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authorBorislav Petkov <bp@suse.de>2016-05-07 11:59:40 +0200
committerIngo Molnar <mingo@kernel.org>2016-05-10 10:12:02 +0200
commit36a39ac967a548154a0fe44d71cb0063fa05010f (patch)
tree29f60f71e430dd277a1bb2b0ab2600680721d2d8 /arch/x86/boot
parent3a94707d7a7bb1eb82acae5fbc035247dd1ba8a5 (diff)
downloadop-kernel-dev-36a39ac967a548154a0fe44d71cb0063fa05010f.zip
op-kernel-dev-36a39ac967a548154a0fe44d71cb0063fa05010f.tar.gz
x86/boot: Comment what finalize_identity_maps() does
So it is not really obvious that finalize_identity_maps() doesn't do any finalization but it *actually* writes CR3 with the ident PGD. Comment that at the call site. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akpm@linux-foundation.org Cc: bhe@redhat.com Cc: dyoung@redhat.com Cc: jkosina@suse.cz Cc: linux-tip-commits@vger.kernel.org Cc: luto@kernel.org Cc: vgoyal@redhat.com Cc: yinghai@kernel.org Link: http://lkml.kernel.org/r/20160507100541.GA24613@pd.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/compressed/kaslr.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index f82975b..f5a138c 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -437,6 +437,8 @@ unsigned char *choose_random_location(unsigned long input,
choice = random_addr;
add_identity_map(choice, output_size);
+
+ /* This actually loads the identity pagetable on x86_64. */
finalize_identity_maps();
out:
return (unsigned char *)choice;
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