retval(0)
__naked void scalar_offset_to_skb_data_1(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[__sk_buff_data]); \
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
w4 = 20; \
*(u32*)(r10 - 8) = r4; \
r4 = *(u32*)(r10 - 8); \
r0 = r2; \
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=20 */ \
r0 += r4; \
/* if (r0 > r3) R0=pkt,off=20 R2=pkt R3=pkt_end R4=20 */\
if r0 > r3 goto l0_%=; \
/* r0 = *(u32 *)r2 R0=pkt,off=20,r=20 R2=pkt,r=20 R3=pkt_end R4=20 */\
r0 = *(u32*)(r2 + 0); \
l0_%=: 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))
: __clobber_all);
}
SEC("socket")
__description("Spill a u32 const, refill from another half of the uninit u32 from the stack")
/* in privileged mode reads from uninitialized stack locations are permitted */
__success __failure_unpriv
__msg_unpriv("invalid read from stack off -4+0 size 4")
__retval(0)
__naked void uninit_u32_from_the_stack(void)
{
asm volatile (" \
w4 = 20; \
*(u32*)(r10 - 8) = r4; \
/* r4 = *(u32 *)(r10 -4) fp-8=????rrrr*/ \
r4 = *(u32*)(r10 - 4); \
r0 = 0; \
exit; \
" ::: __clobber_all);
}
SEC("tc")
__description("Spill a u32 const scalar. Refill as u16. Offset to skb->data")
__failure __msg("invalid access to packet")
__naked void u16_offset_to_skb_data(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[__sk_buff_data]); \
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
w4 = 20; \
*(u32*)(r10 - 8) = r4; \
r4 = *(u16*)(r10 - 8); \
r0 = r2; \
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
r0 += r4; \
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
if r0 > r3 goto l0_%=; \
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
r0 = *(u32*)(r2 + 0); \
l0_%=: 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))
: __clobber_all);
}
SEC("tc")
__description("Spill u32 const scalars. Refill as u64. Offset to skb->data")
__failure __msg("invalid access to packet")
__naked void u64_offset_to_skb_data(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[__sk_buff_data]); \
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
w6 = 0; \
w7 = 20; \
*(u32*)(r10 - 4) = r6; \
*(u32*)(r10 - 8) = r7; \
r4 = *(u16*)(r10 - 8); \
r0 = r2; \
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
r0 += r4; \
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
if r0 > r3 goto l0_%=; \
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
r0 = *(u32*)(r2 + 0); \
l0_%=: 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))
: __clobber_all);
}
SEC("tc")
__description("Spill a u32 const scalar. Refill as u16 from fp-6. Offset to skb->data")
__failure __msg("invalid access to packet")
__naked void _6_offset_to_skb_data(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[__sk_buff_data]); \
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
w4 = 20; \
*(u32*)(r10 - 8) = r4; \
r4 = *(u16*)(r10 - 6); \
r0 = r2; \
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
r0 += r4; \
/* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
if r0 > r3 goto l0_%=; \
/* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
r0 = *(u32*)(r2 + 0); \
l0_%=: 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))
: __clobber_all);
}
SEC("tc")
__description("Spill and refill a u32 const scalar at non 8byte aligned stack addr. Offset to skb->data")
__failure __msg("invalid access to packet")
__naked void addr_offset_to_skb_data(void)
{
asm volatile (" \
r2 = *(u32*)(r1 + %[__sk_buff_data]); \
r3 = *(u32*)(r1 + %[__sk_buff_data_end]); \
w4 = 20; \
*(u32*)(r10 - 8) = r4; \
*(u32*)(r10 - 4) = r4; \
r4 = *(u32*)(r10 - 4); \
r0 = r2; \
/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=U32_MAX */\
r0 += r4; \
/* if (r0 > r3) R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */\
if r0 > r3 goto l0_%=; \
/* r0 = *(u32 *)r2 R0=pkt,umax=U32_MAX R2=pkt R3=pkt_end R4= */\
r0 = *(u32*)(r2 + 0); \
l0_%=: 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))
: __clobber_all);
}
SEC("tc")
__description("Spill and refill a umax=40 bounded scalar. Offset to skb->data")
__success __retval(0)
__naked void scalar_offset_to_skb_data_2(void)
{
asm volatile (" \
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 */ \
r2 += r4; \
/* r0 = r2 R2=pkt,umax=40 R4=umax=40 */ \
r0 = r2; \
/* r2 += 20 R0=pkt,umax=40 R2=pkt,umax=40 */ \
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";
tools/testing/selftests/bpf/verifier/spill_fill.c deleted 100644 → 0
View file @ b7e42030
{
"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,
},
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