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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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3
arch/ia64/kernel/mca_drv.c
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@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kallsyms.h>
@ -176,7 +177,7 @@ mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
spin_unlock(&mca_bh_lock);
/* This process is about to be killed itself */
do_exit(SIGKILL);
make_task_dead(SIGKILL);
}
/**

2
arch/ia64/kernel/traps.c
View file

@ -85,7 +85,7 @@ die (const char *str, struct pt_regs *regs, long err)
if (panic_on_oops)
panic("Fatal exception");
do_exit(SIGSEGV);
make_task_dead(SIGSEGV);
return 0;
}

2
arch/ia64/mm/fault.c
View file

@ -272,7 +272,7 @@ retry:
regs = NULL;
bust_spinlocks(0);
if (regs)
do_exit(SIGKILL);
make_task_dead(SIGKILL);
return;
out_of_memory: