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authorAndrea Arcangeli <andrea@cpushare.com>2007-07-15 23:41:32 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:50 -0700
commit1d9d02feeee89e9132034d504c9a45eeaf618a3d (patch)
treea4324cce8acd77cace3b1d4cf3a1e61783707e5c /kernel/seccomp.c
parentbe0ef957c9eed4ebae873ee3fbcfb9dfde486dec (diff)
downloadlwn-1d9d02feeee89e9132034d504c9a45eeaf618a3d.tar.gz
lwn-1d9d02feeee89e9132034d504c9a45eeaf618a3d.zip
move seccomp from /proc to a prctl
This reduces the memory footprint and it enforces that only the current task can enable seccomp on itself (this is a requirement for a strightforward [modulo preempt ;) ] TIF_NOTSC implementation). Signed-off-by: Andrea Arcangeli <andrea@cpushare.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/seccomp.c')
-rw-r--r--kernel/seccomp.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index c3391b6020e8..1dfa8a509726 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -10,6 +10,7 @@
#include <linux/sched.h>
/* #define SECCOMP_DEBUG 1 */
+#define NR_SECCOMP_MODES 1
/*
* Secure computing mode 1 allows only read/write/exit/sigreturn.
@@ -54,3 +55,28 @@ void __secure_computing(int this_syscall)
#endif
do_exit(SIGKILL);
}
+
+long prctl_get_seccomp(void)
+{
+ return current->seccomp.mode;
+}
+
+long prctl_set_seccomp(unsigned long seccomp_mode)
+{
+ long ret;
+
+ /* can set it only once to be even more secure */
+ ret = -EPERM;
+ if (unlikely(current->seccomp.mode))
+ goto out;
+
+ ret = -EINVAL;
+ if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
+ current->seccomp.mode = seccomp_mode;
+ set_thread_flag(TIF_SECCOMP);
+ ret = 0;
+ }
+
+ out:
+ return ret;
+}