kexec:i386/kexec-[bzImage|elf-x86]:x86_64/kexec-bzImage64: Use "\0" as command line instead of empty command line

This patch prevents the problems to happen below:
In setup_linux_bootloader_parameters_high
120         cmdline_ptr = ((char *)real_mode) + cmdline_offset;
121         memcpy(cmdline_ptr, cmdline, cmdline_len);
122         cmdline_ptr[cmdline_len - 1] = '\0';

if cmdline_len == 0, Line 122 will corrupt kernel16 buf just before the commandline.
And in do_bzImage_load, for example,
369         cmdline_end = setup_base + kern16_size_needed + command_line_len - 1;
370         elf_rel_set_symbol(&info->rhdr, "cmdline_end", &cmdline_end,
371                            sizeof(unsigned long));
Line 369 will go wrong, too.

Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions