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Kernel: Add crash logging heuristic for uninitialized kmalloc()/kfree()

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Since we scrub both kmalloc() and kfree() with predictable values, we
can log a helpful message when hitting a crash that looks like it might
be a dereference of such scrubbed data.
This commit is contained in:
Andreas Kling 2020-02-01 10:26:05 +01:00
parent f2846e8e08
commit 8d51352b96
3 changed files with 11 additions and 2 deletions
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4
Kernel/Heap/kmalloc.cpp
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@ -166,7 +166,7 @@ void* kmalloc_impl(size_t size)
sum_alloc += a->nchunk * CHUNK_SIZE;
sum_free -= a->nchunk * CHUNK_SIZE;
#ifdef SANITIZE_KMALLOC
memset(ptr, 0xbb, (a->nchunk * CHUNK_SIZE) - sizeof(allocation_t));
memset(ptr, KMALLOC_SCRUB_BYTE, (a->nchunk * CHUNK_SIZE) - sizeof(allocation_t));
#endif
return ptr;
}
@ -199,7 +199,7 @@ void kfree(void* ptr)
sum_free += a->nchunk * CHUNK_SIZE;
#ifdef SANITIZE_KMALLOC
memset(a, 0xaa, a->nchunk * CHUNK_SIZE);
memset(a, KFREE_SCRUB_BYTE, a->nchunk * CHUNK_SIZE);
#endif
}