From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + vmcore-support-mmap-on-proc-vmcore-fix.patch added to -mm tree Date: Thu, 23 May 2013 17:20:42 -0700 Message-ID: <519eb25a.yDNjXWJJSV04DqB3%akpm@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from mail.linuxfoundation.org ([140.211.169.12]:51247 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757620Ab3EXAUn (ORCPT ); Thu, 23 May 2013 20:20:43 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org, zhangyanfei@cn.fujitsu.com, vgoyal@redhat.com, lisa.mitchell@hp.com, kumagai-atsushi@mxc.nes.nec.co.jp, kosaki.motohiro@jp.fujitsu.com, d.hatayama@jp.fujitsu.com, akpm@linux-foundation.org Subject: + vmcore-support-mmap-on-proc-vmcore-fix.patch added to -mm tree To: akpm@linux-foundation.org,d.hatayama@jp.fujitsu.com,kosaki.motohiro@jp.fujitsu.com,kumagai-atsushi@mxc.nes.nec.co.jp,lisa.mitchell@hp.com,vgoyal@redhat.com,zhangyanfei@cn.fujitsu.com From: akpm@linux-foundation.org Date: Thu, 23 May 2013 17:20:42 -0700 The patch titled Subject: vmcore-support-mmap-on-proc-vmcore-fix has been added to the -mm tree. Its filename is vmcore-support-mmap-on-proc-vmcore-fix.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Andrew Morton Subject: vmcore-support-mmap-on-proc-vmcore-fix use min(), switch to conventional error-unwinding approach Cc: Atsushi Kumagai Cc: HATAYAMA Daisuke Cc: KOSAKI Motohiro Cc: Lisa Mitchell Cc: Vivek Goyal Cc: Zhang Yanfei Signed-off-by: Andrew Morton --- fs/proc/vmcore.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff -puN fs/proc/vmcore.c~vmcore-support-mmap-on-proc-vmcore-fix fs/proc/vmcore.c --- a/fs/proc/vmcore.c~vmcore-support-mmap-on-proc-vmcore-fix +++ a/fs/proc/vmcore.c @@ -218,9 +218,7 @@ static int mmap_vmcore(struct file *file if (start < elfcorebuf_sz) { u64 pfn; - tsz = elfcorebuf_sz - start; - if (size < tsz) - tsz = size; + tsz = min(elfcorebuf_sz - (size_t)start, size); pfn = __pa(elfcorebuf + start) >> PAGE_SHIFT; if (remap_pfn_range(vma, vma->vm_start, pfn, tsz, vma->vm_page_prot)) @@ -236,15 +234,11 @@ static int mmap_vmcore(struct file *file if (start < elfcorebuf_sz + elfnotes_sz) { void *kaddr; - tsz = elfcorebuf_sz + elfnotes_sz - start; - if (size < tsz) - tsz = size; + tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)start, size); kaddr = elfnotes_buf + start - elfcorebuf_sz; if (remap_vmalloc_range_partial(vma, vma->vm_start + len, - kaddr, tsz)) { - do_munmap(vma->vm_mm, vma->vm_start, len); - return -EAGAIN; - } + kaddr, tsz)) + goto fail; size -= tsz; start += tsz; len += tsz; @@ -257,16 +251,12 @@ static int mmap_vmcore(struct file *file if (start < m->offset + m->size) { u64 paddr = 0; - tsz = m->offset + m->size - start; - if (size < tsz) - tsz = size; + tsz = min_t(size_t, m->offset + m->size - start, size); paddr = m->paddr + start - m->offset; if (remap_pfn_range(vma, vma->vm_start + len, paddr >> PAGE_SHIFT, tsz, - vma->vm_page_prot)) { - do_munmap(vma->vm_mm, vma->vm_start, len); - return -EAGAIN; - } + vma->vm_page_prot)) + goto fail; size -= tsz; start += tsz; len += tsz; @@ -277,6 +267,9 @@ static int mmap_vmcore(struct file *file } return 0; +fail: + do_munmap(vma->vm_mm, vma->vm_start, len); + return -EAGAIN; } static const struct file_operations proc_vmcore_operations = { _ Patches currently in -mm which might be from akpm@linux-foundation.org are linux-next.patch linux-next-git-rejects.patch arch-alpha-kernel-systblss-remove-debug-check.patch i-need-old-gcc.patch mm-mmu_notifier-re-fix-freed-page-still-mapped-in-secondary-mmu-fix.patch drivers-video-implement-a-simple-framebuffer-driver.patch shm-fix-null-pointer-deref-when-userspace-specifies-invalid-hugepage-size-fix.patch revert-selftest-add-simple-test-for-soft-dirty-bit.patch kmsg-honor-dmesg_restrict-sysctl-on-dev-kmsg-fix.patch sound-soc-codecs-si476xc-dont-use-0bnnn.patch drivers-iommu-msm_iommu_devc-fix-leak-and-clean-up-error-paths-fix.patch posix-timers-correctly-get-dying-task-time-sample-in-posix_cpu_timer_schedule.patch mm.patch clear_refs-sanitize-accepted-commands-declaration.patch mm-remove-compressed-copy-from-zram-in-memory-fix.patch memory_hotplug-use-pgdat_resize_lock-in-__offline_pages-fix.patch include-linux-mmh-add-page_aligned-helper.patch vmcore-allocate-buffer-for-elf-headers-on-page-size-alignment-fix.patch vmalloc-introduce-remap_vmalloc_range_partial-fix.patch vmcore-allocate-elf-note-segment-in-the-2nd-kernel-vmalloc-memory-fix.patch vmcore-allow-user-process-to-remap-elf-note-segment-buffer-fix.patch vmcore-support-mmap-on-proc-vmcore-fix.patch include-linux-mmzoneh-cleanups.patch include-linux-mmzoneh-cleanups-fix.patch drop_caches-add-some-documentation-and-info-messsge.patch memcg-debugging-facility-to-access-dangling-memcgs-fix.patch dump_stack-serialize-the-output-from-dump_stack-fix.patch panic-add-cpu-pid-to-warn_slowpath_common-in-warning-printks-fix.patch lib-bitmapc-speed-up-bitmap_find_free_region-fix.patch rbtree-remove-unneeded-include-fix.patch checkpatch-warn-when-using-gccs-binary-constant-extension.patch binfmt_elfc-use-get_random_int-to-fix-entropy-depleting.patch fat-additions-to-support-fat_fallocate-fix.patch idr-print-a-stack-dump-after-ida_remove-warning-fix.patch partitions-add-aix-lvm-partition-support-files-checkpatch-fixes.patch drivers-w1-slaves-w1_ds2408c-add-magic-sequence-to-disable-p0-test-mode-fix.patch lib-add-lz4-compressor-module-fix.patch crypto-add-lz4-cryptographic-api-fix.patch debugging-keep-track-of-page-owners-fix-2-fix.patch debugging-keep-track-of-page-owners-fix-2-fix-fix-fix.patch journal_add_journal_head-debug.patch kernel-forkc-export-kernel_thread-to-modules.patch mutex-subsystem-synchro-test-module.patch slab-leaks3-default-y.patch put_bh-debug.patch