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kernel: add K_INHERIT_PERMS flag

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By default, threads are created only having access to their own thread
object and nothing else. This new flag to k_thread_create() gives the
thread access to all objects that the parent had at the time it was
created, with the exception of the parent thread itself.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-10-05 11:11:02 -07:00 • committed by Andrew Boie
commit 47f8fd1d4d
6 changed files with 75 additions and 2 deletions
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5
include/linker/kobject-text.ld
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@ -2,14 +2,14 @@
#if defined(CONFIG_DEBUG) || defined(CONFIG_STACK_CANARIES)
#define KOBJECT_TEXT_AREA 256
#else
#define KOBJECT_TEXT_AREA 78
#define KOBJECT_TEXT_AREA 118
#endif
#endif
#ifdef CONFIG_USERSPACE
/* We need to reserve room for the gperf generated hash functions.
* Fortunately, unlike the data tables, the size of the code is
* reasonably predictable; on x86 usually about 44 bytes with -Os.
* reasonably predictable.
*
* The linker will error out complaining that the location pointer
* is moving backwards if the reserved room isn't large enough.
@ -19,6 +19,7 @@
_kobject_text_area_end = .;
#ifndef LINKER_PASS2
PROVIDE(_k_object_find = .);
PROVIDE(_k_object_wordlist_foreach = .);
#endif
. += KOBJECT_TEXT_AREA - (_kobject_text_area_end - _kobject_text_area_start);
#endif /* CONFIG_USERSPACE */