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runtime: ensure the fixalloc object size is valid
Usually, fixalloc is used to allocate small, persistent and reuseable
objects. The size is typically between range [sizeof(mlink), _FixAllocChunk].
It's rare for being out of the range. But if it did happen, we got a
hard-to-discover memory corruption. This commit prevents that situation by limiting object's size.
Change-Id: If6ef8b0831596464e0f55d09f79094b79ae08c66
GitHub-Last-Rev: cb8b1b01bb
GitHub-Pull-Request: golang/go#47395
Reviewed-on: https://go-review.googlesource.com/c/go/+/337429
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Cherry Mui <cherryyz@google.com>
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@ -50,6 +50,13 @@ type mlink struct {
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// Initialize f to allocate objects of the given size,
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// using the allocator to obtain chunks of memory.
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func (f *fixalloc) init(size uintptr, first func(arg, p unsafe.Pointer), arg unsafe.Pointer, stat *sysMemStat) {
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if size > _FixAllocChunk {
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throw("runtime: fixalloc size too large")
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}
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if min := unsafe.Sizeof(mlink{}); size < min {
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size = min
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}
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f.size = size
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f.first = first
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f.arg = arg
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