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Avoid overflow in vtruncbuf()
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Authored by tuexen on Jan 6 2019, 9:33 PM.

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imp

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mckusick
kib
markj
jtl

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rS343434: MFC r342857:
rS343433: MFC r342857:
rS342857: Avoid overfow in vtruncbuf()

Summary

When running the attached test program, the kernel panics due to trunclbn becoming negative. Therefore use a larger type (int64_t).

This issue was found by running syzkaller.

Test Plan

Run the attached test program.

repro1.c225 BDownload

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Repository

rS FreeBSD src repository - subversion

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Buildable 21848

Event Timeline

tuexen created this revision.Jan 6 2019, 9:33 PM

Herald added a subscriber: imp. · View Herald TranscriptJan 6 2019, 9:33 PM

Harbormaster completed remote builds in B21848: Diff 52608.Jan 6 2019, 9:33 PM

kib accepted this revision.Jan 6 2019, 9:51 PM

This revision is now accepted and ready to land.Jan 6 2019, 9:51 PM

markj accepted this revision.Jan 6 2019, 10:11 PM

mckusick accepted this revision.Jan 6 2019, 11:26 PM

Closed by commit rS342857: Avoid overfow in vtruncbuf() (authored by tuexen). · Explain WhyJan 8 2019, 9:04 AM

This revision was automatically updated to reflect the committed changes.

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sys/

kern/

vfs_subr.c

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Diff 52608

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Avoid overflow in vtruncbuf()ClosedPublicActions