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https://github.com/capstone-engine/llvm-capstone.git
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81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Ensure that libunwind doesn't crash on invalid info; the Linux aarch64
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// sigreturn frame check would previously attempt to access invalid memory in
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// this scenario.
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// REQUIRES: target={{(aarch64|s390x|x86_64)-.+linux.*}}
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// GCC doesn't support __attribute__((naked)) on AArch64.
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// UNSUPPORTED: gcc
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// Inline assembly is incompatible with MSAN.
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// UNSUPPORTED: msan
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#undef NDEBUG
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#include <assert.h>
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#include <libunwind.h>
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#include <stdio.h>
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__attribute__((naked)) void bad_unwind_info() {
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#if defined(__aarch64__)
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__asm__("// not using 0 because unwinder was already resilient to that\n"
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"mov x8, #4\n"
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"stp x30, x8, [sp, #-16]!\n"
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".cfi_def_cfa_offset 16\n"
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"// purposely use incorrect offset for x30\n"
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".cfi_offset x30, -8\n"
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"bl stepper\n"
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"ldr x30, [sp], #16\n"
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".cfi_def_cfa_offset 0\n"
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".cfi_restore x30\n"
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"ret\n");
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#elif defined(__s390x__)
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__asm__("stmg %r14,%r15,112(%r15)\n"
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"mvghi 104(%r15),4\n"
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"# purposely use incorrect offset for %r14\n"
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".cfi_offset 14, -56\n"
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".cfi_offset 15, -40\n"
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"lay %r15,-160(%r15)\n"
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".cfi_def_cfa_offset 320\n"
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"brasl %r14,stepper\n"
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"lmg %r14,%r15,272(%r15)\n"
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".cfi_restore 15\n"
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".cfi_restore 14\n"
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".cfi_def_cfa_offset 160\n"
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"br %r14\n");
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#elif defined(__x86_64__)
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__asm__("pushq %rbx\n"
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".cfi_def_cfa_offset 16\n"
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"movq 8(%rsp), %rbx\n"
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"# purposely corrupt return value on stack\n"
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"movq $4, 8(%rsp)\n"
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"callq stepper\n"
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"movq %rbx, 8(%rsp)\n"
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"popq %rbx\n"
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".cfi_def_cfa_offset 8\n"
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"ret\n");
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#else
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#error This test is only supported on aarch64, s390x, or x86-64
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#endif
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}
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extern "C" void stepper() {
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unw_cursor_t cursor;
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unw_context_t uc;
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unw_getcontext(&uc);
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unw_init_local(&cursor, &uc);
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// stepping to bad_unwind_info should succeed
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assert(unw_step(&cursor) > 0);
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// stepping past bad_unwind_info should fail but not crash
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assert(unw_step(&cursor) <= 0);
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}
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int main() { bad_unwind_info(); }
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