mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Thorsten BlumandPaul Walmsley
b954dba17b
Use the return value of strscpy() instead of calling strlen(fdt_cmdline) again and return early on string truncation. Drop the explicit size argument since early_cmdline has a fixed length, which strscpy() determines using sizeof() when the argument is omitted. Replace strlcat() with strscpy() to append CONFIG_CMDLINE. Also remove the unnecessary fdt_cmdline NULL initialization. Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Link: https://patch.msgid.link/20260504154924.141566-3-thorsten.blum@linux.dev Signed-off-by: Paul Walmsley <pjw@kernel.org>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/libfdt.h>
|
|
#include <linux/string.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/setup.h>
|
|
|
|
#include "pi.h"
|
|
|
|
static char early_cmdline[COMMAND_LINE_SIZE];
|
|
|
|
static char *get_early_cmdline(uintptr_t dtb_pa)
|
|
{
|
|
const char *fdt_cmdline;
|
|
ssize_t fdt_cmdline_size = 0;
|
|
int chosen_node;
|
|
|
|
if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
|
|
chosen_node = fdt_path_offset((void *)dtb_pa, "/chosen");
|
|
if (chosen_node >= 0) {
|
|
fdt_cmdline = fdt_getprop((void *)dtb_pa, chosen_node,
|
|
"bootargs", NULL);
|
|
if (fdt_cmdline) {
|
|
fdt_cmdline_size = strscpy(early_cmdline, fdt_cmdline);
|
|
if (fdt_cmdline_size < 0)
|
|
return early_cmdline;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
|
|
IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
|
|
fdt_cmdline_size == 0 /* CONFIG_CMDLINE_FALLBACK */)
|
|
strscpy(early_cmdline + fdt_cmdline_size, CONFIG_CMDLINE,
|
|
COMMAND_LINE_SIZE - fdt_cmdline_size);
|
|
|
|
return early_cmdline;
|
|
}
|
|
|
|
static u64 match_noXlvl(char *cmdline)
|
|
{
|
|
if (strstr(cmdline, "no4lvl"))
|
|
return SATP_MODE_39;
|
|
else if (strstr(cmdline, "no5lvl"))
|
|
return SATP_MODE_48;
|
|
|
|
return 0;
|
|
}
|
|
|
|
u64 set_satp_mode_from_cmdline(uintptr_t dtb_pa)
|
|
{
|
|
char *cmdline = get_early_cmdline(dtb_pa);
|
|
|
|
return match_noXlvl(cmdline);
|
|
}
|
|
|
|
static bool match_nokaslr(char *cmdline)
|
|
{
|
|
return strstr(cmdline, "nokaslr");
|
|
}
|
|
|
|
bool set_nokaslr_from_cmdline(uintptr_t dtb_pa)
|
|
{
|
|
char *cmdline = get_early_cmdline(dtb_pa);
|
|
|
|
return match_nokaslr(cmdline);
|
|
}
|