80 lines
2.3 KiB
Diff
80 lines
2.3 KiB
Diff
From b91a8942f1d391fcc050188d2334b288f1e7b642 Mon Sep 17 00:00:00 2001
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From: Alexey Min <alexey.min@gmail.com>
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Date: Wed, 11 Sep 2019 21:51:40 +0300
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Subject: [PATCH 8/8] Add config option to fix bootloader cmdline args
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Android bootloader passes some arguments in kernel command
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line, that make booting custom OSes harder:
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* skip_initramfs
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* root=PARTUUID=...
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* init=/init
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Those parameters override default boot partition to hardcoded,
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set init binary to /init, disable booting from initramfs.
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If enabled, those parameters will be erased from bootloader's
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command line, and custom OS can boot the way it likes.
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Signed-off-by: Alexey Min <alexey.min@gmail.com>
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---
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arch/arm64/Kconfig | 17 +++++++++++++++++
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drivers/of/fdt.c | 14 ++++++++++++++
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2 files changed, 31 insertions(+)
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diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
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index 29035f3a..87d86b98 100644
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--- a/arch/arm64/Kconfig
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+++ b/arch/arm64/Kconfig
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@@ -1134,6 +1134,23 @@ config CMDLINE_FORCE
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command-line options your boot loader passes to the kernel.
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endchoice
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+config CMDLINE_DROP_DANGEROUS_ANDROID_OPTIONS
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+ bool "Drop certain dangerous options from cmdline"
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+ default n
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+ help
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+ Android bootloader passes some arguments in kernel command
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+ line, that make booting custom OSes harder:
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+
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+ * skip_initramfs
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+ * root=PARTUUID=...
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+ * init=/init
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+
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+ Those parameters override default boot partition to hardcoded,
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+ set init binary to /init, disable booting from initramfs.
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+
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+ If enabled, those parameters will be erased from bootloader's
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+ command line, and custom OS can boot the way it likes.
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+
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config EFI_STUB
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bool
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diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
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index 744f6250..f5d720c3 100644
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--- a/drivers/of/fdt.c
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+++ b/drivers/of/fdt.c
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@@ -1128,6 +1128,20 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
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pr_debug("Command line is: %s\n", (char*)data);
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+#ifdef CONFIG_CMDLINE_DROP_DANGEROUS_ANDROID_OPTIONS
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+ pr_err("Replacing dangerous cmdline options...");
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+ cmdline = strstr((const char *)data, "skip_initramfs");
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+ if (cmdline)
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+ *cmdline = '_';
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+ cmdline = strstr((const char *)data, "root=");
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+ if (cmdline)
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+ *cmdline = '_';
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+ cmdline = strstr((const char *)data, "init=");
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+ if (cmdline)
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+ *cmdline = '_';
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+ pr_err("Command line now is: %s\n", (char*)data);
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+#endif
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+
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/* break now */
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return 1;
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}
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--
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2.25.1
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