From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1944) id 05926384F494; Fri, 18 Nov 2022 11:35:42 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 05926384F494 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1668771342; bh=kd4vu/p2pldppVyy+wmxzVoUNKiOlYEu/4kqVgU0uSo=; h=From:To:Subject:Date:From; b=a7fvVcmHabSPyS+Vu+rm9p3LlNgpEPcQn3EAnGJ71DdSSrnA4Qf1iB/Xgzj09e1Ej +hv6HlarlT8e9r+Uq0NYe/6ZbTeHd1axnsKXzpzyC/XM9d3haV8Dj56cuhfiigGCqb 7SX2sbaTsLwy6lBD9Rz8ncwu+VpcopK4nUioVjJI= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Szabolcs Nagy To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] morello README update X-Act-Checkin: glibc X-Git-Author: Szabolcs Nagy X-Git-Refname: refs/heads/arm/morello/main X-Git-Oldrev: 7e17dad9564c5375c45337889e6236708862e99a X-Git-Newrev: 5b8ca6cbb1fa5a53cdb64a40541d4858295e34e3 Message-Id: <20221118113542.05926384F494@sourceware.org> Date: Fri, 18 Nov 2022 11:35:42 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5b8ca6cbb1fa5a53cdb64a40541d4858295e34e3 commit 5b8ca6cbb1fa5a53cdb64a40541d4858295e34e3 Author: Szabolcs Nagy Date: Thu Nov 3 15:03:47 2022 +0000 morello README update Diff: --- manual/README.morello | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/manual/README.morello b/manual/README.morello index 8a2be21bd4..2db20724ba 100644 --- a/manual/README.morello +++ b/manual/README.morello @@ -29,7 +29,9 @@ Limitations of the morello port: - POSIX message queue async notify does not work (pointers passed via an fd). - Process shared robust mutexes don't work (pointers in shared memory). - Purecap pldd only supports purecap ABI processes (not lp64). -- malloc has significant overhead (locks and hash table lookup). +- malloc bounds narrowing has large overhead (locks and hash table lookup). +- malloc bounds narrowing can break code expecting page granularity protection. + Use GLIBC_TUNABLES=glibc.mem.cap_narrowing=0 env var as a workaround. - string functions are not optimized. -- Exectable stacks are not supported. +- Executable stacks are not supported. - Internal pointer protection and pointer mangling are disabled.