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authorTodd Kjos <tkjos@google.com>2021-10-12 19:56:14 +0300
committerPaul Moore <paul@paul-moore.com>2021-10-15 03:48:43 +0300
commit4d5b5539742d2554591751b4248b0204d20dcc9d (patch)
treee7385a6ef0db22a34eb98d69ec2983ecd57bb515 /drivers/android
parent52f88693378a58094c538662ba652aff0253c4fe (diff)
downloadlinux-4d5b5539742d2554591751b4248b0204d20dcc9d.tar.xz
binder: use cred instead of task for getsecid
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: ec74136ded79 ("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>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binder.c11
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1571e01cfa52..49b08c04fa09 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2713,16 +2713,7 @@ static void binder_transaction(struct binder_proc *proc,
u32 secid;
size_t added_size;
- /*
- * Arguably this should be the task's subjective LSM secid but
- * we can't reliably access the subjective creds of a task
- * other than our own so we must use the objective creds, which
- * are safe to access. The downside is that if a task is
- * temporarily overriding it's creds it will not be reflected
- * here; however, it isn't clear that binder would handle that
- * case well anyway.
- */
- security_task_getsecid_obj(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;