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exit: Add and use make_task_dead.

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commit 0e25498f8cd43c1b5aa327f373dd094e9a006da7 upstream.

There are two big uses of do_exit.  The first is it's design use to be
the guts of the exit(2) system call.  The second use is to terminate
a task after something catastrophic has happened like a NULL pointer
in kernel code.

Add a function make_task_dead that is initialy exactly the same as
do_exit to cover the cases where do_exit is called to handle
catastrophic failure.  In time this can probably be reduced to just a
light wrapper around do_task_dead. For now keep it exactly the same so
that there will be no behavioral differences introducing this new
concept.

Replace all of the uses of do_exit that use it for catastraphic
task cleanup with make_task_dead to make it clear what the code
is doing.

As part of this rename rewind_stack_do_exit
rewind_stack_and_make_dead.

Signed-off-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Eric W. Biederman 2023-02-01 20:42:42 -08:00 • committed by Greg Kroah-Hartman
commit 9a18c9c833
38 changed files with 60 additions and 52 deletions
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4
arch/microblaze/kernel/exceptions.c
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@ -44,10 +44,10 @@ void die(const char *str, struct pt_regs *fp, long err)
pr_warn("Oops: %s, sig: %ld\n", str, err);
show_regs(fp);
spin_unlock_irq(&die_lock);
/* do_exit() should take care of panic'ing from an interrupt
/* make_task_dead() should take care of panic'ing from an interrupt
* context so we don't handle it here
*/
do_exit(err);
make_task_dead(err);
}
/* for user application debugging */