selftests/bpf: verifier/div_overflow.c converted to inline assembly
Test verifier/div_overflow.c automatically converted to use inline assembly. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230325025524.144043-20-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman
Alexei Starovoitov
Родитель
01a0925531
Коммит
9553de70a8
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@ -16,6 +16,7 @@
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#include "verifier_ctx_sk_msg.skel.h"
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#include "verifier_direct_stack_access_wraparound.skel.h"
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#include "verifier_div0.skel.h"
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#include "verifier_div_overflow.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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@ -54,3 +55,4 @@ void test_verifier_const_or(void) { RUN(verifier_const_or); }
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void test_verifier_ctx_sk_msg(void) { RUN(verifier_ctx_sk_msg); }
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void test_verifier_direct_stack_access_wraparound(void) { RUN(verifier_direct_stack_access_wraparound); }
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void test_verifier_div0(void) { RUN(verifier_div0); }
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void test_verifier_div_overflow(void) { RUN(verifier_div_overflow); }
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@ -0,0 +1,144 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/div_overflow.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <limits.h>
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#include "bpf_misc.h"
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/* Just make sure that JITs used udiv/umod as otherwise we get
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* an exception from INT_MIN/-1 overflow similarly as with div
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* by zero.
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*/
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SEC("tc")
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__description("DIV32 overflow, check 1")
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__success __retval(0)
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__naked void div32_overflow_check_1(void)
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{
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asm volatile (" \
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w1 = -1; \
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w0 = %[int_min]; \
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w0 /= w1; \
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exit; \
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" :
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: __imm_const(int_min, INT_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("DIV32 overflow, check 2")
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__success __retval(0)
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__naked void div32_overflow_check_2(void)
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{
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asm volatile (" \
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w0 = %[int_min]; \
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w0 /= -1; \
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exit; \
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" :
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: __imm_const(int_min, INT_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("DIV64 overflow, check 1")
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__success __retval(0)
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__naked void div64_overflow_check_1(void)
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{
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asm volatile (" \
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r1 = -1; \
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r2 = %[llong_min] ll; \
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r2 /= r1; \
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w0 = 0; \
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if r0 == r2 goto l0_%=; \
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w0 = 1; \
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l0_%=: exit; \
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" :
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: __imm_const(llong_min, LLONG_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("DIV64 overflow, check 2")
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__success __retval(0)
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__naked void div64_overflow_check_2(void)
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{
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asm volatile (" \
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r1 = %[llong_min] ll; \
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r1 /= -1; \
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w0 = 0; \
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if r0 == r1 goto l0_%=; \
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w0 = 1; \
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l0_%=: exit; \
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" :
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: __imm_const(llong_min, LLONG_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("MOD32 overflow, check 1")
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__success __retval(INT_MIN)
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__naked void mod32_overflow_check_1(void)
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{
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asm volatile (" \
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w1 = -1; \
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w0 = %[int_min]; \
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w0 %%= w1; \
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exit; \
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" :
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: __imm_const(int_min, INT_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("MOD32 overflow, check 2")
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__success __retval(INT_MIN)
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__naked void mod32_overflow_check_2(void)
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{
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asm volatile (" \
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w0 = %[int_min]; \
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w0 %%= -1; \
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exit; \
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" :
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: __imm_const(int_min, INT_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("MOD64 overflow, check 1")
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__success __retval(1)
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__naked void mod64_overflow_check_1(void)
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{
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asm volatile (" \
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r1 = -1; \
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r2 = %[llong_min] ll; \
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r3 = r2; \
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r2 %%= r1; \
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w0 = 0; \
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if r3 != r2 goto l0_%=; \
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w0 = 1; \
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l0_%=: exit; \
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" :
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: __imm_const(llong_min, LLONG_MIN)
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: __clobber_all);
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}
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SEC("tc")
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__description("MOD64 overflow, check 2")
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__success __retval(1)
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__naked void mod64_overflow_check_2(void)
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{
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asm volatile (" \
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r2 = %[llong_min] ll; \
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r3 = r2; \
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r2 %%= -1; \
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w0 = 0; \
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if r3 != r2 goto l0_%=; \
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w0 = 1; \
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l0_%=: exit; \
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" :
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: __imm_const(llong_min, LLONG_MIN)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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@ -1,110 +0,0 @@
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/* Just make sure that JITs used udiv/umod as otherwise we get
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* an exception from INT_MIN/-1 overflow similarly as with div
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* by zero.
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*/
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{
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"DIV32 overflow, check 1",
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.insns = {
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BPF_MOV32_IMM(BPF_REG_1, -1),
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BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
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BPF_ALU32_REG(BPF_DIV, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 0,
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},
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{
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"DIV32 overflow, check 2",
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.insns = {
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BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
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BPF_ALU32_IMM(BPF_DIV, BPF_REG_0, -1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 0,
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},
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{
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"DIV64 overflow, check 1",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_1, -1),
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BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
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BPF_ALU64_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_2, 1),
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BPF_MOV32_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 0,
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},
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{
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"DIV64 overflow, check 2",
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.insns = {
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BPF_LD_IMM64(BPF_REG_1, LLONG_MIN),
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BPF_ALU64_IMM(BPF_DIV, BPF_REG_1, -1),
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_1, 1),
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BPF_MOV32_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 0,
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},
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{
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"MOD32 overflow, check 1",
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.insns = {
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BPF_MOV32_IMM(BPF_REG_1, -1),
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BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
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BPF_ALU32_REG(BPF_MOD, BPF_REG_0, BPF_REG_1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = INT_MIN,
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},
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{
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"MOD32 overflow, check 2",
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.insns = {
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BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
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BPF_ALU32_IMM(BPF_MOD, BPF_REG_0, -1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = INT_MIN,
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},
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{
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"MOD64 overflow, check 1",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_1, -1),
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BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
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BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),
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BPF_ALU64_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_JMP_REG(BPF_JNE, BPF_REG_3, BPF_REG_2, 1),
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BPF_MOV32_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 1,
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},
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{
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"MOD64 overflow, check 2",
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.insns = {
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BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
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BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),
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BPF_ALU64_IMM(BPF_MOD, BPF_REG_2, -1),
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_JMP_REG(BPF_JNE, BPF_REG_3, BPF_REG_2, 1),
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BPF_MOV32_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.result = ACCEPT,
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.retval = 1,
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},
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