63f73c3eb9
Userspace page aliasing allows us to use middle pointer bits for tags without untagging them before syscalls or accesses. This should enable easier experimentation with HWASan on x86_64 platforms. Currently stack, global, and secondary heap tagging are unsupported. Only primary heap allocations get tagged. Note that aliasing mode will not work properly in the presence of fork(), since heap memory will be shared between the parent and child processes. This mode is non-ideal; we expect Intel LAM to enable full HWASan support on x86_64 in the future. Reviewed By: vitalybuka, eugenis Differential Revision: https://reviews.llvm.org/D98875
26 lines
861 B
C++
26 lines
861 B
C++
// RUN: %clangxx_hwasan -O0 %s -o %t
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// RUN: %env_hwasan_opts=allocator_may_return_null=0 not %run %t 2>&1 | FileCheck %s
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// RUN: %env_hwasan_opts=allocator_may_return_null=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NULL
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// UNSUPPORTED: android
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// REQUIRES: stable-runtime
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#include <stdio.h>
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#include <stdlib.h>
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extern void *aligned_alloc(size_t alignment, size_t size);
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int main() {
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void *p = aligned_alloc(17, 100);
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// CHECK: ERROR: HWAddressSanitizer: invalid alignment requested in aligned_alloc: 17
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// CHECK: {{#0 0x.* in .*}}{{aligned_alloc|memalign}}
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// CHECK: {{#1 0x.* in main .*aligned_alloc-alignment.cpp:}}[[@LINE-3]]
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// CHECK: SUMMARY: HWAddressSanitizer: invalid-aligned-alloc-alignment
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printf("pointer after failed aligned_alloc: %zd\n", (size_t)p);
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// CHECK-NULL: pointer after failed aligned_alloc: 0
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return 0;
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}
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