Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

On Mon, Nov 28, 2022 at 12:16:08PM -0500, Mimi Zohar wrote: On Tue, 2022-11-22 at 10:36 +0800, Coiby Xu wrote: Hi Mimi, On Mon, Nov 21, 2022 at 01:23:57PM -0500, Mimi Zohar wrote: >Hi Coiby, > >On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote: >> A kernel builder may not enable KEXEC_SIG and

Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

On Tue, 2022-11-22 at 10:36 +0800, Coiby Xu wrote: > Hi Mimi, > > On Mon, Nov 21, 2022 at 01:23:57PM -0500, Mimi Zohar wrote: > >Hi Coiby, > > > >On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote: > >> A kernel builder may not enable KEXEC_SIG and some architectures like > >> ppc64 simply don't

Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

Hi Mimi, On Mon, Nov 21, 2022 at 01:23:57PM -0500, Mimi Zohar wrote: Hi Coiby, On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote: A kernel builder may not enable KEXEC_SIG and some architectures like ppc64 simply don't have KEXEC_SIG. In these cases, unless both IMA_ARCH_POLICY and secure

Re: [PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

Hi Coiby, On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote: > A kernel builder may not enable KEXEC_SIG and some architectures like > ppc64 simply don't have KEXEC_SIG. In these cases, unless both > IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent > unsigned kernel image

[PATCH] lockdown: kexec_file: prevent unsigned kernel image when KEXEC_SIG not enabled

A kernel builder may not enable KEXEC_SIG and some architectures like ppc64 simply don't have KEXEC_SIG. In these cases, unless both IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent unsigned kernel image from being kexec'ed via the kexec_file_load syscall whereas it could