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Date: Thu, 14 Apr 2016 15:28:54 -0700
From: Kees Cook <keescook@...omium.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
Yinghai Lu <yinghai@...nel.org>,
Baoquan He <bhe@...hat.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Matt Redfearn <matt.redfearn@...tec.com>,
x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Vivek Goyal <vgoyal@...hat.com>,
Andy Lutomirski <luto@...nel.org>,
lasse.collin@...aani.org,
Andrew Morton <akpm@...ux-foundation.org>,
Dave Young <dyoung@...hat.com>,
kernel-hardening@...ts.openwall.com,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 01/21] x86, KASLR: Remove unneeded boot_params argument
From: Yinghai Lu <yinghai@...nel.org>
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.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
[kees: rewrote changelog]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/x86/boot/compressed/aslr.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/aslr.c b/arch/x86/boot/compressed/aslr.c
index 6a9b96b4624d..622aa881c6ab 100644
--- a/arch/x86/boot/compressed/aslr.c
+++ b/arch/x86/boot/compressed/aslr.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 79dac1758e7c..f35ad9eb1bf1 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 3783dc3e10b3..dcf01c22400e 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
/* aslr.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)
--
2.6.3
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