[Bug libc/23281] FTW_MOUNT must not rely on st_dev to check whether a file is in the same mountpoint

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23281

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
I think this is just another case where overlayfs is simply not
POSIX-conforming.  Hypothetically, what could we do about this in glibc?

Is there any other way to test whether the two files are on the same
mountpoint?  kcmp does not appear to offer this.

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