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mte: note why 0 tag is excluded
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@ -577,7 +577,8 @@ static void *tag_and_clear_slab_slot(struct slab_metadata *metadata, void *slot_
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// is constructed.
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// is constructed.
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u8 *slot_tags = metadata->arm_mte_tags;
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u8 *slot_tags = metadata->arm_mte_tags;
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// Tag exclusion mask
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// Tag exclusion mask. 0 tag is always excluded to detect accesses to slab memory via untagged
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// pointers. Moreover, 0 tag is excluded in bionic via PR_MTE_TAG_MASK prctl
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u64 tem = (1 << 0) | (1 << RESERVED_TAG);
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u64 tem = (1 << 0) | (1 << RESERVED_TAG);
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// current or previous tag of left neighbor or 0 if there's no left neighbor or if it was never used
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// current or previous tag of left neighbor or 0 if there's no left neighbor or if it was never used
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