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@xxxxxxxxxxxxxxx # 5.4+
Fixes: ec74136ded79 ("binder: create node flag to request sender's security context")
Signed-off-by: Todd Kjos <tkjos@xxxxxxxxxx>
Suggested-by: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Acked-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Change-Id: Ia7b59804a0bdbd51191bbcca556414840307c623
---
drivers/android/binder.c | 2 +-
include/linux/security.h | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index cebb2cd1876c..c2c411c458b2 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3107,7 +3107,7 @@ static void binder_transaction(struct binder_proc *proc,
u32 secid;
size_t added_size;
- security_task_getsecid(proc->tsk, &secid);
+ security_cred_getsecid(proc->cred, &secid);
ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
if (ret) {
return_error = BR_FAILED_REPLY;
diff --git a/include/linux/security.h b/include/linux/security.h
index 0d4cb64cae1f..3f6b8195ae9e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -985,6 +985,11 @@ 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;
--
2.34.0.rc0.344.g81b53c2807-goog
