From: Borislav Petkov <bp@xxxxxxx>
Pass them down as unsigned long directly and get rid of more casting and
assignments.
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
---
arch/x86/boot/compressed/kaslr.c | 17 ++++++-----------
arch/x86/boot/compressed/misc.c | 3 ++-
arch/x86/boot/compressed/misc.h | 10 +++++-----
3 files changed, 13 insertions(+), 17 deletions(-)
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 6392f0041b8a..a49f48317dad 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -350,20 +350,15 @@ static unsigned long find_random_addr(unsigned long minimum,
return slots_fetch_random();
}
-unsigned char *choose_random_location(unsigned char *input_ptr,
+/*
+ * Since this function examines addresses much more numerically,
+ * it takes the input and output pointers as unsigned long.
+ */
+unsigned char *choose_random_location(unsigned long input,
unsigned long input_size,
- unsigned char *output_ptr,
+ unsigned long output,
unsigned long output_size)
{
- /*
- * The caller of choose_random_location() uses unsigned char * for
- * buffer pointers since it performs decompression, elf parsing, etc.
- * Since this code examines addresses much more numerically,
- * unsigned long is used internally here. Instead of sprinkling
- * more casts into extract_kernel, do them here and at return.
- */
- unsigned long input = (unsigned long)input_ptr;
- unsigned long output = (unsigned long)output_ptr;
unsigned long choice = output;
unsigned long random_addr;
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 9536d778149e..f14db4e21654 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -366,7 +366,8 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
* the entire decompressed kernel plus relocation table, or the
* entire decompressed kernel plus .bss and .brk sections.
*/
- output = choose_random_location(input_data, input_len, output,
+ output = choose_random_location((unsigned long)input_data, input_len,
+ (unsigned long)output,
max(output_len, kernel_total_size));
/* Validate memory location choices. */
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 1f23d022d241..0112005a3f23 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -67,20 +67,20 @@ int cmdline_find_option_bool(const char *option);
#if CONFIG_RANDOMIZE_BASE
/* kaslr.c */
-unsigned char *choose_random_location(unsigned char *input_ptr,
+unsigned char *choose_random_location(unsigned long input_ptr,
unsigned long input_size,
- unsigned char *output_ptr,
+ unsigned long output_ptr,
unsigned long output_size);
/* cpuflags.c */
bool has_cpuflag(int flag);
#else
static inline
-unsigned char *choose_random_location(unsigned char *input_ptr,
+unsigned char *choose_random_location(unsigned long input_ptr,
unsigned long input_size,
- unsigned char *output_ptr,
+ unsigned long output_ptr,
unsigned long output_size)
{
- return output_ptr;
+ return (unsigned char *)output_ptr;
}
#endif
--
2.7.3
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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