Date: Mon, 23 Mar 2020 17:10:40 +0100 From: Julio Guerra <julio@...een.com> To: musl@...ts.openwall.com Cc: Vladimir de Turckheim <vladimir@...een.com> Subject: [Bug] Do not ignore membarrier return code Hello, The implementation of dlopen() uses membarrier() ( https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c#n1579) while currently forbidden by the default docker seccomp profile. I perfectly understand that it's on docker's end and I suggested them to add it in this PR <https://github.com/moby/moby/pull/40731> but such a critical syscall shouldn't be silently ignored. And it for example leads to random segfaults on nodejs. I also saw opened qemu issues related to membarrier + alpine. dlopen() should therefore fail when membarrier fails (ie. in this case when __membarrier(MEMBARRIER_CMD_PRIVATE_EXPEDITED, 0) != 0). Happy to provide the patch if agreed! All the best, Julio Guerra Content of type "text/html" skipped
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