From: Andy Lutomirski Date: Tue, 8 Nov 2011 00:33:40 +0000 (-0800) Subject: x86-64: Set siginfo and context on vsyscall emulation faults X-Git-Tag: v3.3-rc1~188^2~19 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4fc3490114bb159bd4fff1b3c96f4320fe6fb08f;p=pandora-kernel.git x86-64: Set siginfo and context on vsyscall emulation faults To make this work, we teach the page fault handler how to send signals on failed uaccess. This only works for user addresses (kernel addresses will never hit the page fault handler in the first place), so we need to generate signals for those separately. This gets the tricky case right: if the user buffer spans multiple pages and only the second page is invalid, we set cr2 and si_addr correctly. UML relies on this behavior to "fault in" pages as needed. We steal a bit from thread_info.uaccess_err to enable this. Before this change, uaccess_err was a 32-bit boolean value. This fixes issues with UML when vsyscall=emulate. Reported-by: Adrian Bunk Signed-off-by: Andy Lutomirski Cc: richard -rw- weinberger Cc: H. Peter Anvin Cc: Linus Torvalds Link: http://lkml.kernel.org/r/4c8f91de7ec5cd2ef0f59521a04e1015f11e42b4.1320712291.git.luto@amacapital.net Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed