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mem: Don't unpoison the header of a Small_Stack allocation

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Feoramund
2025-06-15 12:34:15 -04:00
parent 5798151a0e
commit 8f68c46467
1 changed files with 4 additions and 2 deletions
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core/mem/allocators.odin
+4 -2
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@@ -1329,7 +1329,7 @@ This procedure allocates `size` bytes of memory aligned to a boundary specified
by `alignment`. The allocated memory is not explicitly zero-initialized. This by `alignment`. The allocated memory is not explicitly zero-initialized. This
procedure returns a slice of the allocated memory region. procedure returns a slice of the allocated memory region.
*/ */
@(require_results) @(require_results, no_sanitize_address)
small_stack_alloc_bytes_non_zeroed :: proc( small_stack_alloc_bytes_non_zeroed :: proc(
s: ^Small_Stack, s: ^Small_Stack,
size: int, size: int,
@@ -1349,8 +1349,10 @@ small_stack_alloc_bytes_non_zeroed :: proc(
s.offset += padding s.offset += padding
next_addr := curr_addr + uintptr(padding) next_addr := curr_addr + uintptr(padding)
header := (^Small_Stack_Allocation_Header)(next_addr - size_of(Small_Stack_Allocation_Header)) header := (^Small_Stack_Allocation_Header)(next_addr - size_of(Small_Stack_Allocation_Header))
sanitizer.address_unpoison(header)
header.padding = auto_cast padding header.padding = auto_cast padding
// We must poison the header, no matter what its state is, because there
// may have been an out-of-order free before this point.
sanitizer.address_poison(header)
s.offset += size s.offset += size
s.peak_used = max(s.peak_used, s.offset) s.peak_used = max(s.peak_used, s.offset)
result := byte_slice(rawptr(next_addr), size) result := byte_slice(rawptr(next_addr), size)