The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a7d48886cacf8b426e0079bca9639d2657cf2d38 Mon Sep 17 00:00:00 2001

From: Johannes Berg johannes.berg@intel.com Date: Wed, 13 Jan 2021 22:08:03 +0100 Subject: [PATCH] um: defer killing userspace on page table update failures

In some cases we can get to fix_range_common() with mmap_sem held, and in others we get there without it being held. For example, we get there with it held from sys_mprotect(), and without it held from fork_handler().

Avoid any issues in this and simply defer killing the task until it runs the next time. Do it on the mm so that another task that shares the same mm can't continue running afterwards.

Cc: stable@vger.kernel.org Fixes: 468f65976a8d ("um: Fix hung task in fix_range_common()") Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Richard Weinberger richard@nod.at

diff --git a/arch/um/include/shared/skas/mm_id.h b/arch/um/include/shared/skas/mm_id.h index 4337b4ced095..e82e203f5f41 100644 --- a/arch/um/include/shared/skas/mm_id.h +++ b/arch/um/include/shared/skas/mm_id.h @@ -12,6 +12,7 @@ struct mm_id { int pid; } u; unsigned long stack; + int kill; };

#endif diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 89468da6bf88..5be1b0da9f3b 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -352,12 +352,11 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,

/* This is not an else because ret is modified above */ if (ret) { + struct mm_id *mm_idp = &current->mm->context.id; + printk(KERN_ERR "fix_range_common: failed, killing current " "process: %d\n", task_tgid_vnr(current)); - /* We are under mmap_lock, release it such that current can terminate */ - mmap_write_unlock(current->mm); - force_sig(SIGKILL); - do_signal(&current->thread.regs); + mm_idp->kill = 1; } }

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index ed4bbffe8d7a..d910e25c273e 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -300,6 +300,7 @@ static int userspace_tramp(void *stack) }

int userspace_pid[NR_CPUS]; +int kill_userspace_mm[NR_CPUS];

/** * start_userspace() - prepare a new userspace process @@ -393,6 +394,8 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs) interrupt_end();

while (1) { + if (kill_userspace_mm[0]) + fatal_sigsegv();

/* * This can legitimately fail if the process loads a @@ -714,4 +717,5 @@ void reboot_skas(void) void __switch_mm(struct mm_id *mm_idp) { userspace_pid[0] = mm_idp->u.pid; + kill_userspace_mm[0] = mm_idp->kill; }