[PATCH v2 2/3] Documentation: SECCOMP_RET_INFO return value

[Corey Bryant <coreyb@linux.vnet.ibm.com>]

Adds documentation describing the SECCOMP_RET_INFO return value.

Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com>
---
v2:
 - Add arch to message (wad@chromium.org)

 Documentation/prctl/seccomp_filter.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/prctl/seccomp_filter.txt b/Documentation/prctl/seccomp_filter.txt
index 1e469ef..88d6882 100644
--- a/Documentation/prctl/seccomp_filter.txt
+++ b/Documentation/prctl/seccomp_filter.txt
@@ -49,6 +49,7 @@ CONFIG_HAVE_ARCH_SECCOMP_FILTER, then filters may be added as below:
 PR_SET_SECCOMP:
 	Now takes an additional argument which specifies a new filter
 	using a BPF program.
+
 	The BPF program will be executed over struct seccomp_data
 	reflecting the system call number, arguments, and other
 	metadata.  The BPF program must then return one of the
@@ -138,6 +139,13 @@ SECCOMP_RET_TRACE:
 	allow use of ptrace, even of other sandboxed processes, without
 	extreme care; ptracers can use this mechanism to escape.)
 
+SECCOMP_RET_INFO:
+	Results in a rate-limited informational kernel message that
+	includes the system call number and architecture, and the
+	system call is executed.  The message format is:
+	"seccomp: syscall=x, arch=y", where x is the system call number
+	and y is the architecture.
+
 SECCOMP_RET_ALLOW:
 	Results in the system call being executed.
 
-- 
1.7.11.7