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authorMark Rutland <mark.rutland@arm.com>2022-08-17 18:40:22 +0300
committerWill Deacon <will@kernel.org>2022-08-23 13:02:02 +0300
commit2e8cff0a0eee87b27f0cf87ad8310eb41b5886ab (patch)
tree0e49a4a250de508b3ccbae0fa5e5441d641617e4 /init
parent729a916599eaf13df66ae5404f5489f38518ea8c (diff)
downloadlinux-2e8cff0a0eee87b27f0cf87ad8310eb41b5886ab.tar.xz
arm64: fix rodata=full
On arm64, "rodata=full" has been suppored (but not documented) since commit: c55191e96caa9d78 ("arm64: mm: apply r/o permissions of VM areas to its linear alias as well") As it's necessary to determine the rodata configuration early during boot, arm64 has an early_param() handler for this, whereas init/main.c has a __setup() handler which is run later. Unfortunately, this split meant that since commit: f9a40b0890658330 ("init/main.c: return 1 from handled __setup() functions") ... passing "rodata=full" would result in a spurious warning from the __setup() handler (though RO permissions would be configured appropriately). Further, "rodata=full" has been broken since commit: 0d6ea3ac94ca77c5 ("lib/kstrtox.c: add "false"/"true" support to kstrtobool()") ... which caused strtobool() to parse "full" as false (in addition to many other values not documented for the "rodata=" kernel parameter. This patch fixes this breakage by: * Moving the core parameter parser to an __early_param(), such that it is available early. * Adding an (optional) arch hook which arm64 can use to parse "full". * Updating the documentation to mention that "full" is valid for arm64. * Having the core parameter parser handle "on" and "off" explicitly, such that any undocumented values (e.g. typos such as "ful") are reported as errors rather than being silently accepted. Note that __setup() and early_param() have opposite conventions for their return values, where __setup() uses 1 to indicate a parameter was handled and early_param() uses 0 to indicate a parameter was handled. Fixes: f9a40b089065 ("init/main.c: return 1 from handled __setup() functions") Fixes: 0d6ea3ac94ca ("lib/kstrtox.c: add "false"/"true" support to kstrtobool()") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jagdish Gediya <jvgediya@linux.ibm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Will Deacon <will@kernel.org> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20220817154022.3974645-1-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/init/main.c b/init/main.c
index 91642a4e69be..1fe7942f5d4a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1446,13 +1446,25 @@ static noinline void __init kernel_init_freeable(void);
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
bool rodata_enabled __ro_after_init = true;
+
+#ifndef arch_parse_debug_rodata
+static inline bool arch_parse_debug_rodata(char *str) { return false; }
+#endif
+
static int __init set_debug_rodata(char *str)
{
- if (strtobool(str, &rodata_enabled))
+ if (arch_parse_debug_rodata(str))
+ return 0;
+
+ if (str && !strcmp(str, "on"))
+ rodata_enabled = true;
+ else if (str && !strcmp(str, "off"))
+ rodata_enabled = false;
+ else
pr_warn("Invalid option string for rodata: '%s'\n", str);
- return 1;
+ return 0;
}
-__setup("rodata=", set_debug_rodata);
+early_param("rodata", set_debug_rodata);
#endif
#ifdef CONFIG_STRICT_KERNEL_RWX