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A comment on Further hardening glibc malloc() against single byte overflows. Parent comment

Re:Further hardening glibc malloc() against single byte over... by alexfoo on Thursday May 18, 2017 @04:58AM (#14365776)
Ah, good point.

From: https://sploitfun.wordpress.com/2015/02/10/understanding-gli...

    Last 3 bits of this field contains flag information.

        PREV_INUSE (P) – This bit is set when previous chunk is allocated.
        IS_MMAPPED (M) – This bit is set when chunk is mmap’d.
        NON_MAIN_ARENA (N) – This bit is set when this chunk belongs to a thread arena.
It certainly doesn't look like those could be used against ASLR.
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