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Subject[C/R v20][PATCH 72/96] Expose may_setuid() in user.h and add may_setgid() (v2)
Date
From: Dan Smith <danms@us.ibm.com>

Make these helpers available to others.

Changes in v2:
- Avoid checking the groupinfo in ctx->realcred against the current in
may_setgid()

Signed-off-by: Dan Smith <danms@us.ibm.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Serge E. Hallyn <serue@us.ibm.com>
---
include/linux/user.h | 9 +++++++++
kernel/user.c | 13 ++++++++++++-
2 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/include/linux/user.h b/include/linux/user.h
index 68daf84..c231e9c 100644
--- a/include/linux/user.h
+++ b/include/linux/user.h
@@ -1 +1,10 @@
+#ifndef _LINUX_USER_H
+#define _LINUX_USER_H
+
#include <asm/user.h>
+#include <linux/sched.h>
+
+extern int may_setuid(struct user_namespace *ns, uid_t uid);
+extern int may_setgid(gid_t gid);
+
+#endif
diff --git a/kernel/user.c b/kernel/user.c
index 15f762c..8ddafea 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -604,7 +604,7 @@ int checkpoint_user(struct ckpt_ctx *ctx, void *ptr)
return do_checkpoint_user(ctx, (struct user_struct *) ptr);
}

-static int may_setuid(struct user_namespace *ns, uid_t uid)
+int may_setuid(struct user_namespace *ns, uid_t uid)
{
/*
* this next check will one day become
@@ -631,6 +631,17 @@ static int may_setuid(struct user_namespace *ns, uid_t uid)
return 0;
}

+int may_setgid(gid_t gid)
+{
+ if (capable(CAP_SETGID))
+ return 1;
+
+ if (in_egroup_p(gid))
+ return 1;
+
+ return 0;
+}
+
static struct user_struct *do_restore_user(struct ckpt_ctx *ctx)
{
struct user_struct *u;
--
1.6.3.3


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