Here is a straced syscall sequence broken by the bwrap profile:
176 openat(AT_FDCWD,
"…/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_64/steam-runtime-sniper/var/tmp-O9I2Q2",
O_RDONLY|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY) = 8
…
176 openat(8, "usr/etc", O_WRONLY|O_CLOEXEC|O_TMPFILE, 0600) = 10
176 fchmod(10, 0600) = 0
176 fallocate(10, 0, 0, 64) = 0
176 write(10, "pcm.!default {\n type pulse\n}\nctl.!default {\n type
pulse\n}\n", 64) = 64
176 fchmod(10, 0644) = 0
…
176 linkat(AT_FDCWD, "/proc/self/fd/10", 8, "usr/etc/tmp.xwx1yI",
AT_SYMLINK_FOLLOW) = -1 ENOENT (No such file or directory)
176 close(10) = 0
From
https://github.com/flathub/com.valvesoftware.Steam/issues/1318#issuecomment-2226807108
Basically, creating an anonymous file with O_TMPFILE and linking it
later (for atomicity) is broken.
This breaks the Steam Flatpak.
** Bug watch added: github.com/flathub/com.valvesoftware.Steam/issues #1318
https://github.com/flathub/com.valvesoftware.Steam/issues/1318
** Tags added: regression-update
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https://bugs.launchpad.net/bugs/2072811
Title:
Apparmor: New update broke flatpak with `apparmor="DENIED"`
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