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Shutemov" , Sean Christopherson Cc: Chao Peng , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org, qemu-devel@nongnu.org, Paolo Bonzini , Jonathan Corbet , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Arnd Bergmann , Naoya Horiguchi , Miaohe Lin , x86@kernel.org, "H . Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Shuah Khan , Mike Rapoport , Steven Price , "Maciej S . Szmigiero" , Vlastimil Babka , Vishal Annapurve , Yu Zhang , "Kirill A . 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definitions=2023-01-25_10,2023-01-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 mlxlogscore=999 adultscore=0 mlxscore=0 suspectscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301250143 X-Proofpoint-GUID: w751XtEoQ50sDGPrHmiILrayNAx7g2ok X-Proofpoint-ORIG-GUID: w751XtEoQ50sDGPrHmiILrayNAx7g2ok Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/01/2023 12:53, Kirill A. Shutemov wrote: > On Wed, Jan 25, 2023 at 12:20:26AM +0000, Sean Christopherson wrote: >> On Tue, Jan 24, 2023, Liam Merwick wrote: >>> On 14/01/2023 00:37, Sean Christopherson wrote: >>>> On Fri, Dec 02, 2022, Chao Peng wrote: ... >>> >>> When running LTP (https://github.com/linux-test-project/ltp) on the v10 >>> bits (and also with Sean's branch above) I encounter the following NULL >>> pointer dereference with testcases/kernel/syscalls/madvise/madvise01 >>> (100% reproducible). >>> >>> It appears that in restrictedmem_error_page() inode->i_mapping->private_data >>> is NULL >>> in the list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) >>> but I don't know why. >> >> Kirill, can you take a look? Or pass the buck to someone who can? :-) > > The patch below should help. Thanks, this works for me. Regards, Liam > > diff --git a/mm/restrictedmem.c b/mm/restrictedmem.c > index 15c52301eeb9..39ada985c7c0 100644 > --- a/mm/restrictedmem.c > +++ b/mm/restrictedmem.c > @@ -307,14 +307,29 @@ void restrictedmem_error_page(struct page *page, struct address_space *mapping) > > spin_lock(&sb->s_inode_list_lock); > list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { > - struct restrictedmem *rm = inode->i_mapping->private_data; > struct restrictedmem_notifier *notifier; > - struct file *memfd = rm->memfd; > + struct restrictedmem *rm; > unsigned long index; > + struct file *memfd; > > - if (memfd->f_mapping != mapping) > + if (atomic_read(&inode->i_count)) > continue; > > + spin_lock(&inode->i_lock); > + if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { > + spin_unlock(&inode->i_lock); > + continue; > + } > + > + rm = inode->i_mapping->private_data; > + memfd = rm->memfd; > + > + if (memfd->f_mapping != mapping) { > + spin_unlock(&inode->i_lock); > + continue; > + } > + spin_unlock(&inode->i_lock); > + > xa_for_each_range(&rm->bindings, index, notifier, start, end) > notifier->ops->error(notifier, start, end); > break;