Differential D24333

sbappendcontrol() needs to avoid clearing M_NOTREADY on data mbufs.
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Authored by markj on Apr 7 2020, 9:53 PM.

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rS359779: sbappendcontrol() needs to avoid clearing M_NOTREADY on data mbufs.

Summary

If LOCAL_CREDS is set on a unix socket and we use sendfile, sendfile
will call uipc_send(PRUS_NOTREADY), which prepends a control message to
M_NOTREADY mbufs. uipc_send() then calls sbappendcontrol() instead of
sbappend(), and sbappendcontrol() was clearing M_NOTREADY, leading to
nasty results.

Test Plan

Ran a simple test case that previously triggers this bug and causes a kernel
panic due to an mbuf double free.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Tests Not Applicable

Event Timeline

markj created this revision.Apr 7 2020, 9:53 PM

Harbormaster completed remote builds in B30349: Diff 70321.Apr 7 2020, 9:53 PM

markj edited the test plan for this revision. (Show Details)Apr 7 2020, 9:56 PM

markj added a reviewer: glebius.

This revision was not accepted when it landed; it landed in state Needs Review.Apr 10 2020, 8:42 PM

Closed by commit rS359779: sbappendcontrol() needs to avoid clearing M_NOTREADY on data mbufs. (authored by markj). · Explain Why

This revision was automatically updated to reflect the committed changes.

markj added a commit: rS359779: sbappendcontrol() needs to avoid clearing M_NOTREADY on data mbufs..

Herald added a subscriber: imp. · View Herald TranscriptApr 10 2020, 8:42 PM

Revision Contents
Changeset List

Path

Size

head/

sys/

kern/

9 lines

2 lines

sys/

4 lines

Diff 70416

head/sys/kern/uipc_sockbuf.c

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head/sys/kern/uipc_usrreq.c

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head/sys/sys/sockbuf.h

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