Date: Mon, 20 Oct 2025 16:01:54 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 290383] realpath() returns path outside chroot for "lower fs" in -o union mounts Message-ID: <bug-290383-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290383 Bug ID: 290383 Summary: realpath() returns path outside chroot for "lower fs" in -o union mounts Product: Base System Version: 15.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: equinox@diac24.net The realpath() system call returns the full path outside chroot if a "-o union" (NOT unionfs - that works correctly) mount is used, for any path that is not "unioned" in the upper file system: # cat > realpathtest.sh <<EOF #!/bin/sh # unpack base.txz to /root/base_txz chroot /root/base_txz /bin/sh -c "realpath /" chroot /root/base_txz /bin/sh -c "realpath /usr" mkdir /tmp/upper touch /tmp/upper/foobar mount -t nullfs -o union /tmp/upper /root/base_txz chroot /root/base_txz /bin/sh -c "realpath /" chroot /root/base_txz /bin/sh -c "realpath /foobar" # last one is not in the "upper" union fs: chroot /root/base_txz /bin/sh -c "realpath /usr" EOF # /bin/sh realpathtest.sh / /usr / /foobar /root/base_txz/usr # uname -a FreeBSD test 15.0-ALPHA5 FreeBSD 15.0-ALPHA5 GENERIC amd64 # (This also affects jails.) -- You are receiving this mail because: You are the assignee for the bug.home | help
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