From: Josef Bacik josef@toxicpanda.com

stable inclusion from stable-v5.10.167 commit 4595d90b5d2ea5fa4d318d13f59055aa4bf3e7f5 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L5GC CVE: CVE-2024-26958

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l...

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[ Upstream commit 17f46b803d4f23c66cacce81db35fef3adb8f2af ]

In production we have been hitting the following warning consistently

------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 17 PID: 1800359 at lib/refcount.c:28 refcount_warn_saturate+0x9c/0xe0 Workqueue: nfsiod nfs_direct_write_schedule_work [nfs] RIP: 0010:refcount_warn_saturate+0x9c/0xe0 PKRU: 55555554 Call Trace: <TASK> ? __warn+0x9f/0x130 ? refcount_warn_saturate+0x9c/0xe0 ? report_bug+0xcc/0x150 ? handle_bug+0x3d/0x70 ? exc_invalid_op+0x16/0x40 ? asm_exc_invalid_op+0x16/0x20 ? refcount_warn_saturate+0x9c/0xe0 nfs_direct_write_schedule_work+0x237/0x250 [nfs] process_one_work+0x12f/0x4a0 worker_thread+0x14e/0x3b0 ? ZSTD_getCParams_internal+0x220/0x220 kthread+0xdc/0x120 ? __btf_name_valid+0xa0/0xa0 ret_from_fork+0x1f/0x30

This is because we're completing the nfs_direct_request twice in a row.

The source of this is when we have our commit requests to submit, we process them and send them off, and then in the completion path for the commit requests we have

if (nfs_commit_end(cinfo.mds)) nfs_direct_write_complete(dreq);

However since we're submitting asynchronous requests we sometimes have one that completes before we submit the next one, so we end up calling complete on the nfs_direct_request twice.

The only other place we use nfs_generic_commit_list() is in __nfs_commit_inode, which wraps this call in a

nfs_commit_begin(); nfs_commit_end();

Which is a common pattern for this style of completion handling, one that is also repeated in the direct code with get_dreq()/put_dreq() calls around where we process events as well as in the completion paths.

Fix this by using the same pattern for the commit requests.

Before with my 200 node rocksdb stress running this warning would pop every 10ish minutes. With my patch the stress test has been running for several hours without popping.

Signed-off-by: Josef Bacik josef@toxicpanda.com Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Sasha Levin sashal@kernel.org Conflicts: fs/nfs/write.c include/linux/nfs_fs.h [make nfs_commit_end() have return value of bool and declared in header file] Signed-off-by: Long Li leo.lilong@huawei.com --- fs/nfs/direct.c | 11 +++++++++-- fs/nfs/write.c | 10 +++++++--- include/linux/nfs_fs.h | 2 ++ 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 6a4083d550c6..c0de56ed8364 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -760,10 +760,17 @@ static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq) LIST_HEAD(mds_list);

nfs_init_cinfo_from_dreq(&cinfo, dreq); + nfs_commit_begin(cinfo.mds); nfs_scan_commit(dreq->inode, &mds_list, &cinfo); res = nfs_generic_commit_list(dreq->inode, &mds_list, 0, &cinfo); - if (res < 0) /* res == -ENOMEM */ - nfs_direct_write_reschedule(dreq); + if (res < 0) { /* res == -ENOMEM */ + spin_lock(&dreq->lock); + if (dreq->flags == 0) + dreq->flags = NFS_ODIRECT_RESCHED_WRITES; + spin_unlock(&dreq->lock); + } + if (nfs_commit_end(cinfo.mds)) + nfs_direct_write_complete(dreq); }

static void nfs_direct_write_schedule_work(struct work_struct *work) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index e383d265e65b..e4b1ce488637 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1643,15 +1643,19 @@ static int wait_on_commit(struct nfs_mds_commit_info *cinfo) !atomic_read(&cinfo->rpcs_out)); }

-static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) +void nfs_commit_begin(struct nfs_mds_commit_info *cinfo) { atomic_inc(&cinfo->rpcs_out); }

-static void nfs_commit_end(struct nfs_mds_commit_info *cinfo) +bool nfs_commit_end(struct nfs_mds_commit_info *cinfo) { - if (atomic_dec_and_test(&cinfo->rpcs_out)) + + if (atomic_dec_and_test(&cinfo->rpcs_out)) { wake_up_var(&cinfo->rpcs_out); + return true; + } + return false; }

void nfs_commitdata_release(struct nfs_commit_data *data) diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 22e4ce63917d..beb26241fe57 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -545,6 +545,8 @@ extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); extern int nfs_commit_inode(struct inode *, int); extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail); extern void nfs_commit_free(struct nfs_commit_data *data); +void nfs_commit_begin(struct nfs_mds_commit_info *cinfo); +bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);

static inline int nfs_have_writebacks(struct inode *inode)