From: "Lee, Chun-Yi" Subject: [PATCH 14/18] Hibernate: applied SNAPSHOT_VERIFICATION config to switch signature check Date: Thu, 22 Aug 2013 19:01:53 +0800 Message-ID: <1377169317-5959-15-git-send-email-jlee@suse.com> References: <1377169317-5959-1-git-send-email-jlee@suse.com> Cc: linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, linux-pm@vger.kernel.org, linux-crypto@vger.kernel.org, opensuse-kernel@opensuse.org, David Howells , "Rafael J. Wysocki" , Matthew Garrett , Len Brown , Pavel Machek , Josh Boyer , Vojtech Pavlik , Matt Fleming , James Bottomley , Greg KH , JKosina@suse.com, Rusty Russell , Herbert Xu , "David S. Miller" , "H. Peter Anvin" , Michal Marek , Gary Lin , Vivek Goyal , "Lee, Chun-Yi" To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1377169317-5959-1-git-send-email-jlee@suse.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org This patch applied SNAPSHOT_VERIFICATION kernel config for switching signature check of hibernate snapshot image. Reviewed-by: Jiri Kosina Signed-off-by: Lee, Chun-Yi --- kernel/power/snapshot.c | 19 +++++++++++++++++++ kernel/power/swap.c | 30 +++++++++++++++++++----------- kernel/power/user.c | 2 ++ 3 files changed, 40 insertions(+), 11 deletions(-) diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 9e4c94b..cf3d69c 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -1052,6 +1052,8 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm) { struct zone *zone; unsigned long pfn, dst_pfn; + +#ifdef CONFIG_SNAPSHOT_VERIFICATION struct page *d_page; void *hash_buffer = NULL; struct crypto_shash *tfm; @@ -1083,6 +1085,7 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm) ret = crypto_shash_init(desc); if (ret < 0) goto error_shash; +#endif /* CONFIG_SNAPSHOT_VERIFICATION */ for_each_populated_zone(zone) { unsigned long max_zone_pfn; @@ -1102,6 +1105,7 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm) dst_pfn = memory_bm_next_pfn(copy_bm); copy_data_page(dst_pfn, pfn); +#ifdef CONFIG_SNAPSHOT_VERIFICATION /* Generate digest */ d_page = pfn_to_page(dst_pfn); if (PageHighMem(d_page)) { @@ -1116,8 +1120,10 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm) ret = crypto_shash_update(desc, hash_buffer, PAGE_SIZE); if (ret) goto error_shash; +#endif } +#ifdef CONFIG_SNAPSHOT_VERIFICATION crypto_shash_final(desc, digest); if (ret) goto error_shash; @@ -1147,9 +1153,11 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm) kfree(pks); kfree(digest); crypto_free_shash(tfm); +#endif /* CONFIG_SNAPSHOT_VERIFICATION */ return 0; +#ifdef CONFIG_SNAPSHOT_VERIFICATION error_sign: destroy_sign_key(s4_sign_key); error_key: @@ -1158,6 +1166,7 @@ error_shash: error_digest: crypto_free_shash(tfm); return ret; +#endif } /* Total number of image pages */ @@ -2321,8 +2330,10 @@ static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca, return pbe->address; } +#ifdef CONFIG_SNAPSHOT_VERIFICATION void **h_buf; void *skey_snapshot_buf; +#endif /** * snapshot_write_next - used for writing the system memory snapshot. @@ -2367,12 +2378,14 @@ int snapshot_write_next(struct snapshot_handle *handle) if (error) return error; +#ifdef CONFIG_SNAPSHOT_VERIFICATION /* Allocate void * array to keep buffer point for generate hash, * h_buf will freed in snapshot_image_verify(). */ h_buf = kmalloc(sizeof(void *) * nr_copy_pages, GFP_KERNEL); if (!h_buf) pr_err("Allocate hash buffer fail!"); +#endif error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY); if (error) @@ -2400,8 +2413,10 @@ int snapshot_write_next(struct snapshot_handle *handle) handle->sync_read = 0; if (IS_ERR(handle->buffer)) return PTR_ERR(handle->buffer); +#ifdef CONFIG_SNAPSHOT_VERIFICATION if (h_buf) *h_buf = handle->buffer; +#endif } } else { copy_last_highmem_page(); @@ -2412,11 +2427,13 @@ int snapshot_write_next(struct snapshot_handle *handle) return PTR_ERR(handle->buffer); if (handle->buffer != buffer) handle->sync_read = 0; +#ifdef CONFIG_SNAPSHOT_VERIFICATION if (h_buf) *(h_buf + (handle->cur - nr_meta_pages - 1)) = handle->buffer; /* Keep the buffer of sign key in snapshot */ if (pfn == skey_data_buf_pfn) skey_snapshot_buf = handle->buffer; +#endif } handle->cur++; return PAGE_SIZE; @@ -2449,6 +2466,7 @@ int snapshot_image_loaded(struct snapshot_handle *handle) handle->cur <= nr_meta_pages + nr_copy_pages); } +#ifdef CONFIG_SNAPSHOT_VERIFICATION int snapshot_verify_signature(u8 *digest, size_t digest_size) { struct key *s4_wake_key; @@ -2575,6 +2593,7 @@ void snapshot_fill_s4_skey(void) erase_skey_data(); pr_info("PM: Fill new s4 key to snapshot"); } +#endif /* CONFIG_SNAPSHOT_VERIFICATION */ #ifdef CONFIG_HIGHMEM /* Assumes that @buf is ready and points to a "safe" page */ diff --git a/kernel/power/swap.c b/kernel/power/swap.c index f6eaf6e..b5f8ce1 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -1004,13 +1004,17 @@ static int load_image(struct swap_map_handle *handle, snapshot_write_finalize(snapshot); if (!snapshot_image_loaded(snapshot)) ret = -ENODATA; - ret = snapshot_image_verify(); - if (ret) - pr_info("PM: snapshot signature check FAIL: %d\n", ret); +#ifdef CONFIG_SNAPSHOT_VERIFICATION else { - pr_info("PM: snapshot signature check SUCCESS!\n"); - snapshot_fill_s4_skey(); + ret = snapshot_image_verify(); + if (ret) + pr_info("PM: snapshot signature check FAIL: %d\n", ret); + else { + pr_info("PM: snapshot signature check SUCCESS!\n"); + snapshot_fill_s4_skey(); + } } +#endif } swsusp_show_speed(&start, &stop, nr_to_read, "Read"); return ret; @@ -1365,13 +1369,17 @@ out_finish: } } } - ret = snapshot_image_verify(); - if (ret) - pr_info("PM: snapshot signature check FAIL: %d\n", ret); - else { - pr_info("PM: snapshot signature check SUCCESS!\n"); - snapshot_fill_s4_skey(); +#ifdef CONFIG_SNAPSHOT_VERIFICATION + if (!ret) { + ret = snapshot_image_verify(); + if (ret) + pr_info("PM: snapshot signature check FAIL: %d\n", ret); + else { + pr_info("PM: snapshot signature check SUCCESS!\n"); + snapshot_fill_s4_skey(); + } } +#endif } swsusp_show_speed(&start, &stop, nr_to_read, "Read"); out_clean: diff --git a/kernel/power/user.c b/kernel/power/user.c index c092e81..27b21ee 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -254,6 +254,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, error = -EPERM; break; } +#ifdef CONFIG_SNAPSHOT_VERIFICATION if (!snapshot_image_verify()) { pr_info("PM: snapshot signature check SUCCESS!\n"); snapshot_fill_s4_skey(); @@ -262,6 +263,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, error = -EPERM; break; } +#endif error = hibernation_restore(data->platform_support); break; -- 1.6.4.2