From: Jiri Bohac <[email protected]> When KEXEC_SIG is not enabled, kernel should not load images through kexec_file systemcall if the kernel is locked down.
[Modified by David Howells to fit with modifications to the previous patch and to return -EPERM if the kernel is locked down for consistency with other lockdowns. Modified by Matthew Garrett to remove the IMA integration, which will be replaced by integrating with the IMA architecture policy patches.] Signed-off-by: Jiri Bohac <[email protected]> Signed-off-by: David Howells <[email protected]> Signed-off-by: Matthew Garrett <[email protected]> Reviewed-by: Jiri Bohac <[email protected]> Reviewed-by: Kees Cook <[email protected]> cc: [email protected] --- kernel/kexec_file.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 875482c34154..dd06f1070d66 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -228,7 +228,10 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, goto out; } - ret = 0; + ret = security_locked_down(LOCKDOWN_KEXEC); + if (ret) + goto out; + break; /* All other errors are fatal, including nomem, unparseable -- 2.22.0.770.g0f2c4a37fd-goog
