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https://bugs.launchpad.net/bugs/1851412
Title:
Verify kexec image signatures on arm64
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Disco:
Invalid
Status in linux source package in Eoan:
Invalid
Status in linux source package in Focal:
Invalid
Bug description:
While reviewing our kernel configs in Focal, I noticed that we produce
signed arm64 kernels since Disco but don't seem to be verifying any
signatures during kexec. Specifically, CONFIG_KEXEC_IMAGE_VERIFY_SIG
is not enabled.
== Disco ==
$ git grep CONFIG_KEXEC_IMAGE_VERIFY_SIG
debian.master/debian.master/config/annotations:CONFIG_KEXEC_IMAGE_VERIFY_SIG
policy<{'arm64': 'n'}>
debian.master/config/annotations:CONFIG_KEXEC_IMAGE_VERIFY_SIG
flag<REVIEW>
debian.master/config/config.common.ubuntu:# CONFIG_KEXEC_IMAGE_VERIFY_SIG is
not set
== Eoan ==
$ git grep CONFIG_KEXEC_IMAGE_VERIFY_SIG debian.master/
debian.master/config/annotations:CONFIG_KEXEC_IMAGE_VERIFY_SIG
policy<{'arm64': 'n'}>
debian.master/config/annotations:CONFIG_KEXEC_IMAGE_VERIFY_SIG
flag<REVIEW>
debian.master/config/config.common.ubuntu:# CONFIG_KEXEC_IMAGE_VERIFY_SIG is
not set
Looking at the Ubuntu-5.3.0-19.20 tag in Eoan, it looks like the
CONFIG_KEXEC_IMAGE_VERIFY_SIG option should be enabled to perform signature
verification of kexec images:
$ cat -n arch/arm64/kernel/kexec_image.c | tail -n 15
116 #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
117 static int image_verify_sig(const char *kernel, unsigned long
kernel_len)
118 {
119 return verify_pefile_signature(kernel, kernel_len, NULL,
120
VERIFYING_KEXEC_PE_SIGNATURE);
121 }
122 #endif
123
124 const struct kexec_file_ops kexec_image_ops = {
125 .probe = image_probe,
126 .load = image_load,
127 #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
128 .verify_sig = image_verify_sig,
129 #endif
130 };
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