734beec3d4
This lets us do two things: 1) Make setjmp and longjmp compatible with shadow call stack. To avoid leaking the shadow call stack address into memory, only the lower log2(SCS_SIZE) bits of x18 are stored to jmp_buf. This requires allocating an additional guard page so that we're guaranteed to be able to allocate a sufficiently aligned SCS. 2) SCS overflow detection. Overflows now result in a SIGSEGV instead of corrupting the allocation that comes after it. Change-Id: I04d6634f96162bf625684672a87fba8b402b7fd1 Test: bionic-unit-tests
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if __has_feature(shadow_call_stack)
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#include <gtest/gtest.h>
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#include "private/bionic_constants.h"
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int recurse2(int count);
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__attribute__((weak, noinline)) int recurse1(int count) {
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if (count != 0) return recurse2(count - 1) + 1;
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return 0;
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}
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__attribute__((weak, noinline)) int recurse2(int count) {
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if (count != 0) return recurse1(count - 1) + 1;
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return 0;
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}
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TEST(scs_test, stack_overflow) {
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ASSERT_EXIT(recurse1(SCS_SIZE), testing::KilledBySignal(SIGSEGV), "");
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}
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#endif
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