Date: Tue, 04 Aug 2009 11:36:59 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE request - kernel: information leak in sigaltstack do_sigaltstack: avoid copying 'stack_t' as a structure to user space Ulrich Drepper correctly points out that there is generally padding in the structure on 64-bit hosts, and that copying the structure from kernel to user space can leak information from the kernel stack in those padding bytes. Avoid the whole issue by just copying the three members one by one instead, which also means that the function also can avoid the need for a stack frame. This also happens to match how we copy the new structure from user space, so it all even makes sense. Upstream commit: http://git.kernel.org/linus/0083fc2c50e6c5127c2802ad323adf8143ab7856 Reference: https://bugzilla.redhat.com/show_bug.cgi?id=515392 Thanks, Eugene
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