selftests/bpf: verifier/loops1 converted to inline assembly
Test verifier/loops1 automatically converted to use inline assembly. There are a few modifications for the converted tests. "tracepoint" programs do not support test execution, change program type to "xdp" (which supports test execution) for the following tests that have __retval tags: - bounded loop, count to 4 - bonded loop containing forward jump Also, remove the __retval tag for test: - bounded loop, count from positive unknown to 4 As it's return value is a random number. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230421174234.2391278-10-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
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a6fc14dc5e
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@ -32,6 +32,7 @@
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#include "verifier_jeq_infer_not_null.skel.h"
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#include "verifier_ld_ind.skel.h"
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#include "verifier_leak_ptr.skel.h"
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#include "verifier_loops1.skel.h"
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#include "verifier_map_ptr.skel.h"
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#include "verifier_map_ret_val.skel.h"
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#include "verifier_masking.skel.h"
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@ -115,6 +116,7 @@ void test_verifier_int_ptr(void) { RUN(verifier_int_ptr); }
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void test_verifier_jeq_infer_not_null(void) { RUN(verifier_jeq_infer_not_null); }
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void test_verifier_ld_ind(void) { RUN(verifier_ld_ind); }
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void test_verifier_leak_ptr(void) { RUN(verifier_leak_ptr); }
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void test_verifier_loops1(void) { RUN(verifier_loops1); }
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void test_verifier_map_ptr(void) { RUN(verifier_map_ptr); }
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void test_verifier_map_ret_val(void) { RUN(verifier_map_ret_val); }
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void test_verifier_masking(void) { RUN(verifier_masking); }
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@ -0,0 +1,259 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/loops1.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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SEC("xdp")
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__description("bounded loop, count to 4")
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__success __retval(4)
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__naked void bounded_loop_count_to_4(void)
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{
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asm volatile (" \
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r0 = 0; \
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l0_%=: r0 += 1; \
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if r0 < 4 goto l0_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop, count to 20")
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__success
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__naked void bounded_loop_count_to_20(void)
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{
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asm volatile (" \
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r0 = 0; \
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l0_%=: r0 += 3; \
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if r0 < 20 goto l0_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop, count from positive unknown to 4")
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__success
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__naked void from_positive_unknown_to_4(void)
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{
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asm volatile (" \
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call %[bpf_get_prandom_u32]; \
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if r0 s< 0 goto l0_%=; \
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l1_%=: r0 += 1; \
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if r0 < 4 goto l1_%=; \
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l0_%=: exit; \
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" :
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: __imm(bpf_get_prandom_u32)
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: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop, count from totally unknown to 4")
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__success
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__naked void from_totally_unknown_to_4(void)
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{
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asm volatile (" \
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call %[bpf_get_prandom_u32]; \
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l0_%=: r0 += 1; \
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if r0 < 4 goto l0_%=; \
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exit; \
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" :
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: __imm(bpf_get_prandom_u32)
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: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop, count to 4 with equality")
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__success
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__naked void count_to_4_with_equality(void)
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{
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asm volatile (" \
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r0 = 0; \
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l0_%=: r0 += 1; \
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if r0 != 4 goto l0_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop, start in the middle")
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__failure __msg("back-edge")
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__naked void loop_start_in_the_middle(void)
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{
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asm volatile (" \
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r0 = 0; \
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goto l0_%=; \
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l1_%=: r0 += 1; \
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l0_%=: if r0 < 4 goto l1_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("xdp")
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__description("bounded loop containing a forward jump")
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__success __retval(4)
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__naked void loop_containing_a_forward_jump(void)
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{
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asm volatile (" \
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r0 = 0; \
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l1_%=: r0 += 1; \
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if r0 == r0 goto l0_%=; \
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l0_%=: if r0 < 4 goto l1_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded loop that jumps out rather than in")
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__success
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__naked void jumps_out_rather_than_in(void)
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{
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asm volatile (" \
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r6 = 0; \
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l1_%=: r6 += 1; \
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if r6 > 10000 goto l0_%=; \
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call %[bpf_get_prandom_u32]; \
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goto l1_%=; \
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l0_%=: exit; \
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" :
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: __imm(bpf_get_prandom_u32)
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: __clobber_all);
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}
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SEC("tracepoint")
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__description("infinite loop after a conditional jump")
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__failure __msg("program is too large")
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__naked void loop_after_a_conditional_jump(void)
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{
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asm volatile (" \
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r0 = 5; \
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if r0 < 4 goto l0_%=; \
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l1_%=: r0 += 1; \
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goto l1_%=; \
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l0_%=: exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("bounded recursion")
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__failure __msg("back-edge")
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__naked void bounded_recursion(void)
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{
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asm volatile (" \
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r1 = 0; \
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call bounded_recursion__1; \
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exit; \
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" ::: __clobber_all);
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}
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static __naked __noinline __attribute__((used))
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void bounded_recursion__1(void)
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{
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asm volatile (" \
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r1 += 1; \
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r0 = r1; \
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if r1 < 4 goto l0_%=; \
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exit; \
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l0_%=: call bounded_recursion__1; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("infinite loop in two jumps")
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__failure __msg("loop detected")
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__naked void infinite_loop_in_two_jumps(void)
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{
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asm volatile (" \
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r0 = 0; \
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l1_%=: goto l0_%=; \
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l0_%=: if r0 < 4 goto l1_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("tracepoint")
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__description("infinite loop: three-jump trick")
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__failure __msg("loop detected")
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__naked void infinite_loop_three_jump_trick(void)
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{
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asm volatile (" \
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r0 = 0; \
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l2_%=: r0 += 1; \
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r0 &= 1; \
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if r0 < 2 goto l0_%=; \
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exit; \
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l0_%=: r0 += 1; \
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r0 &= 1; \
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if r0 < 2 goto l1_%=; \
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exit; \
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l1_%=: r0 += 1; \
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r0 &= 1; \
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if r0 < 2 goto l2_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("xdp")
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__description("not-taken loop with back jump to 1st insn")
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__success __retval(123)
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__naked void back_jump_to_1st_insn_1(void)
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{
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asm volatile (" \
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l0_%=: r0 = 123; \
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if r0 == 4 goto l0_%=; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("xdp")
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__description("taken loop with back jump to 1st insn")
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__success __retval(55)
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__naked void back_jump_to_1st_insn_2(void)
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{
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asm volatile (" \
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r1 = 10; \
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r2 = 0; \
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call back_jump_to_1st_insn_2__1; \
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exit; \
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" ::: __clobber_all);
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}
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static __naked __noinline __attribute__((used))
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void back_jump_to_1st_insn_2__1(void)
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{
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asm volatile (" \
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l0_%=: r2 += r1; \
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r1 -= 1; \
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if r1 != 0 goto l0_%=; \
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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("xdp")
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__description("taken loop with back jump to 1st insn, 2")
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__success __retval(55)
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__naked void jump_to_1st_insn_2(void)
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{
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asm volatile (" \
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r1 = 10; \
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r2 = 0; \
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call jump_to_1st_insn_2__1; \
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exit; \
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" ::: __clobber_all);
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}
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static __naked __noinline __attribute__((used))
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void jump_to_1st_insn_2__1(void)
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{
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asm volatile (" \
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l0_%=: r2 += r1; \
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r1 -= 1; \
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if w1 != 0 goto l0_%=; \
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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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char _license[] SEC("license") = "GPL";
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@ -1,206 +0,0 @@
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{
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"bounded loop, count to 4",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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.retval = 4,
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},
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{
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"bounded loop, count to 20",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 3),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 20, -2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"bounded loop, count from positive unknown to 4",
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.insns = {
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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BPF_JMP_IMM(BPF_JSLT, BPF_REG_0, 0, 2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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.retval = 4,
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},
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{
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"bounded loop, count from totally unknown to 4",
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.insns = {
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"bounded loop, count to 4 with equality",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"bounded loop, start in the middle",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_A(1),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "back-edge",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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.retval = 4,
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},
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{
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"bounded loop containing a forward jump",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -3),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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.retval = 4,
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},
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{
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"bounded loop that jumps out rather than in",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_6, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),
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BPF_JMP_IMM(BPF_JGT, BPF_REG_6, 10000, 2),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
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BPF_JMP_A(-4),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"infinite loop after a conditional jump",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 5),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, 2),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_JMP_A(-2),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "program is too large",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"bounded recursion",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_1, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
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BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_1, 4, 1),
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BPF_EXIT_INSN(),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, -5),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "back-edge",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"infinite loop in two jumps",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_JMP_A(0),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 4, -2),
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BPF_EXIT_INSN(),
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},
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.result = REJECT,
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.errstr = "loop detected",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
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},
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{
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"infinite loop: three-jump trick",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
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BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 1),
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BPF_JMP_IMM(BPF_JLT, BPF_REG_0, 2, -11),
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BPF_EXIT_INSN(),
|
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},
|
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.result = REJECT,
|
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.errstr = "loop detected",
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.prog_type = BPF_PROG_TYPE_TRACEPOINT,
|
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},
|
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{
|
||||
"not-taken loop with back jump to 1st insn",
|
||||
.insns = {
|
||||
BPF_MOV64_IMM(BPF_REG_0, 123),
|
||||
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, -2),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
.retval = 123,
|
||||
},
|
||||
{
|
||||
"taken loop with back jump to 1st insn",
|
||||
.insns = {
|
||||
BPF_MOV64_IMM(BPF_REG_1, 10),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
|
||||
BPF_EXIT_INSN(),
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
|
||||
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
|
||||
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, -3),
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
.retval = 55,
|
||||
},
|
||||
{
|
||||
"taken loop with back jump to 1st insn, 2",
|
||||
.insns = {
|
||||
BPF_MOV64_IMM(BPF_REG_1, 10),
|
||||
BPF_MOV64_IMM(BPF_REG_2, 0),
|
||||
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
|
||||
BPF_EXIT_INSN(),
|
||||
BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
|
||||
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
|
||||
BPF_JMP32_IMM(BPF_JNE, BPF_REG_1, 0, -3),
|
||||
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
|
||||
BPF_EXIT_INSN(),
|
||||
},
|
||||
.result = ACCEPT,
|
||||
.prog_type = BPF_PROG_TYPE_XDP,
|
||||
.retval = 55,
|
||||
},
|
Loading…
Reference in New Issue