musl - mallocng switchover - opportunity to test

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Message-ID: <20200609035010.GE1079@brightrain.aerifal.cx>
Date: Mon, 8 Jun 2020 23:50:10 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: mallocng switchover - opportunity to test

I just pushed a series of changes in preparation for upstreaming
mallocng. Before it's actually imported, it can be tested by
performing the following simple 4 steps:

1. mkdir src/malloc/mallocng
2. echo "MALLOC_DIR = mallocng" >> config.mak
3. Dropping the attached files into src/malloc/mallocng
4. Symlinking or copying meta.h, malloc.c, realloc.c, free.c,
   malloc_usable_size.c, and aligned_alloc.c from mallocng source dir
   to src/malloc/mallocng. (You can also include dump.c if desired.)

This produces a near-fully-integrated malloc, including support for
reclaim_gaps donation from ldso. The only functionality missing, which
I expect to flesh out before actual import, is handling of the case of
incomplete malloc replacement by interposition (__malloc_replaced!=0).

Please report any problems encountered.

Rich

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View attachment "replaced.c" of type "text/plain" (43 bytes)

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