From: "Eric W. Biederman" ebiederm@xmission.com
stable inclusion from linux-4.19.99 commit 6db0e28b893aa28af3f7c0197749a5d9cbfded5c bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27 ---------------------------
[ Upstream commit 33da8e7c814f77310250bb54a9db36a44c5de784 ]
My recent to change to only use force_sig for a synchronous events wound up breaking signal reception cifs and drbd. I had overlooked the fact that by default kthreads start out with all signals set to SIG_IGN. So a change I thought was safe turned out to have made it impossible for those kernel thread to catch their signals.
Reverting the work on force_sig is a bad idea because what the code was doing was very much a misuse of force_sig. As the way force_sig ultimately allowed the signal to happen was to change the signal handler to SIG_DFL. Which after the first signal will allow userspace to send signals to these kernel threads. At least for wake_ack_receiver in drbd that does not appear actively wrong.
So correct this problem by adding allow_kernel_signal that will allow signals whose siginfo reports they were sent by the kernel through, but will not allow userspace generated signals, and update cifs and drbd to call allow_kernel_signal in an appropriate place so that their thread can receive this signal.
Fixing things this way ensures that userspace won't be able to send signals and cause problems, that it is clear which signals the threads are expecting to receive, and it guarantees that nothing else in the system will be affected.
This change was partly inspired by similar cifs and drbd patches that added allow_signal.
Reported-by: ronnie sahlberg ronniesahlberg@gmail.com Reported-by: Christoph Böhmwalder christoph.boehmwalder@linbit.com Tested-by: Christoph Böhmwalder christoph.boehmwalder@linbit.com Cc: Steve French smfrench@gmail.com Cc: Philipp Reisner philipp.reisner@linbit.com Cc: David Laight David.Laight@ACULAB.COM Fixes: 247bc9470b1e ("cifs: fix rmmod regression in cifs.ko caused by force_sig changes") Fixes: 72abe3bcf091 ("signal/cifs: Fix cifs_put_tcp_session to call send_sig instead of force_sig") Fixes: fee109901f39 ("signal/drbd: Use send_sig not force_sig") Fixes: 3cf5d076fb4d ("signal: Remove task parameter from force_sig") Signed-off-by: "Eric W. Biederman" ebiederm@xmission.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com [io_uring need allow_kernel_signal] Signed-off-by: yangerkun yangerkun@huawei.com Reviewed-by: zhangyi (F) yi.zhang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- drivers/block/drbd/drbd_main.c | 2 ++ fs/cifs/connect.c | 2 +- include/linux/signal.h | 15 ++++++++++++++- kernel/signal.c | 5 +++++ 4 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index a49a8d91a599..5e3885f5729b 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -334,6 +334,8 @@ static int drbd_thread_setup(void *arg) thi->name[0], resource->name);
+ allow_kernel_signal(DRBD_SIGKILL); + allow_kernel_signal(SIGXCPU); restart: retval = thi->function(thi);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index ef7e71b904df..907be252c5d4 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -974,7 +974,7 @@ cifs_demultiplex_thread(void *p) mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
set_freezable(); - allow_signal(SIGKILL); + allow_kernel_signal(SIGKILL); while (server->tcpStatus != CifsExiting) { if (try_to_freeze()) continue; diff --git a/include/linux/signal.h b/include/linux/signal.h index e4d01469ed60..0be5ce2375cb 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -272,6 +272,9 @@ extern void signal_setup_done(int failed, struct ksignal *ksig, int stepping); extern void exit_signals(struct task_struct *tsk); extern void kernel_sigaction(int, __sighandler_t);
+#define SIG_KTHREAD ((__force __sighandler_t)2) +#define SIG_KTHREAD_KERNEL ((__force __sighandler_t)3) + static inline void allow_signal(int sig) { /* @@ -279,7 +282,17 @@ static inline void allow_signal(int sig) * know it'll be handled, so that they don't get converted to * SIGKILL or just silently dropped. */ - kernel_sigaction(sig, (__force __sighandler_t)2); + kernel_sigaction(sig, SIG_KTHREAD); +} + +static inline void allow_kernel_signal(int sig) +{ + /* + * Kernel threads handle their own signals. Let the signal code + * know signals sent by the kernel will be handled, so that they + * don't get silently dropped. + */ + kernel_sigaction(sig, SIG_KTHREAD_KERNEL); }
static inline void disallow_signal(int sig) diff --git a/kernel/signal.c b/kernel/signal.c index deba77ef0573..5ded8c6ac789 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -88,6 +88,11 @@ static bool sig_task_ignored(struct task_struct *t, int sig, bool force) handler == SIG_DFL && !(force && sig_kernel_only(sig))) return true;
+ /* Only allow kernel generated signals to this kthread */ + if (unlikely((t->flags & PF_KTHREAD) && + (handler == SIG_KTHREAD_KERNEL) && !force)) + return true; + return sig_handler_ignored(handler, sig); }