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Message-Id: <1330559620-23543-4-git-send-email-wad@chromium.org>
Date: Wed, 29 Feb 2012 17:53:31 -0600
From: Will Drewry <wad@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: linux-arch@...r.kernel.org,
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Will Drewry <wad@...omium.org>
Subject: [PATCH v12 04/13] asm/syscall.h: add syscall_get_arch
Adds a stub for a function that will return the AUDIT_ARCH_*
value appropriate to the supplied task based on the system
call convention.
For audit's use, the value can generally be hard-coded at the
audit-site. However, for other functionality not inlined into
syscall entry/exit, this makes that information available.
seccomp_filter is the first planned consumer and, as such,
the comment indicates a tie to HAVE_ARCH_SECCOMP_FILTER. That
is probably an unneeded detail.
Suggested-by: Roland McGrath <mcgrathr@...omium.org>
Signed-off-by: Will Drewry <wad@...omium.org>
v11: fixed improper return type
v10: introduced
---
include/asm-generic/syscall.h | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h
index 5c122ae..a2c13dc 100644
--- a/include/asm-generic/syscall.h
+++ b/include/asm-generic/syscall.h
@@ -142,4 +142,18 @@ void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
unsigned int i, unsigned int n,
const unsigned long *args);
+/**
+ * syscall_get_arch - return the AUDIT_ARCH for the current system call
+ * @task: task of interest, must be in system call entry tracing
+ * @regs: task_pt_regs() of @task
+ *
+ * Returns the AUDIT_ARCH_* based on the system call convention in use.
+ *
+ * It's only valid to call this when @task is stopped on entry to a system
+ * call, due to %TIF_SYSCALL_TRACE, %TIF_SYSCALL_AUDIT, or %TIF_SECCOMP.
+ *
+ * Note, at present this function is only required with
+ * CONFIG_HAVE_ARCH_SECCOMP_FILTER.
+ */
+int syscall_get_arch(struct task_struct *task, struct pt_regs *regs);
#endif /* _ASM_SYSCALL_H */
--
1.7.5.4
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