On 7/7/23 01:20, RuiRui Yang wrote:
On Tue, 4 Jul 2023 at 05:58, Tushar Sugandhi <tusharsu@xxxxxxxxxxxxxxxxxxx> wrote:The kexec_file_load syscall is used to load a new kernel for kexec. The syscall needs to update its function to call ima_kexec_post_load, which was implemented in a previous patch. ima_kexec_post_load takes care of mapping the measurement list for the next kernel and registering a reboot notifier if it's not already registered. Modify the kexec_file_load syscall to call ima_kexec_post_load after the image has been loaded and prepared for kexec. This ensures that the IMA measurement list will be available to the next kernel after a kexec reboot. This also ensures the measurements taken in the window between kexec load and execute are captured and passed to the next kernel. Declare the kimage_file_post_load function in the kernel/kexec_internal.h, so it can be properly used in the syscall. Signed-off-by: Tushar Sugandhi <tusharsu@xxxxxxxxxxxxxxxxxxx> --- kernel/kexec_file.c | 7 +++++++ kernel/kexec_internal.h | 1 + 2 files changed, 8 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index f989f5f1933b..efe28e77280c 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -184,6 +184,11 @@ kimage_validate_signature(struct kimage *image) } #endif +void kimage_file_post_load(struct kimage *image) +{ + ima_kexec_post_load(image); +} + /* * In file mode list of segments is prepared by kernel. Copy relevant * data from user space, do error checking, prepare segment list @@ -399,6 +404,8 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, kimage_terminate(image); + kimage_file_post_load(image);I think it should be only done for the reboot case, please just exclude the kdump case here..
Thanks for the feedback RuiRui. Appreciate it. Conceptually I agree with you that this needs to be done only for reboot. I need to figure out how to do it implementation wise. If you can give me pointers/suggestions, that would help. ~Tushar
+ ret = machine_kexec_post_load(image); if (ret) goto out; diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h index 74da1409cd14..98dd5fcafaf0 100644 --- a/kernel/kexec_internal.h +++ b/kernel/kexec_internal.h @@ -30,6 +30,7 @@ static inline void kexec_unlock(void) #ifdef CONFIG_KEXEC_FILE #include <linux/purgatory.h> +void kimage_file_post_load(struct kimage *image); void kimage_file_post_load_cleanup(struct kimage *image); extern char kexec_purgatory[]; extern size_t kexec_purgatory_size; -- 2.25.1 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
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