On Mon, Mar 21, 2022 at 12:21:33PM +0800, Baoquan He wrote:
On 03/18/22 at 05:40pm, Coiby Xu wrote:
Commit 9ec4ecef0af7 ("kexec_file,x86,powerpc: factor out kexec_file_ops
functions") allows implementing the arch-specific implementation of kernel
image verification in kexec_file_ops->verify_sig. Currently, there is no
Looking back at the old commit 9ec4ecef0af7, it mistakenly added a
generic arch_kexec_kernel_verify_sig() which is marked as __weak,
and expects any architecture will add a arch specified version if needed.
In fact those arch specified difference has been removed by wrapping
them into each architecture's own struct kexec_file_ops methods. Means
in the commit, the generic arch_kexec_kernel_verify_sig() is unnecessary
at all.
Thanks for looking at commit 9ec4ecef0af7 for me!
Although commit 9ec4ecef0af7 added some code in arch_kexec_kernel_verify_sig
so kexec_file_ops->verify_sig can be called, this commit doesn't add __weak
arch_kexec_kernel_verify_sig itself. And kexec_file_ops isn't supposed
to replace arch-specific implementation using __weak considering s390 and x86
still make use of __weak to implement its own version of
arch_kexec_apply_relocations_add. How about the commit message as
follows?
Currently this no arch-specific implementation of
arch_kexec_kernel_verify_sig. Even if we want to add an implementation
for an architecture in the future, we can simply use "(struct
kexec_file_ops*)->verify_sig". So clean it up.
Now, you clean up that uncessary function with code change.
I think description telling above analysis could be clearer.
arch-specific implementation of arch_kexec_kernel_verify_sig. So clean it
up.
Suggested-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Coiby Xu <coxu@xxxxxxxxxx>
---
include/linux/kexec.h | 4 ----
kernel/kexec_file.c | 34 +++++++++++++---------------------
2 files changed, 13 insertions(+), 25 deletions(-)
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0c994ae37729..755fed183224 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -196,10 +196,6 @@ int arch_kexec_apply_relocations(struct purgatory_info *pi,
const Elf_Shdr *relsec,
const Elf_Shdr *symtab);
int arch_kimage_file_post_load_cleanup(struct kimage *image);
-#ifdef CONFIG_KEXEC_SIG
-int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
- unsigned long buf_len);
-#endif
int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
extern int kexec_add_buffer(struct kexec_buf *kbuf);
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 8347fc158d2b..3720435807eb 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -89,25 +89,6 @@ int __weak arch_kimage_file_post_load_cleanup(struct kimage *image)
return kexec_image_post_load_cleanup_default(image);
}
-#ifdef CONFIG_KEXEC_SIG
-static int kexec_image_verify_sig_default(struct kimage *image, void *buf,
- unsigned long buf_len)
-{
- if (!image->fops || !image->fops->verify_sig) {
- pr_debug("kernel loader does not support signature verification.\n");
- return -EKEYREJECTED;
- }
-
- return image->fops->verify_sig(buf, buf_len);
-}
-
-int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
- unsigned long buf_len)
-{
- return kexec_image_verify_sig_default(image, buf, buf_len);
-}
-#endif
-
/*
* arch_kexec_apply_relocations_add - apply relocations of type RELA
* @pi: Purgatory to be relocated.
@@ -184,13 +165,24 @@ void kimage_file_post_load_cleanup(struct kimage *image)
}
#ifdef CONFIG_KEXEC_SIG
+static int kexec_image_verify_sig(struct kimage *image, void *buf,
+ unsigned long buf_len)
+{
+ if (!image->fops || !image->fops->verify_sig) {
+ pr_debug("kernel loader does not support signature verification.\n");
+ return -EKEYREJECTED;
+ }
+
+ return image->fops->verify_sig(buf, buf_len);
+}
+
static int
kimage_validate_signature(struct kimage *image)
{
int ret;
- ret = arch_kexec_kernel_verify_sig(image, image->kernel_buf,
- image->kernel_buf_len);
+ ret = kexec_image_verify_sig(image, image->kernel_buf,
+ image->kernel_buf_len);
if (ret) {
if (IS_ENABLED(CONFIG_KEXEC_SIG_FORCE)) {
--
2.34.1
--
Best regards,
Coiby
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