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
62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// RUN: %clang_scudo %s -o %t
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// RUN: SCUDO_OPTIONS=allocator_may_return_null=0 not %run %t malloc 2>&1 | FileCheck %s
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// RUN: SCUDO_OPTIONS=allocator_may_return_null=1 %run %t malloc 2>&1
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// RUN: SCUDO_OPTIONS=allocator_may_return_null=0 not %run %t calloc 2>&1 | FileCheck %s
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// RUN: SCUDO_OPTIONS=allocator_may_return_null=1 %run %t calloc 2>&1
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// RUN: %run %t usable 2>&1
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// Tests for various edge cases related to sizes, notably the maximum size the
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// allocator can allocate. Tests that an integer overflow in the parameters of
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// calloc is caught.
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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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#include <limits>
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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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// Currently the maximum size the allocator can allocate is 1ULL<<40 bytes.
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size_t size = std::numeric_limits<size_t>::max();
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void *p = malloc(size);
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if (p)
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return 1;
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size = (1ULL << 40) - 16;
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p = malloc(size);
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if (p)
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return 1;
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}
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if (!strcmp(argv[1], "calloc")) {
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// Trigger an overflow in calloc.
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size_t size = std::numeric_limits<size_t>::max();
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void *p = calloc((size / 0x1000) + 1, 0x1000);
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if (p)
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return 1;
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}
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if (!strcmp(argv[1], "usable")) {
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// Playing with the actual usable size of a chunk.
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void *p = malloc(1007);
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if (!p)
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return 1;
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size_t size = malloc_usable_size(p);
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if (size < 1007)
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return 1;
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memset(p, 'A', size);
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p = realloc(p, 2014);
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if (!p)
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return 1;
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size = malloc_usable_size(p);
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if (size < 2014)
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return 1;
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memset(p, 'B', 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: allocator is terminating the process
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