712fc9803a
Summary: This is an initial implementation of a Hardened Allocator based on Sanitizer Common's CombinedAllocator. It aims at mitigating heap based vulnerabilities by adding several features to the base allocator, while staying relatively fast. The following were implemented: - additional consistency checks on the allocation function parameters and on the heap chunks; - use of checksum protected chunk header, to detect corruption; - randomness to the allocator base; - delayed freelist (quarantine), to mitigate use after free and overall determinism. Additional mitigations are in the works. Reviewers: eugenis, aizatsky, pcc, krasin, vitalybuka, glider, dvyukov, kcc Subscribers: kubabrecka, filcab, llvm-commits Differential Revision: http://reviews.llvm.org/D20084 llvm-svn: 271968
39 lines
992 B
C++
39 lines
992 B
C++
// RUN: %clang_scudo %s -o %t
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// RUN: not %run %t malloc 2>&1 | FileCheck %s
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// RUN: SCUDO_OPTIONS=QuarantineSizeMb=1 not %run %t quarantine 2>&1 | FileCheck %s
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// Tests that header corruption of an allocated or quarantined chunk is caught.
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char **argv)
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{
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assert(argc == 2);
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if (!strcmp(argv[1], "malloc")) {
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// Simulate a header corruption of an allocated chunk (1-bit)
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void *p = malloc(1U << 4);
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if (!p)
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return 1;
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((char *)p)[-1] ^= 1;
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free(p);
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}
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if (!strcmp(argv[1], "quarantine")) {
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void *p = malloc(1U << 4);
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if (!p)
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return 1;
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free(p);
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// Simulate a header corruption of a quarantined chunk
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((char *)p)[-2] ^= 1;
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// Trigger the quarantine recycle
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for (int i = 0; i < 0x100; i++) {
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p = malloc(1U << 16);
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free(p);
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}
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}
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return 0;
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}
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// CHECK: ERROR: corrupted chunk header at address
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