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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#ifdef __clang__
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# pragma clang optimize off
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#else
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# pragma GCC optimize("O0")
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#endif
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#include <LibTest/TestCase.h>
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#include <signal.h>
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#include <unistd.h>
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static void signal_handler(int)
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{
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// We execute this syscall in order to force the kernel to perform the syscall precondition validation which
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// checks that we have correctly set up the stack region to match our currently implemented protections.
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getuid();
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_exit(0);
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}
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#ifdef __clang__
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Winfinite-recursion"
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#endif
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static size_t infinite_recursion(size_t input)
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{
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return infinite_recursion(input) + 1;
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}
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#ifdef __clang__
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# pragma clang diagnostic pop
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#endif
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// This test can only pass with sigaltstack correctly enabled, as otherwise the SIGSEGV signal handler itself would also fault due to the overflown stack.
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TEST_CASE(success_case)
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{
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static u8 alt_stack[SIGSTKSZ];
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stack_t ss = {
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.ss_sp = alt_stack,
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.ss_flags = 0,
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.ss_size = SIGSTKSZ,
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};
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auto res = sigaltstack(&ss, nullptr);
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EXPECT_EQ(res, 0);
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struct sigaction sa;
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sa.sa_handler = signal_handler;
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sa.sa_flags = SA_ONSTACK;
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res = sigfillset(&sa.sa_mask);
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EXPECT_EQ(res, 0);
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res = sigaction(SIGSEGV, &sa, 0);
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EXPECT_EQ(res, 0);
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(void)infinite_recursion(0);
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FAIL("Infinite recursion finished successfully");
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}
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