From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4BE4DC43219 for ; Thu, 29 Sep 2022 22:34:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229571AbiI2WeO (ORCPT ); Thu, 29 Sep 2022 18:34:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230122AbiI2WdO (ORCPT ); Thu, 29 Sep 2022 18:33:14 -0400 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B2E8155668; Thu, 29 Sep 2022 15:31:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664490668; x=1696026668; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=4GU+7bD3PIJhe/EOuq1oD0vsUP4qa2yf2XDdcT/yQi0=; b=j01uvTFWiS1LvIY3Q4Lm8eE2V94iniCZ1f0tvdBi4tlbZh5YRXvs4MFm kuRzwy2JenxTBUQLUJ40hKAOYg8L/x6uAI+uh6mJPlESABINJ6FwRskFE u2y6yCHqPCbmPeM2zFlRzPdQd8+DaFCYfEMJvW2ldWGvdinA+gHuEYYmG ULSABs532Akcua8FKbyNE55UQsoVFtFDww8ypcTTTNZdAG+cV7cVWsUoy sr5cFZedJ15bjJfQ6rzxeEWru+o2yUUZ+hwZdSILmw9C8apE9dJyPgJfn FSn8PjuFQSi/C8Ko7jLEBocOwvlctbwVTialMQ/2bZvlWH8bg8io3Hk7V g==; X-IronPort-AV: E=McAfee;i="6500,9779,10485"; a="285182002" X-IronPort-AV: E=Sophos;i="5.93,356,1654585200"; d="scan'208";a="285182002" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2022 15:30:30 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10485"; a="691016278" X-IronPort-AV: E=Sophos;i="5.93,356,1654585200"; d="scan'208";a="691016278" Received: from sergungo-mobl.amr.corp.intel.com (HELO rpedgeco-desk.amr.corp.intel.com) ([10.251.25.88]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2022 15:30:26 -0700 From: Rick Edgecombe To: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , joao.moreira@intel.com, John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu , Andrew Morton Subject: [PATCH v2 21/39] mm: Re-introduce vm_flags to do_mmap() Date: Thu, 29 Sep 2022 15:29:18 -0700 Message-Id: <20220929222936.14584-22-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220929222936.14584-1-rick.p.edgecombe@intel.com> References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org From: Yu-cheng Yu There was no more caller passing vm_flags to do_mmap(), and vm_flags was removed from the function's input by: commit 45e55300f114 ("mm: remove unnecessary wrapper function do_mmap_pgoff()"). There is a new user now. Shadow stack allocation passes VM_SHADOW_STACK to do_mmap(). Thus, re-introduce vm_flags to do_mmap(). Signed-off-by: Yu-cheng Yu Reviewed-by: Peter Collingbourne Reviewed-by: Kees Cook Reviewed-by: Kirill A. Shutemov Signed-off-by: Rick Edgecombe Cc: Andrew Morton Cc: Oleg Nesterov Cc: linux-mm@kvack.org --- fs/aio.c | 2 +- include/linux/mm.h | 3 ++- ipc/shm.c | 2 +- mm/mmap.c | 10 +++++----- mm/nommu.c | 4 ++-- mm/util.c | 2 +- 6 files changed, 12 insertions(+), 11 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index 606613e9d1f4..a54b5ee72f1c 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -554,7 +554,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events) ctx->mmap_base = do_mmap(ctx->aio_ring_file, 0, ctx->mmap_size, PROT_READ | PROT_WRITE, - MAP_SHARED, 0, &unused, NULL); + MAP_SHARED, 0, 0, &unused, NULL); mmap_write_unlock(mm); if (IS_ERR((void *)ctx->mmap_base)) { ctx->mmap_size = 0; diff --git a/include/linux/mm.h b/include/linux/mm.h index 09458e77bf52..6aa0ffe3666c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2667,7 +2667,8 @@ extern unsigned long mmap_region(struct file *file, unsigned long addr, struct list_head *uf); extern unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, - unsigned long pgoff, unsigned long *populate, struct list_head *uf); + vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, + struct list_head *uf); extern int __do_munmap(struct mm_struct *, unsigned long, size_t, struct list_head *uf, bool downgrade); extern int do_munmap(struct mm_struct *, unsigned long, size_t, diff --git a/ipc/shm.c b/ipc/shm.c index b3048ebd5c31..f236b3e14ec4 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1646,7 +1646,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, goto invalid; } - addr = do_mmap(file, addr, size, prot, flags, 0, &populate, NULL); + addr = do_mmap(file, addr, size, prot, flags, 0, 0, &populate, NULL); *raddr = addr; err = 0; if (IS_ERR_VALUE(addr)) diff --git a/mm/mmap.c b/mm/mmap.c index 8569ef09614c..e1006c41b1cc 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1375,11 +1375,11 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode, */ unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, - unsigned long flags, unsigned long pgoff, - unsigned long *populate, struct list_head *uf) + unsigned long flags, vm_flags_t vm_flags, + unsigned long pgoff, unsigned long *populate, + struct list_head *uf) { struct mm_struct *mm = current->mm; - vm_flags_t vm_flags; int pkey = 0; *populate = 0; @@ -1439,7 +1439,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, * to. we assume access permissions have been handled by the open * of the memory object, so we don't do any here. */ - vm_flags = calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) | + vm_flags |= calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) | mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; if (flags & MAP_LOCKED) @@ -2964,7 +2964,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, file = get_file(vma->vm_file); ret = do_mmap(vma->vm_file, start, size, - prot, flags, pgoff, &populate, NULL); + prot, flags, 0, pgoff, &populate, NULL); fput(file); out: mmap_write_unlock(mm); diff --git a/mm/nommu.c b/mm/nommu.c index e819cbc21b39..85b41107a192 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1059,6 +1059,7 @@ unsigned long do_mmap(struct file *file, unsigned long len, unsigned long prot, unsigned long flags, + vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf) @@ -1066,7 +1067,6 @@ unsigned long do_mmap(struct file *file, struct vm_area_struct *vma; struct vm_region *region; struct rb_node *rb; - vm_flags_t vm_flags; unsigned long capabilities, result; int ret; @@ -1085,7 +1085,7 @@ unsigned long do_mmap(struct file *file, /* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ - vm_flags = determine_vm_flags(file, prot, flags, capabilities); + vm_flags |= determine_vm_flags(file, prot, flags, capabilities); /* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); diff --git a/mm/util.c b/mm/util.c index c9439c66d8cf..f15929f2c5bd 100644 --- a/mm/util.c +++ b/mm/util.c @@ -549,7 +549,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr, if (!ret) { if (mmap_write_lock_killable(mm)) return -EINTR; - ret = do_mmap(file, addr, len, prot, flag, pgoff, &populate, + ret = do_mmap(file, addr, len, prot, flag, 0, pgoff, &populate, &uf); mmap_write_unlock(mm); userfaultfd_unmap_complete(mm, &uf); -- 2.17.1