Date: Sun, 13 Nov 2016 22:22:50 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 214488] mqueuefs mq_setattr() leaks stack memory Message-ID: <bug-214488-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214488 Bug ID: 214488 Summary: mqueuefs mq_setattr() leaks stack memory Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: vlad902+spam@gmail.com CC: freebsd-security@FreeBSD.org Created attachment 176971 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=176971&action=edit Example trigger In kern/uipc_mqueue.c, sys_kmq_setattr() calls kern_kmq_setattr() to fill out a struct mq_attr before copying it back to userland; however, kern_kmq_setattr() does not zero the struct or clear the __reserved field, leaking 4 words worth of uninitialized stack memory. The same goes for freebsd32_kmq_setattr except it's mq_attr_to32() that does not clear __reserved in struct mq_attr32. The mqueuefs kernel module needs to be loaded to reach this code. Example code is attached to dump leaked memory. -- You are receiving this mail because: You are the assignee for the bug.
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