linux-kernel - [PATCH 09/29] mm: add do_handle_mm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210430195232.30491-10-michel@lespinasse.org>
Date:   Fri, 30 Apr 2021 12:52:10 -0700
From:   Michel Lespinasse <michel@...pinasse.org>
To:     Linux-MM <linux-mm@...ck.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Cc:     Laurent Dufour <ldufour@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        Paul McKenney <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Michel Lespinasse <michel@...pinasse.org>
Subject: [PATCH 09/29] mm: add do_handle_mm_fault()

Add a new do_handle_mm_fault function, which extends the existing
handle_mm_fault() API by adding an mmap sequence count, to be used
in the FAULT_FLAG_SPECULATIVE case.

In the initial implementation, FAULT_FLAG_SPECULATIVE always fails
(by returning VM_FAULT_RETRY).

The existing handle_mm_fault() API is kept as a wrapper around
do_handle_mm_fault() so that we do not have to immediately update
every handle_mm_fault() call site.

Signed-off-by: Michel Lespinasse <michel@...pinasse.org>
---
 include/linux/mm.h | 12 +++++++++---
 mm/memory.c        | 10 +++++++---
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 021fdab5b721..d5988e78e6ab 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1724,9 +1724,15 @@ int generic_error_remove_page(struct address_space *mapping, struct page *page);
 int invalidate_inode_page(struct page *page);
 
 #ifdef CONFIG_MMU
-extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma,
-				  unsigned long address, unsigned int flags,
-				  struct pt_regs *regs);
+extern vm_fault_t do_handle_mm_fault(struct vm_area_struct *vma,
+		unsigned long address, unsigned int flags,
+		unsigned long seq, struct pt_regs *regs);
+static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma,
+		unsigned long address, unsigned int flags,
+		struct pt_regs *regs)
+{
+	return do_handle_mm_fault(vma, address, flags, 0, regs);
+}
 extern int fixup_user_fault(struct mm_struct *mm,
 			    unsigned long address, unsigned int fault_flags,
 			    bool *unlocked);
diff --git a/mm/memory.c b/mm/memory.c
index 217c31c616f4..8258ff93a055 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4509,11 +4509,15 @@ static inline void mm_account_fault(struct pt_regs *regs,
  * The mmap_lock may have been released depending on flags and our
  * return value.  See filemap_fault() and __lock_page_or_retry().
  */
-vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
-			   unsigned int flags, struct pt_regs *regs)
+vm_fault_t do_handle_mm_fault(struct vm_area_struct *vma,
+		unsigned long address, unsigned int flags,
+		unsigned long seq, struct pt_regs *regs)
 {
 	vm_fault_t ret;
 
+	if (flags & FAULT_FLAG_SPECULATIVE)
+		return VM_FAULT_RETRY;
+
 	__set_current_state(TASK_RUNNING);
 
 	count_vm_event(PGFAULT);
@@ -4555,7 +4559,7 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(handle_mm_fault);
+EXPORT_SYMBOL_GPL(do_handle_mm_fault);
 
 #ifndef __PAGETABLE_P4D_FOLDED
 /*
-- 
2.20.1