diff options
| -rw-r--r-- | kernel/kexec.c | 105 |
1 files changed, 34 insertions, 71 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 062e556..bfdda31 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -261,12 +261,20 @@ static struct kimage *do_kimage_alloc_init(void) static void kimage_free_page_list(struct list_head *list); -static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, - unsigned long nr_segments, - struct kexec_segment __user *segments) +static int kimage_alloc_init(struct kimage **rimage, unsigned long entry, + unsigned long nr_segments, + struct kexec_segment __user *segments, + unsigned long flags) { - int result; + int ret; struct kimage *image; + bool kexec_on_panic = flags & KEXEC_ON_CRASH; + + if (kexec_on_panic) { + /* Verify we have a valid entry point */ + if ((entry < crashk_res.start) || (entry > crashk_res.end)) + return -EADDRNOTAVAIL; + } /* Allocate and initialize a controlling structure */ image = do_kimage_alloc_init(); @@ -275,20 +283,26 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, image->start = entry; - result = copy_user_segment_list(image, nr_segments, segments); - if (result) + ret = copy_user_segment_list(image, nr_segments, segments); + if (ret) goto out_free_image; - result = sanity_check_segment_list(image); - if (result) + ret = sanity_check_segment_list(image); + if (ret) goto out_free_image; + /* Enable the special crash kernel control page allocation policy. */ + if (kexec_on_panic) { + image->control_page = crashk_res.start; + image->type = KEXEC_TYPE_CRASH; + } + /* * Find a location for the control code buffer, and add it * the vector of segments so that it's pages will also be * counted as destination pages. */ - result = -ENOMEM; + ret = -ENOMEM; image->control_code_page = kimage_alloc_control_pages(image, get_order(KEXEC_CONTROL_PAGE_SIZE)); if (!image->control_code_page) { @@ -296,10 +310,12 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, goto out_free_image; } - image->swap_page = kimage_alloc_control_pages(image, 0); - if (!image->swap_page) { - pr_err("Could not allocate swap buffer\n"); - goto out_free_control_pages; + if (!kexec_on_panic) { + image->swap_page = kimage_alloc_control_pages(image, 0); + if (!image->swap_page) { + pr_err("Could not allocate swap buffer\n"); + goto out_free_control_pages; + } } *rimage = image; @@ -308,60 +324,7 @@ out_free_control_pages: kimage_free_page_list(&image->control_pages); out_free_image: kfree(image); - return result; -} - -static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, - unsigned long nr_segments, - struct kexec_segment __user *segments) -{ - int result; - struct kimage *image; - - /* Verify we have a valid entry point */ - if ((entry < crashk_res.start) || (entry > crashk_res.end)) - return -EADDRNOTAVAIL; - - /* Allocate and initialize a controlling structure */ - image = do_kimage_alloc_init(); - if (!image) - return -ENOMEM; - - image->start = entry; - - /* Enable the special crash kernel control page - * allocation policy. - */ - image->control_page = crashk_res.start; - image->type = KEXEC_TYPE_CRASH; - - result = copy_user_segment_list(image, nr_segments, segments); - if (result) - goto out_free_image; - - result = sanity_check_segment_list(image); - if (result) - goto out_free_image; - - /* - * Find a location for the control code buffer, and add - * the vector of segments so that it's pages will also be - * counted as destination pages. - */ - result = -ENOMEM; - image->control_code_page = kimage_alloc_control_pages(image, - get_order(KEXEC_CONTROL_PAGE_SIZE)); - if (!image->control_code_page) { - pr_err("Could not allocate control_code_buffer\n"); - goto out_free_image; - } - - *rimage = image; - return 0; - -out_free_image: - kfree(image); - return result; + return ret; } static int kimage_is_destination_range(struct kimage *image, @@ -1004,16 +967,16 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, /* Loading another kernel to reboot into */ if ((flags & KEXEC_ON_CRASH) == 0) - result = kimage_normal_alloc(&image, entry, - nr_segments, segments); + result = kimage_alloc_init(&image, entry, nr_segments, + segments, flags); /* Loading another kernel to switch to if this one crashes */ else if (flags & KEXEC_ON_CRASH) { /* Free any current crash dump kernel before * we corrupt it. */ kimage_free(xchg(&kexec_crash_image, NULL)); - result = kimage_crash_alloc(&image, entry, - nr_segments, segments); + result = kimage_alloc_init(&image, entry, nr_segments, + segments, flags); crash_map_reserved_pages(); } if (result) |
