diff mbox series

[v2,2/7] kexec_file: print out debugging message if required

Message ID 20231124033642.520686-3-bhe@redhat.com
State New
Headers
Series kexec_file: print out debugging message if required |

Commit Message

Baoquan He Nov. 24, 2023, 3:36 a.m. UTC 
  Replace pr_debug() with the newly added kexec_dprintk() in kexec_file
loading related codes.

And also print out type/start/head of kimage and flags to help debug.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
 kernel/crash_core.c                | 5 ++++-
 kernel/kexec_file.c                | 7 ++++++-
 security/integrity/ima/ima_kexec.c | 2 +-
 3 files changed, 11 insertions(+), 3 deletions(-)

Comments

Joe Perches Nov. 24, 2023, 7:16 a.m. UTC | #1 
On Fri, 2023-11-24 at 11:36 +0800, Baoquan He wrote:
> Replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> loading related codes.

trivia for pr_debug -> kexec_dprintk conversions for
the entire patch set:

> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
[]
> @@ -551,9 +551,12 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
>  		phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
>  		phdr->p_align = 0;
>  		ehdr->e_phnum++;
> -		pr_debug("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
> +#ifdef CONFIG_KEXEC_FILE
> +		kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
> +			"sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
>  			phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
>  			ehdr->e_phnum, phdr->p_offset);

It's good form to rewrap continuation lines to the open parenthesis

> diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
[]
> @@ -389,11 +391,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
>  	if (ret)
>  		goto out;
>  
> +	kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
>  	for (i = 0; i < image->nr_segments; i++) {
>  		struct kexec_segment *ksegment;
>  
>  		ksegment = &image->segment[i];
> -		pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
> +		kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
>  			 i, ksegment->buf, ksegment->bufsz, ksegment->mem,
>  			 ksegment->memsz);

here too etc...
Baoquan He Nov. 24, 2023, 8:40 a.m. UTC | #2 
On 11/23/23 at 11:16pm, Joe Perches wrote:
> On Fri, 2023-11-24 at 11:36 +0800, Baoquan He wrote:
> > Replace pr_debug() with the newly added kexec_dprintk() in kexec_file
> > loading related codes.
> 
> trivia for pr_debug -> kexec_dprintk conversions for
> the entire patch set:

OK, will check all patchset and adjust the indendation, thanks.

> 
> > diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> []
> > @@ -551,9 +551,12 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
> >  		phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
> >  		phdr->p_align = 0;
> >  		ehdr->e_phnum++;
> > -		pr_debug("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
> > +#ifdef CONFIG_KEXEC_FILE
> > +		kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
> > +			"sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
> >  			phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
> >  			ehdr->e_phnum, phdr->p_offset);
> 
> It's good form to rewrap continuation lines to the open parenthesis
> 
> > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> []
> > @@ -389,11 +391,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
> >  	if (ret)
> >  		goto out;
> >  
> > +	kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
> >  	for (i = 0; i < image->nr_segments; i++) {
> >  		struct kexec_segment *ksegment;
> >  
> >  		ksegment = &image->segment[i];
> > -		pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
> > +		kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
> >  			 i, ksegment->buf, ksegment->bufsz, ksegment->mem,
> >  			 ksegment->memsz);
> 
> here too etc...
>
diff mbox series

Patch

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index efe87d501c8c..1485fd7bb67f 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -551,9 +551,12 @@  int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
 		phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
 		phdr->p_align = 0;
 		ehdr->e_phnum++;
-		pr_debug("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
+#ifdef CONFIG_KEXEC_FILE
+		kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
+			"sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
 			phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
 			ehdr->e_phnum, phdr->p_offset);
+#endif
 		phdr++;
 	}
 
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 4c35500ae40a..7ae1b0901aa4 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -206,6 +206,8 @@  kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
 	if (ret < 0)
 		return ret;
 	image->kernel_buf_len = ret;
+	kexec_dprintk("kernel: %p kernel_size: %#lx\n",
+		      image->kernel_buf, image->kernel_buf_len);
 
 	/* Call arch image probe handlers */
 	ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
@@ -389,11 +391,12 @@  SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 	if (ret)
 		goto out;
 
+	kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
 	for (i = 0; i < image->nr_segments; i++) {
 		struct kexec_segment *ksegment;
 
 		ksegment = &image->segment[i];
-		pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
+		kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
 			 i, ksegment->buf, ksegment->bufsz, ksegment->mem,
 			 ksegment->memsz);
 
@@ -408,6 +411,8 @@  SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 	if (ret)
 		goto out;
 
+	kexec_dprintk("kexec_file_load: type:%u, start:0x%lx head:0x%lx flags:0x%lx\n",
+		      image->type, image->start, image->head, flags);
 	/*
 	 * Free up any temporary buffers allocated which are not needed
 	 * after image has been loaded
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index ad133fe120db..e692624bcab3 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -129,7 +129,7 @@  void ima_add_kexec_buffer(struct kimage *image)
 	image->ima_buffer_size = kexec_segment_size;
 	image->ima_buffer = kexec_buffer;
 
-	pr_debug("kexec measurement buffer for the loaded kernel at 0x%lx.\n",
+	kexec_dprintk("kexec measurement buffer for the loaded kernel at 0x%lx.\n",
 		 kbuf.mem);
 }
 #endif /* IMA_KEXEC */