Commit 5180e3e2 authored Mar 22, 2016 by Andy Lutomirski Committed by Linus Torvalds Mar 22, 2016

compat: add in_compat_syscall to ask whether we're in a compat syscall

A lot of code currently abuses is_compat_task to determine this.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: David Airlie <airlied@linux.ie>
Cc: David Herrmann <dh.herrmann@googlemail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Oded Gabbay <oded.gabbay@gmail.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b4aa14a6

include/linux/compat.h

+15 −0

Original line number	Diff line number	Diff line
		@@ -5,6 +5,8 @@
		* syscall compatibility layer.
		*/

		#include <linux/types.h>

		#ifdef CONFIG_COMPAT

		#include <linux/stat.h>
		@@ -719,9 +721,22 @@ asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,

		asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
		int, const char __user *);

		/*
		* For most but not all architectures, "am I in a compat syscall?" and
		* "am I a compat task?" are the same question. For architectures on which
		* they aren't the same question, arch code can override in_compat_syscall.
		*/

		#ifndef in_compat_syscall
		static inline bool in_compat_syscall(void) { return is_compat_task(); }
		#endif

		#else

		#define is_compat_task() (0)
		static inline bool in_compat_syscall(void) { return false; }

		#endif /* CONFIG_COMPAT */

		#endif /* _LINUX_COMPAT_H */

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