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[lkrnprefix] Copy command line before installing iPXE

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The command line may be situated in an area of base memory that will
be overwritten by iPXE's real-mode segments, causing the command line
to be corrupted before it can be used.

Fix by creating a copy of the command line on the prefix stack (below
0x7c00) before installing the real-mode segments.

Reported-by: Dave Hansen <dave@sr71.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-01-18 00:02:16 +00:00
parent 18d2887281
commit f5bbe7ec4a
2 changed files with 41 additions and 5 deletions
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3
src/arch/i386/core/runtime.c
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@@ -132,7 +132,8 @@ static int cmdline_init ( void ) {
}
cmdline = cmdline_copy;
copy_from_user ( cmdline, cmdline_user, 0, len );
DBGC ( colour, "RUNTIME found command line \"%s\"\n", cmdline );
DBGC ( colour, "RUNTIME found command line \"%s\" at %08x\n",
cmdline, cmdline_phys );
/* Strip unwanted cruft from the command line */
cmdline_strip ( cmdline, "BOOT_IMAGE=" );