https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217435
--- Comment #2 from commit-h...@freebsd.org --- A commit references this bug: Author: kib Date: Sun Mar 12 13:48:25 UTC 2017 New revision: 315155 URL: https://svnweb.freebsd.org/changeset/base/315155 Log: Ktracing kevent(2) calls with unusual arguments might leads to an overly large allocation requests. When ktrace-ing io, sys_kevent() allocates memory to copy the requested changes and reported events. Allocations are sized by the incoming syscall lengths arguments, which are user-controlled, and might cause overflow in calculations or too large allocations. Since io trace chunks are limited by ktr_geniosize, there is no sense it even trying to satisfy unbounded allocations. Export ktr_geniosize and clamp the buffers sizes in advance. PR: 217435 Reported by: Tim Newsham <tim.newsham@nccgroup.trust> Sponsored by: The FreeBSD Foundation MFC after: 1 week Changes: head/sys/kern/kern_event.c head/sys/kern/kern_ktrace.c head/sys/sys/ktrace.h -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
