CVE-2023-35827 patchset.
Yoshihiro Shimoda (2): ravb: Fix use-after-free issue in ravb_tx_timeout_work() ravb: Fix races between ravb_tx_timeout_work() and net related ops
drivers/net/ethernet/renesas/ravb_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
From: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com
mainline inclusion from mainline-v6.6-rc6 commit 3971442870713de527684398416970cf025b4f89 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7EDZ1 CVE: CVE-2023-35827
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The ravb_stop() should call cancel_work_sync(). Otherwise, ravb_tx_timeout_work() is possible to use the freed priv after ravb_remove() was called like below:
CPU0 CPU1 ravb_tx_timeout() ravb_remove() unregister_netdev() free_netdev(ndev) // free priv ravb_tx_timeout_work() // use priv
unregister_netdev() will call .ndo_stop() so that ravb_stop() is called. And, after phy_stop() is called, netif_carrier_off() is also called. So that .ndo_tx_timeout() will not be called after phy_stop().
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Reported-by: Zheng Wang zyytlz.wz@163.com Closes: https://lore.kernel.org/netdev/20230725030026.1664873-1-zyytlz.wz@163.com/ Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Reviewed-by: Sergey Shtylyov s.shtylyov@omp.ru Link: https://lore.kernel.org/r/20231005011201.14368-3-yoshihiro.shimoda.uh@renesa... Signed-off-by: Jakub Kicinski kuba@kernel.org Conflicts: drivers/net/ethernet/renesas/ravb_main.c Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com --- drivers/net/ethernet/renesas/ravb_main.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index faaf74073a12..cf54865c609c 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1683,6 +1683,8 @@ static int ravb_close(struct net_device *ndev) of_phy_deregister_fixed_link(np); }
+ cancel_work_sync(&priv->work); + if (priv->chip_id != RCAR_GEN2) { free_irq(priv->tx_irqs[RAVB_NC], ndev); free_irq(priv->rx_irqs[RAVB_NC], ndev);
From: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com
stable inclusion from stable-v4.19.301 commit b655af79a24379ae1107795e69c80e157c420be3 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7EDZ1 CVE: CVE-2023-35827
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 9870257a0a338cd8d6c1cddab74e703f490f6779 ]
Fix races between ravb_tx_timeout_work() and functions of net_device_ops and ethtool_ops by using rtnl_trylock() and rtnl_unlock(). Note that since ravb_close() is under the rtnl lock and calls cancel_work_sync(), ravb_tx_timeout_work() should calls rtnl_trylock(). Otherwise, a deadlock may happen in ravb_tx_timeout_work() like below:
CPU0 CPU1 ravb_tx_timeout() schedule_work() ... __dev_close_many() // Under rtnl lock ravb_close() cancel_work_sync() // Waiting ravb_tx_timeout_work() rtnl_lock() // This is possible to cause a deadlock
If rtnl_trylock() fails, rescheduling the work with sleep for 1 msec.
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Reviewed-by: Sergey Shtylyov s.shtylyov@omp.ru Link: https://lore.kernel.org/r/20231127122420.3706751-1-yoshihiro.shimoda.uh@rene... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Conflicts: drivers/net/ethernet/renesas/ravb_main.c Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com --- drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index cf54865c609c..bf5e95ecec3e 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1446,6 +1446,12 @@ static void ravb_tx_timeout_work(struct work_struct *work) work); struct net_device *ndev = priv->ndev;
+ if (!rtnl_trylock()) { + usleep_range(1000, 2000); + schedule_work(&priv->work); + return; + } + netif_tx_stop_all_queues(ndev);
/* Stop PTP Clock driver */ @@ -1467,6 +1473,8 @@ static void ravb_tx_timeout_work(struct work_struct *work) ravb_ptp_init(ndev, priv->pdev);
netif_tx_start_all_queues(ndev); + + rtnl_unlock(); }
/* Packet transmit function for Ethernet AVB */
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