6ce34c089b
This enables HWASan interception for mmap, to prevent users from allocating in the shadow memory regions. For compatibility, it does not use pointer tagging, nor does it allow MAP_FIXED with a tagged address. This patch initializes the common interceptors, but that should be a no-op (except for the mmap interceptor), due to the disable-by-default nature of hwasan_platform_interceptors.h (from D150708). As the first patch to utilize this common interceptor machinery for HWASan, it also defines some macros (e.g., COMMON_INTERCEPT_FUNCTION) that will be useful as future interceptors are enabled. TestCases/Posix/mmap_write_exec.cpp now passes for HWASan. Reviewed By: kstoimenov, vitalybuka Differential Revision: D151262
51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
// RUN: %clangxx %s -o %t
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// RUN: %env_tool_opts=detect_write_exec=1 %run %t 2>&1 | FileCheck %s
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// RUN: %env_tool_opts=detect_write_exec=0 %run %t 2>&1 | FileCheck %s \
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// RUN: --check-prefix=CHECK-DISABLED
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// ubsan and lsan do not install mmap interceptors UNSUPPORTED: ubsan, lsan
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// TODO: Fix option on Android, it hangs there for unknown reasons.
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// XFAIL: android
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#if defined(__APPLE__)
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#include <Availability.h>
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#endif
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#include <pthread.h>
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#include <stdio.h>
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#include <sys/mman.h>
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int main(int argc, char **argv) {
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char *p = (char *)mmap(0, 1024, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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// CHECK: WARNING: {{.*}}Sanitizer: writable-executable page usage
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// CHECK: #{{[0-9]+.*}}main{{.*}}mmap_write_exec.cpp:[[@LINE-3]]
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// CHECK: SUMMARY: {{.*}}Sanitizer: w-and-x-usage
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char *q = (char *)mmap(p, 64, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
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(void)mprotect(q, 64, PROT_WRITE | PROT_EXEC);
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// CHECK: WARNING: {{.*}}Sanitizer: writable-executable page usage
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// CHECK: #{{[0-9]+.*}}main{{.*}}mmap_write_exec.cpp:[[@LINE-2]]
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// CHECK: SUMMARY: {{.*}}Sanitizer: w-and-x-usage
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char *a = (char *)mmap(0, 1024, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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char *b = (char *)mmap(a, 64, PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
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(void)mprotect(q, 64, PROT_READ | PROT_EXEC);
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// CHECK-NOT: Sanitizer
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#if defined(__APPLE__)
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# if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
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__MAC_OS_X_VERSION_MIN_REQUIRED >= 110000)
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pthread_jit_write_protect_np(false);
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# endif
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char *c = (char *)mmap(0, 128, PROT_WRITE | PROT_EXEC,
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MAP_ANONYMOUS | MAP_PRIVATE | MAP_JIT, -1, 0);
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// CHECK-NOT: Sanitizer
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#endif
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printf("done\n");
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// CHECK-DISABLED-NOT: Sanitizer
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// CHECK-DISABLED: done
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}
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