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https://github.com/projectacrn/acrn-hypervisor.git
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5b5f1735ff
The pointer variable 'start' should be checked against NULL
right after detected it is not pointer to a space character,
otherwise the pointer variable 'end' must hold the wrong
address right after NULL if the cmdline containing trailing
whitespaces and deference the wrong address out of cmdline
string. this parsing code also been optimized and simplified.
Tracked-On: projectacrn#4250
Signed-off-by: Gary <gordon.king@intel.com>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <errno.h>
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#include <multiboot.h>
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#include <pgtable.h>
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#include <dbg_cmd.h>
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#include <logmsg.h>
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#include <vboot.h>
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#define ACRN_DBG_PARSE 6
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int32_t parse_hv_cmdline(void)
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{
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const char *start;
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const char *end = NULL;
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struct multiboot_info *mbi = NULL;
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if (boot_regs[0] != MULTIBOOT_INFO_MAGIC) {
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return -EINVAL;
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}
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mbi = (struct multiboot_info *)(hpa2hva_early((uint64_t)boot_regs[1]));
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dev_dbg(ACRN_DBG_PARSE, "Multiboot detected, flag=0x%x", mbi->mi_flags);
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if ((mbi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE) == 0U) {
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dev_dbg(ACRN_DBG_PARSE, "no hv cmdline!");
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return -EINVAL;
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}
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start = (char *)hpa2hva_early((uint64_t)mbi->mi_cmdline);
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dev_dbg(ACRN_DBG_PARSE, "hv cmdline: %s", start);
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while ((start != NULL) && ((*start) != '\0')) {
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while ((*start) == ' ')
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start++;
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if ((*start) != '\0') {
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end = start + 1;
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while ((*end != ' ') && ((*end) != '\0'))
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end++;
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if (!handle_dbg_cmd(start, (int32_t)(end - start))) {
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/* if not handled by handle_dbg_cmd, it can be handled further */
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}
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start = end;
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}
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}
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return 0;
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}
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