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Differential D44702

uipc_shm: Copyin userpath for ktrace(2)
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Authored by jfree on Apr 9 2024, 9:54 PM.
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markj
Commits
rGd0ca50b414be: uipc_shm: Copyin userpath for ktrace(2)
rGb112232e4fb9: uipc_shm: Copyin userpath for ktrace(2)
Summary

If userpath is not SHM_ANON, then copy it in early so ktrace(2) can
record it. Without this change, ktrace(2) will attempt to strcpy a
userspace string and trigger a page fault.

Reported by: syzbot+490b9c2a89f53b1b9779@syzkaller.appspotmail.com
Fixes: 0cd9cde767c3
Approved by: markj (mentor)
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

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rG FreeBSD src repository
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sys/
kern/
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sys/kern/uipc_shm.c

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