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binder: use cred instead of task for getsecid

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commit 4d5b5539742d2554591751b4248b0204d20dcc9d upstream.

Use the 'struct cred' saved at binder_open() to lookup
the security ID via security_cred_getsecid(). This
ensures that the security context that opened binder
is the one used to generate the secctx.

Cc: stable@vger.kernel.org # 5.4+
Fixes: ec74136ded ("binder: create node flag to request sender's security context")
Signed-off-by: Todd Kjos <tkjos@google.com>
Suggested-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos
2021-11-10 15:00:36 -08:00
committed by Greg Kroah-Hartman
parent 0d9f4ae7cd
commit afbec52fbc
2 changed files with 6 additions and 1 deletions
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5
include/linux/security.h
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@@ -1003,6 +1003,11 @@ static inline void security_transfer_creds(struct cred *new,
{
}
static inline void security_cred_getsecid(const struct cred *c, u32 *secid)
{
*secid = 0;
}
static inline int security_kernel_act_as(struct cred *cred, u32 secid)
{
return 0;