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| author | Dmitry Kasatkin <d.kasatkin@samsung.com> | 2014-11-05 15:01:15 (GMT) |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2014-11-18 04:12:01 (GMT) |
| commit | c9cd2ce2bc6313aafa33f8e28d29a8690252f219 (patch) | |
| tree | 6918661e956daa2bb688ea70103df3cc8859e246 | |
| parent | fd5f4e9054acbf4f22fac81a358baf3c27aa42ac (diff) | |
| download | linux-c9cd2ce2bc6313aafa33f8e28d29a8690252f219.tar.xz | |
integrity: provide a hook to load keys when rootfs is ready
Keys can only be loaded once the rootfs is mounted. Initcalls
are not suitable for that. This patch defines a special hook
to load the x509 public keys onto the IMA keyring, before
attempting to access any file. The keys are required for
verifying the file's signature. The hook is called after the
root filesystem is mounted and before the kernel calls 'init'.
Changes in v3:
* added more explanation to the patch description (Mimi)
Changes in v2:
* Hook renamed as 'integrity_load_keys()' to handle both IMA and EVM
keys by integrity subsystem.
* Hook patch moved after defining loading functions
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
| -rw-r--r-- | include/linux/integrity.h | 6 | ||||
| -rw-r--r-- | init/main.c | 6 | ||||
| -rw-r--r-- | security/integrity/iint.c | 11 |
3 files changed, 22 insertions, 1 deletions
diff --git a/include/linux/integrity.h b/include/linux/integrity.h index 83222ce..c2d6082 100644 --- a/include/linux/integrity.h +++ b/include/linux/integrity.h @@ -24,6 +24,7 @@ enum integrity_status { #ifdef CONFIG_INTEGRITY extern struct integrity_iint_cache *integrity_inode_get(struct inode *inode); extern void integrity_inode_free(struct inode *inode); +extern void __init integrity_load_keys(void); #else static inline struct integrity_iint_cache * @@ -36,5 +37,10 @@ static inline void integrity_inode_free(struct inode *inode) { return; } + +static inline void integrity_load_keys(void) +{ +} #endif /* CONFIG_INTEGRITY */ + #endif /* _LINUX_INTEGRITY_H */ diff --git a/init/main.c b/init/main.c index e8ae1fe..2c1928d 100644 --- a/init/main.c +++ b/init/main.c @@ -78,6 +78,7 @@ #include <linux/context_tracking.h> #include <linux/random.h> #include <linux/list.h> +#include <linux/integrity.h> #include <asm/io.h> #include <asm/bugs.h> @@ -1026,8 +1027,11 @@ static noinline void __init kernel_init_freeable(void) * Ok, we have completed the initial bootup, and * we're essentially up and running. Get rid of the * initmem segments and start the user-mode stuff.. + * + * rootfs is available now, try loading the public keys + * and default modules */ - /* rootfs is available now, try loading default modules */ + integrity_load_keys(); load_default_modules(); } diff --git a/security/integrity/iint.c b/security/integrity/iint.c index dbee618..df45640 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -245,3 +245,14 @@ out: fput(file); return rc; } + +/* + * integrity_load_keys - load integrity keys hook + * + * Hooks is called from init/main.c:kernel_init_freeable() + * when rootfs is ready + */ +void __init integrity_load_keys(void) +{ + ima_load_x509(); +} |