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exit: Add and use make_task_dead.

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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" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2021-06-28 14:52:01 -05:00
parent 5e354747b2
commit 0e25498f8c
39 changed files with 63 additions and 56 deletions
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3
tools/objtool/check.c
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@ -168,6 +168,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"panic",
"do_exit",
"do_task_dead",
"make_task_dead",
"__module_put_and_exit",
"complete_and_exit",
"__reiserfs_panic",
@ -175,7 +176,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"fortify_panic",
"usercopy_abort",
"machine_real_restart",
"rewind_stack_do_exit",
"rewind_stack_and_make_dead"
"kunit_try_catch_throw",
"xen_start_kernel",
"cpu_bringup_and_idle",