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bug#30918: Don't use syscall() to call renameat2()

From: Paul Eggert
Subject: bug#30918: Don't use syscall() to call renameat2()
Date: Fri, 23 Mar 2018 12:02:36 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 03/23/2018 10:38 AM, Ross Burton wrote:
Please consider
changing renameat2.c so that it doesn't hit syscall() if the wrapper isn't

That would reintroduce race-condition security holes in the ordinary build of GNU Coreutils on GNU/Linux, which would not be a good thing. Instead, how about fixing fakeroot so that it traps 'syscall' and fails with errno == ENOTSUP? Better yet, fix fakeroot so that it implements the renameat2 semantics with that syscall. (Or even better, add renameat2 to both glibc and fakeroot. :-)

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