Date: Thu, 5 Apr 2018 12:48:58 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r332062 - stable/11/sys/compat/linux Message-ID: <201804051248.w35Cmw0M070313@repo.freebsd.org>
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Author: emaste Date: Thu Apr 5 12:48:58 2018 New Revision: 332062 URL: https://svnweb.freebsd.org/changeset/base/332062 Log: MFC r332034: linux_ioctl_hdio: fix kernel memory disclosure Stack-allocated struct linux_hd_big_geometry has undeclared padding copied to userland. admbugs: 765 Reported by: Vlad Tsyrklevich Security: Kernel memory disclosure Sponsored by: The FreeBSD Foundation Modified: stable/11/sys/compat/linux/linux_ioctl.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/compat/linux/linux_ioctl.c ============================================================================== --- stable/11/sys/compat/linux/linux_ioctl.c Thu Apr 5 11:03:21 2018 (r332061) +++ stable/11/sys/compat/linux/linux_ioctl.c Thu Apr 5 12:48:58 2018 (r332062) @@ -253,6 +253,7 @@ linux_ioctl_hdio(struct thread *td, struct linux_ioctl } else if ((args->cmd & 0xffff) == LINUX_HDIO_GET_GEO_BIG) { struct linux_hd_big_geometry hdbg; + memset(&hdbg, 0, sizeof(hdbg)); hdbg.cylinders = fwcylinders; hdbg.heads = fwheads; hdbg.sectors = fwsectors;
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