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8ab3820fd5
This allows decompress_kernel to return a new location for the kernel to be relocated to. Additionally, enforces CONFIG_PHYSICAL_START as the minimum relocation position when building with CONFIG_RELOCATABLE. With CONFIG_RANDOMIZE_BASE set, the choose_kernel_location routine will select a new location to decompress the kernel, though here it is presently a no-op. The kernel command line option "nokaslr" is introduced to bypass these routines. Signed-off-by: Kees Cook <keescook@chromium.org> Link: http://lkml.kernel.org/r/1381450698-28710-3-git-send-email-keescook@chromium.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
34 lines
772 B
C
34 lines
772 B
C
#include "misc.h"
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#if CONFIG_EARLY_PRINTK || CONFIG_RANDOMIZE_BASE
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static unsigned long fs;
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static inline void set_fs(unsigned long seg)
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{
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fs = seg << 4; /* shift it back */
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}
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typedef unsigned long addr_t;
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static inline char rdfs8(addr_t addr)
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{
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return *((char *)(fs + addr));
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}
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#include "../cmdline.c"
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static unsigned long get_cmd_line_ptr(void)
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{
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unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
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cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32;
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return cmd_line_ptr;
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}
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int cmdline_find_option(const char *option, char *buffer, int bufsize)
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{
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return __cmdline_find_option(get_cmd_line_ptr(), option, buffer, bufsize);
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}
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int cmdline_find_option_bool(const char *option)
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{
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return __cmdline_find_option_bool(get_cmd_line_ptr(), option);
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}
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#endif
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