drivers/firmware/efi/libstub/skip_spaces.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/ctype.h>
#include <linux/types.h>

char *skip_spaces(const char *str)
{
	while (isspace(*str))
		++str;
	return (char *)str;
}
efi/libstub: Clean up command line parsing routine We currently parse the command non-destructively, to avoid having to allocate memory for a copy before passing it to the standard parsing routines that are used by the core kernel, and which modify the input to delineate the parsed tokens with NUL characters. Instead, we call strstr() and strncmp() to go over the input multiple times, and match prefixes rather than tokens, which implies that we would match, e.g., 'nokaslrfoo' in the stub and disable KASLR, while the kernel would disregard the option and run with KASLR enabled. In order to avoid having to reason about whether and how this behavior may be abused, let's clean up the parsing routines, and rebuild them on top of the existing helpers. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> 2020-02-10 17:02:46 +01:00			`// SPDX-License-Identifier: GPL-2.0`

			`#include <linux/ctype.h>`
			`#include <linux/types.h>`

			`char skip_spaces(const char str)`
			`{`
			`while (isspace(*str))`
			`++str;`
			`return (char *)str;`
			`}`