I can confirm this bug with overlayfs on top of tmpfs, I think it
happens when a program does fsetxattr on a file.
I was able to reproduce it with sed which uses setxattr when it creates
a new file, the shell does not do this when creating a file and does not
trigger the bug.
`touch /tmp/foo; sed -i '' /tmp/foo; cat /tmp/foo` results in EACCES
from open(2) in cat(1).
sed:
fsetxattr(4, "system.posix_acl_access",
"\2\0\0\0\1\0\6\0\377\377\377\377\4\0\4\0\377\377\377\377
\0\4\0\377\377\377\377", 28, 0) = 0
cat:
open("/tmp/foo", O_RDONLY) = -1 EACCES (Permission denied)
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https://bugs.launchpad.net/bugs/1840328
Title:
Regression in overlayfs between 4.4.0-157 and 4.4.0-159
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