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Differential D14874

Copy flags over ifr_union directly rather than via casts through ifr_data.
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Authored by brooks on Mar 27 2018, 7:04 PM.
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kib
emaste
jhb
Commits
rS332161: MFC r331651-r331653
rS331653: Copy flags over ifr_union directly rather than via casts through ifr_data.
Summary

No functional change. If the sbni driver supported 64-bit big-endian
system, this would be an ABI changes, but it is i386-only. The old version
also leaked a word of stack on 64-bit systems.

This eliminates the only assignment to ifr_data.

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rS FreeBSD src repository - subversion
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Event Timeline

brooks created this revision.Mar 27 2018, 7:04 PM
Harbormaster completed remote builds in B15835: Diff 40816.Mar 27 2018, 7:04 PM
brooks added a comment.Mar 27 2018, 7:08 PM

An alternative approach might be to add an char ifru_bytes[sizeof(struct sockaddr)] to ifreq's union and target that.

kib accepted this revision.Mar 27 2018, 8:23 PM
kib added inline comments.
sys/dev/sbni/if_sbni.c
1147 ↗(On Diff #40816)

I think this leaks a word of stack on 64bit machines.

This revision is now accepted and ready to land.Mar 27 2018, 8:23 PM
brooks added inline comments.Mar 27 2018, 8:26 PM
sys/dev/sbni/if_sbni.c
1147 ↗(On Diff #40816)

ioctl handles this for us because it copied in the whole ifreq in sys_ioctl().

brooks added inline comments.Mar 27 2018, 9:00 PM
sys/dev/sbni/if_sbni.c
1147 ↗(On Diff #40816)

No, you are right. The old one does.

brooks edited the summary of this revision. (Show Details)Mar 27 2018, 9:01 PM
Closed by commit rS331653: Copy flags over ifr_union directly rather than via casts through ifr_data. (authored by brooks). · Explain WhyMar 27 2018, 9:06 PM
This revision was automatically updated to reflect the committed changes.
Herald added a subscriber: imp. · View Herald TranscriptMar 27 2018, 9:06 PM

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head/
sys/
dev/
sbni/
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Diff 40822

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head/sys/dev/sbni/if_sbni.c

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