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Fix heap bins tcache from accessing invalid addresses on glibc 2.42 #1197

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Fix heap bins tcache from accessing invalid addresses on glibc 2.42 #1197

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5 changes: 5 additions & 0 deletions gef.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6981,6 +6981,11 @@ def tcachebin(self, tcache_base: int, i: int) -> tuple[GlibcTcacheChunk | None,
count = u16(gef.memory.read(tcache_base + tcache_count_size*i, 2))

chunk = dereference(tcache_base + tcache_count_size*self.TCACHE_MAX_BINS + i*gef.arch.ptrsize)

# Real heap chunk pointers are always ptrsize-aligned, so we check
# the alignment to prevent following invalid addresses.
if chunk and (int(chunk) & (gef.arch.ptrsize - 1)):
return None, count
chunk = GlibcTcacheChunk(int(chunk)) if chunk else None
return chunk, count

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