64 lines
2.4 KiB
Diff
64 lines
2.4 KiB
Diff
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diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
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index 393eb2133243..f61bfbaa4001 100644
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -3157,6 +3157,24 @@ choice
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if you don't intend to always append a DTB.
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endchoice
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+config MIPS_BOOTLOADER_CMDLINE_REQUIRE_COOKIE
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+ bool "Ignore bootloader command-line unless cookie present"
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+ default n
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+
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+config MIPS_BOOTLOADER_CMDLINE_COOKIE
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+ string "Bootloader kernel argument cookie string"
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+ depends on MIPS_BOOTLOADER_CMDLINE_REQUIRE_COOKIE
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+ help
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+ Use bootloader command line if and only if it contains
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+ this string. Some bootloaders allow setting the command line
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+ for interactive boots but provide an incorrect (and
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+ unchangeable) default when booting unattended.
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+
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+ This option can be combined with e.g. MIPS_CMDLINE_DTB_EXTEND
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+ or MIPS_CMDLINE_BUILTIN_EXTEND: it doesn't affect
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+ where else your command line comes from, just whether
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+ the bootloader-provided command line is used as part of it.
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+
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choice
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prompt "Kernel command line type" if !CMDLINE_OVERRIDE
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default MIPS_CMDLINE_FROM_DTB if USE_OF && !ATH79 && !MACH_INGENIC && \
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diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
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index ef73ba1e0ec1..52a836c43630 100644
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--- a/arch/mips/kernel/setup.c
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+++ b/arch/mips/kernel/setup.c
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@@ -72,6 +72,12 @@ static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
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static const char builtin_cmdline[] __initconst = "";
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#endif
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+#ifdef CONFIG_MIPS_BOOTLOADER_CMDLINE_REQUIRE_COOKIE
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+static const char cmdline_cookie[] __initconst = CONFIG_MIPS_BOOTLOADER_CMDLINE_COOKIE;
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+#else
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+static const char cmdline_cookie[] __initconst = NULL;
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+#endif
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+
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/*
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* mips_io_port_base is the begin of the address space to which x86 style
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* I/O ports are mapped.
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@@ -558,6 +564,16 @@ static void __init bootcmdline_init(void)
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return;
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}
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+ /* If CMDLINE_REQUIRE_COOKIE is set to a string, we require that
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+ * string to be present in the bootloader command line, otherwise
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+ * we ignore it. This is to accommodate bootloaders that allow
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+ * the command line to be specified for interactive boots but
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+ * hardcode an incorrect command line for unattended boots */
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+#ifdef CONFIG_MIPS_BOOTLOADER_CMDLINE_REQUIRE_COOKIE
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+ if(strstr(arcs_cmdline, cmdline_cookie) == NULL) {
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+ arcs_cmdline[0] = '\0';
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+ }
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+#endif
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/*
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* If the user specified a built-in command line &
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* MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
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