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um: defer killing userspace on page table update failures

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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: 468f65976a ("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>
This commit is contained in:
Johannes Berg 2021-01-13 22:08:03 +01:00 committed by Richard Weinberger
parent 47da29763e
commit a7d48886ca
3 changed files with 8 additions and 4 deletions
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1
arch/um/include/shared/skas/mm_id.h
View File

@ -12,6 +12,7 @@ struct mm_id {
int pid;
} u;
unsigned long stack;
int kill;
};
#endif

7
arch/um/kernel/tlb.c
View File

@ -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;
}
}

4
arch/um/os-Linux/skas/process.c
View File

@ -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;
}