3.16.58-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit 1f41b450416e689b9b7c8bfb750a98604f687a9b upstream.
To support splitting mode 1 from mode 2, extract the mode checking and
assignment logic into common functions.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Reviewed-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
kernel/seccomp.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -194,7 +194,23 @@ static u32 seccomp_run_filters(int sysca
}
return ret;
}
+#endif /* CONFIG_SECCOMP_FILTER */
+static inline bool seccomp_may_assign_mode(unsigned long seccomp_mode)
+{
+ if (current->seccomp.mode && current->seccomp.mode != seccomp_mode)
+ return false;
+
+ return true;
+}
+
+static inline void seccomp_assign_mode(unsigned long seccomp_mode)
+{
+ current->seccomp.mode = seccomp_mode;
+ set_tsk_thread_flag(current, TIF_SECCOMP);
+}
+
+#ifdef CONFIG_SECCOMP_FILTER
/**
* seccomp_attach_filter: Attaches a seccomp filter to current.
* @fprog: BPF program to install
@@ -490,8 +506,7 @@ static long seccomp_set_mode(unsigned lo
{
long ret = -EINVAL;
- if (current->seccomp.mode &&
- current->seccomp.mode != seccomp_mode)
+ if (!seccomp_may_assign_mode(seccomp_mode))
goto out;
switch (seccomp_mode) {
@@ -512,8 +527,7 @@ static long seccomp_set_mode(unsigned lo
goto out;
}
- current->seccomp.mode = seccomp_mode;
- set_thread_flag(TIF_SECCOMP);
+ seccomp_assign_mode(seccomp_mode);
out:
return ret;
}
