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Differential D43089

ufs: Update *eofflag upon a read of an unlinked directory
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Authored by markj on Dec 18 2023, 9:15 PM.
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Reviewers
kib
mckusick
olce
Commits
rGb525eaaa4aaf: ufs: Update *eofflag upon a read of an unlinked directory
rG3e36ef48a063: ufs: Update *eofflag upon a read of an unlinked directory
rG3ff574c5e1d1: ufs: Update *eofflag upon a read of an unlinked directory
Summary

If the directory is unlinked, no further entries will be returned, but
we return no error. At least one caller (vn_dir_next_dirent()) asserts
that a VOP_READDIR call which returns no error and no entries will set
*eofflag != 0, so the current behaviour of UFS can trigger an assertion
failure.

Simply set *eofflag in this scenario.

Reported by: syzkaller

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rG FreeBSD src repository
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sys/
ufs/
ufs/
4 lines

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sys/ufs/ufs/ufs_vnops.c

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