| Message ID | 20231130023955.5257-3-bhe@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kexec_file: print out debugging message if required | expand |
On Thu, 2023-11-30 at 10:39 +0800, Baoquan He wrote: > Replace pr_debug() with the newly added kexec_dprintk() in kexec_file > loading related codes. trivia: > 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", > - phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz, > - ehdr->e_phnum, phdr->p_offset); > +#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 Perhaps run checkpatch and coalesce the format string.
On 11/29/23 at 06:52pm, Joe Perches wrote: > On Thu, 2023-11-30 at 10:39 +0800, Baoquan He wrote: > > Replace pr_debug() with the newly added kexec_dprintk() in kexec_file > > loading related codes. > > trivia: > > > 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", > > - phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz, > > - ehdr->e_phnum, phdr->p_offset); > > +#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 > > Perhaps run checkpatch and coalesce the format string. Sorry for being late to reply, this comment was missed. I broke it into two because it's a too long line and not friendly for reading. I did notice there's such line breaking code. I can change it if it's not suggested. Thanks for careful checking.
diff --git a/kernel/crash_core.c b/kernel/crash_core.c index efe87d501c8c..b2531eaacd1e 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", - phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz, - ehdr->e_phnum, phdr->p_offset); +#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 aca5dac74044..76de1ac7c424 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -204,6 +204,8 @@ 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, @@ -387,13 +389,14 @@ 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", - i, ksegment->buf, ksegment->bufsz, ksegment->mem, - ksegment->memsz); + 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); ret = kimage_load_segment(image, &image->segment[i]); if (ret) @@ -406,6 +409,8 @@ 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..dadc1d138118 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -129,8 +129,8 @@ 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", - kbuf.mem); + kexec_dprintk("kexec measurement buffer for the loaded kernel at 0x%lx.\n", + kbuf.mem); } #endif /* IMA_KEXEC */
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 | 9 ++++++--- kernel/kexec_file.c | 11 ++++++++--- security/integrity/ima/ima_kexec.c | 4 ++-- 3 files changed, 16 insertions(+), 8 deletions(-)