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Date: Thu, 30 Mar 2023 18:02:43 +0800
From: Matthias Görgens <>
Subject: [BUG] hasmntopt weirdness

Musl's `hasmntopt` is a bit weird.

For example, my `/proc/mounts` contains the following line:

shm /dev/shm tmpfs rw,nosuid,nodev,noexec,relatime,size=65536k,inode64 0 0

If I run `hasmntopt(entp, "suid")` on that entry with glibc, I get
NULL. In musl I get: "suid,nodev,noexec,relatime,size=65536k,inode64".

Do we have a spec for what should happen? I can find multiple
descriptions online, some of them would allow what musl does, but not
all. I don't know what's authoritative.

Arguably the musl behaviour is a bit silly by itself, and would
actively cause bugs for someone porting programs from glibc.

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