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nospec: Allow getting/setting on non-current task

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Adjust arch_prctl_get/set_spec_ctrl() to operate on tasks other than
current.

This is needed both for /proc/$pid/status queries and for seccomp (since
thread-syncing can trigger seccomp in non-current threads).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Kees Cook 2018-05-01 15:19:04 -07:00 • committed by Thomas Gleixner
parent a73ec77ee1
commit 7bbf1373e2
3 changed files with 26 additions and 17 deletions
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7
include/linux/nospec.h
View file

@ -7,6 +7,8 @@
#define _LINUX_NOSPEC_H
#include <asm/barrier.h>
struct task_struct;
/**
* array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise
* @index: array element index
@ -57,7 +59,8 @@ static inline unsigned long array_index_mask_nospec(unsigned long index,
})
/* Speculation control prctl */
int arch_prctl_spec_ctrl_get(unsigned long which);
int arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl);
int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which);
int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which,
unsigned long ctrl);
#endif /* _LINUX_NOSPEC_H */