[sanitizer] Initial implementation of a Hardened Allocator
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
2016-06-07 09:20:26 +08:00
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// RUN: %clang_scudo %s -o %t
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// RUN: %run %t valid 2>&1
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// RUN: not %run %t invalid 2>&1 | FileCheck %s
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// Tests that the various aligned allocation functions work as intended. Also
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// tests for the condition where the alignment is not a power of 2.
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#include <assert.h>
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#include <malloc.h>
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#include <stdlib.h>
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#include <string.h>
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2016-06-08 04:09:49 +08:00
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// Sometimes the headers may not have this...
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2016-06-08 07:49:11 +08:00
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extern "C" void *aligned_alloc (size_t alignment, size_t size);
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2016-06-08 04:09:49 +08:00
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[sanitizer] Initial implementation of a Hardened Allocator
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
2016-06-07 09:20:26 +08:00
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int main(int argc, char **argv)
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{
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void *p;
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size_t alignment = 1U << 12;
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size_t size = alignment;
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assert(argc == 2);
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if (!strcmp(argv[1], "valid")) {
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p = memalign(alignment, size);
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if (!p)
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return 1;
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free(p);
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p = nullptr;
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posix_memalign(&p, alignment, size);
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if (!p)
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return 1;
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free(p);
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p = aligned_alloc(alignment, size);
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if (!p)
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return 1;
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free(p);
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}
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if (!strcmp(argv[1], "invalid")) {
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p = memalign(alignment - 1, size);
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free(p);
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}
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return 0;
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}
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// CHECK: ERROR: malloc alignment is not a power of 2
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