| commit | 968a3bb156424a9e4ea7aa1eb2779b6e86b5a63e | |
| author | Dave Hansen <dave.hansen@linux.intel.com> | |
| Sat, 6 Jan 2018 17:41:14 +0000 (6 18:41 +0100) | ||
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
| Wed, 17 Jan 2018 08:45:28 +0000 (17 09:45 +0100) | ||
| tree | ca9397ce7b52c206ed0cbf59fbb4874284085443 | treesnapshot (tar.gz zip) |
| parent | e0d753568c16f123e4805b7136734f3a83403fb6 | commitdiff |
x86/tboot: Unbreak tboot with PTI enabled
commit 262b6b30087246abf09d6275eb0c0dc421bcbe38 upstream.
This is another case similar to what EFI does: create a new set of
page tables, map some code at a low address, and jump to it. PTI
mistakes this low address for userspace and mistakenly marks it
non-executable in an effort to make it unusable for userspace.
Undo the poison to allow execution.
Fixes: 385ce0ea4c07 ("x86/mm/pti: Add Kconfig")
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Jon Masters <jcm@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jeff Law <law@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: David <dwmw@amazon.co.uk>
Cc: Nick Clifton <nickc@redhat.com>
Link: https://lkml.kernel.org/r/20180108102805.GK25546@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 262b6b30087246abf09d6275eb0c0dc421bcbe38 upstream.
This is another case similar to what EFI does: create a new set of
page tables, map some code at a low address, and jump to it. PTI
mistakes this low address for userspace and mistakenly marks it
non-executable in an effort to make it unusable for userspace.
Undo the poison to allow execution.
Fixes: 385ce0ea4c07 ("x86/mm/pti: Add Kconfig")
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Jon Masters <jcm@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jeff Law <law@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: David <dwmw@amazon.co.uk>
Cc: Nick Clifton <nickc@redhat.com>
Link: https://lkml.kernel.org/r/20180108102805.GK25546@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| arch/x86/kernel/tboot.c | diffblobblamehistory |