The patch titled
Subject: compat: add in_compat_syscall to ask whether we're in a compat syscall
has been added to the -mm tree. Its filename is
compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall.patch
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------------------------------------------------------
From: Andy Lutomirski <luto@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Clemens Ladisch <clemens@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: David Herrmann <dh.herrmann@xxxxxxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Jiri Kosina <jikos@xxxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Cc: Neil Horman <nhorman@xxxxxxxxxxxxx>
Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Cc: Oleg Drokin <oleg.drokin@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vlad Yasevich <vyasevich@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compat.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN include/linux/compat.h~compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall include/linux/compat.h
--- a/include/linux/compat.h~compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall
+++ a/include/linux/compat.h
@@ -5,6 +5,8 @@
* syscall compatibility layer.
*/
+#include <linux/types.h>
+
#ifdef CONFIG_COMPAT
#include <linux/stat.h>
@@ -713,9 +715,22 @@ asmlinkage long compat_sys_sched_rr_get_
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 */
_
Patches currently in -mm which might be from luto@xxxxxxxxxx are
compat-add-in_compat_syscall-to-ask-whether-were-in-a-compat-syscall.patch
sparc-compat-provide-an-accurate-in_compat_syscall-implementation.patch
sparc-syscall-fix-syscall_get_arch.patch
seccomp-check-in_compat_syscall-not-is_compat_task-in-strict-mode.patch
ptrace-in-peek_siginfo-check-syscall-bitness-not-task-bitness.patch
auditsc-for-seccomp-events-log-syscall-compat-state-using-in_compat_syscall.patch
staging-lustre-switch-from-is_compat_task-to-in_compat_syscall.patch
ext4-in-ext4_dir_llseek-check-syscall-bitness-directly.patch
net-sctp-use-in_compat_syscall-for-sctp_getsockopt_connectx3.patch
net-xfrm_user-use-in_compat_syscall-to-deny-compat-syscalls.patch
firewire-use-in_compat_syscall-to-check-ioctl-compatness.patch
efivars-use-in_compat_syscall-to-check-for-compat-callers.patch
amdkfd-use-in_compat_syscall-to-check-open-caller-type.patch
input-redefine-input_compat_test-as-in_compat_syscall.patch
uhid-check-write-bitness-using-in_compat_syscall.patch
x86-compat-remove-is_compat_task.patch
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