From: Eric Paris Date: Thu, 23 Oct 2014 04:04:03 +0000 (-0400) Subject: i386/audit: stop scribbling on the stack frame X-Git-Tag: omap-for-v3.19/fixes-not-urgent-part1~28^2~6 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26c2d2b39128adba276d140eefa2745591b88536;p=pandora-kernel.git i386/audit: stop scribbling on the stack frame git commit b4f0d3755c5e9cc86292d5fd78261903b4f23d4a was very very dumb. It was writing over %esp/pt_regs semi-randomly on i686 with the expected "system can't boot" results. As noted in: https://bugs.freedesktop.org/show_bug.cgi?id=85277 This patch stops fscking with pt_regs. Instead it sets up the registers for the call to __audit_syscall_entry in the most obvious conceivable way. It then does just a tiny tiny touch of magic. We need to get what started in PT_EDX into 0(%esp) and PT_ESI into 4(%esp). This is as easy as a pair of pushes. After the call to __audit_syscall_entry all we need to do is get that now useless junk off the stack (pair of pops) and reload %eax with the original syscall so other stuff can keep going about it's business. Reported-by: Paulo Zanoni Signed-off-by: Eric Paris Link: http://lkml.kernel.org/r/1414037043-30647-1-git-send-email-eparis@redhat.com Cc: Richard Guy Briggs Signed-off-by: H. Peter Anvin --- Reading git-diff-tree failed