Re: [PATCH v4 2/2] x86/boot/KASLR: skip the specified crashkernel region

From: Borislav Petkov
Date: Wed Apr 17 2019 - 12:06:25 EST

On Wed, Apr 17, 2019 at 01:53:37PM +0800, Pingfan Liu wrote:
> Take __parse_crashkernel()->parse_crashkernel_simple() for example. If
> no offset given, then it still return 0, but crash_base is dangling.

Well, that is bad design. parse_crashkernel_simple() should return a
*separate* distinct value which denotes that @offset hasn't been passed.

Please fix that by having it return 1 or something else positive to
denote that there wasn't an [@offset] given.

And then correct that crap here:

static void __init reserve_crashkernel(void)

ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
if (ret != 0 || crash_size <= 0) {

where *two*! variables are used as return values from a single function.
That's just sloppy.



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