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author | 2019-08-19 17:17:42 -0700 | |
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committer | 2019-08-19 21:54:15 -0700 | |
commit | 7d31f4602f8d366072471ca138e4ea7b8edf9be0 (patch) | |
tree | d6c84bb75d5972c3c2ba086f6e7179d82f36393d /include/linux/security.h | |
parent | lockdown: Restrict /dev/{mem,kmem,port} when the kernel is locked down (diff) | |
download | linux-7d31f4602f8d366072471ca138e4ea7b8edf9be0.tar.gz linux-7d31f4602f8d366072471ca138e4ea7b8edf9be0.tar.bz2 linux-7d31f4602f8d366072471ca138e4ea7b8edf9be0.zip |
kexec_load: Disable at runtime if the kernel is locked down
The kexec_load() syscall permits the loading and execution of arbitrary
code in ring 0, which is something that lock-down is meant to prevent. It
makes sense to disable kexec_load() in this situation.
This does not affect kexec_file_load() syscall which can check for a
signature on the image to be booted.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
Acked-by: Dave Young <dyoung@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
cc: kexec@lists.infradead.org
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'include/linux/security.h')
-rw-r--r-- | include/linux/security.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/security.h b/include/linux/security.h index e5dd446ef35b..b607a8ac97fe 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -105,6 +105,7 @@ enum lockdown_reason { LOCKDOWN_NONE, LOCKDOWN_MODULE_SIGNATURE, LOCKDOWN_DEV_MEM, + LOCKDOWN_KEXEC, LOCKDOWN_INTEGRITY_MAX, LOCKDOWN_CONFIDENTIALITY_MAX, }; |