linux-kernel - [tip:x86/boot] x86/KASLR: Remove unneeded boot

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Date:	Tue, 19 Apr 2016 02:31:39 -0700
From:	tip-bot for Yinghai Lu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	yinghai@...nel.org, linux-kernel@...r.kernel.org,
	dvyukov@...gle.com, torvalds@...ux-foundation.org,
	keescook@...omium.org, luto@...nel.org, bp@...e.de,
	tglx@...utronix.de, mingo@...nel.org, aryabinin@...tuozzo.com,
	dvlasenk@...hat.com, akpm@...ux-foundation.org, hpa@...or.com,
	peterz@...radead.org, brgerst@...il.com, luto@...capital.net,
	hjl.tools@...il.com, bhe@...hat.com, jpoimboe@...hat.com,
	bp@...en8.de
Subject: [tip:x86/boot] x86/KASLR: Remove unneeded boot_params argument

Commit-ID:  206f25a8319b312b9983953a308b0e38e1943c1c
Gitweb:     http://git.kernel.org/tip/206f25a8319b312b9983953a308b0e38e1943c1c
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Mon, 18 Apr 2016 09:42:11 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 19 Apr 2016 10:30:50 +0200

x86/KASLR: Remove unneeded boot_params argument

Since the boot_params can be found using the real_mode global variable,
there is no need to pass around a pointer to it. This slightly simplifies
the choose_kernel_location function and its callers.

[kees: rewrote changelog, tracked file rename]
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Baoquan He <bhe@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Borislav Petkov <bp@...e.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: H.J. Lu <hjl.tools@...il.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1460997735-24785-3-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/boot/compressed/kaslr.c | 5 ++---
 arch/x86/boot/compressed/misc.c  | 2 +-
 arch/x86/boot/compressed/misc.h  | 6 ++----
 3 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 6a9b96b..622aa88 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -295,8 +295,7 @@ static unsigned long find_random_addr(unsigned long minimum,
 	return slots_fetch_random();
 }
 
-unsigned char *choose_kernel_location(struct boot_params *boot_params,
-				      unsigned char *input,
+unsigned char *choose_kernel_location(unsigned char *input,
 				      unsigned long input_size,
 				      unsigned char *output,
 				      unsigned long output_size)
@@ -316,7 +315,7 @@ unsigned char *choose_kernel_location(struct boot_params *boot_params,
 	}
 #endif
 
-	boot_params->hdr.loadflags |= KASLR_FLAG;
+	real_mode->hdr.loadflags |= KASLR_FLAG;
 
 	/* Record the various known unsafe memory ranges. */
 	mem_avoid_init((unsigned long)input, input_size,
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 79dac17..f35ad9e 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -428,7 +428,7 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
 	 * the entire decompressed kernel plus relocation table, or the
 	 * entire decompressed kernel plus .bss and .brk sections.
 	 */
-	output = choose_kernel_location(real_mode, input_data, input_len, output,
+	output = choose_kernel_location(input_data, input_len, output,
 					output_len > run_size ? output_len
 							      : run_size);
 
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index a8c4e08..22346d5 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -67,8 +67,7 @@ int cmdline_find_option_bool(const char *option);
 
 #if CONFIG_RANDOMIZE_BASE
 /* kaslr.c */
-unsigned char *choose_kernel_location(struct boot_params *boot_params,
-				      unsigned char *input,
+unsigned char *choose_kernel_location(unsigned char *input,
 				      unsigned long input_size,
 				      unsigned char *output,
 				      unsigned long output_size);
@@ -76,8 +75,7 @@ unsigned char *choose_kernel_location(struct boot_params *boot_params,
 bool has_cpuflag(int flag);
 #else
 static inline
-unsigned char *choose_kernel_location(struct boot_params *boot_params,
-				      unsigned char *input,
+unsigned char *choose_kernel_location(unsigned char *input,
 				      unsigned long input_size,
 				      unsigned char *output,
 				      unsigned long output_size)