Messages in this thread Patch in this message | | | From | Xie XiuQi <> | Subject | [PATCH] module: check vermagic match exactly when load modules | Date | Wed, 9 Dec 2015 21:34:04 +0800 |
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Usually, checking kernel version will be ignore when loading modules if CONFIG_MODVERSIONS option is enable. This could potentially lead to a mismatch with the running kernel.
With this option, we prevent to load the modules which vermagic is not match exactly with the running kernel.
It could be set to N by default.
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com> --- init/Kconfig | 11 +++++++++++ kernel/module.c | 2 ++ 2 files changed, 13 insertions(+)
diff --git a/init/Kconfig b/init/Kconfig index c24b6f7..ce9c23e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1889,6 +1889,17 @@ config MODVERSIONS make them incompatible with the kernel you are running. If unsure, say N. +config MODULE_VERMAGIC_FORCE + bool "Require vermagic match exactly" + default n + depends on MODVERSIONS + help + Usually, checking kernel version will be ignore when loading + modules if CONFIG_MODVERSIONS option is enable. This could + potentially lead to a mismatch with the running kernel. + With this option, we prevent to load the modules which vermagic + is not match exactly with the running kernel. If unsure, say N. + config MODULE_SRCVERSION_ALL bool "Source checksum for all modules" help diff --git a/kernel/module.c b/kernel/module.c index 8f051a1..cf350d5 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1350,10 +1350,12 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs, static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) { +#ifndef CONFIG_MODULE_VERMAGIC_FORCE if (has_crcs) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); } +#endif return strcmp(amagic, bmagic) == 0; } #else -- 1.8.3.1
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