tree 1c2a7d64f216df552e4509dc746d8da3436e39ab
parent 400eeffaffc7232c0ae1134fe04e14ae4fb48d8c
author Russell King <rmk+kernel@armlinux.org.uk> 1511567374 +0000
committer Russell King <rmk+kernel@armlinux.org.uk> 1511710899 +0000

ARM: BUG if jumping to usermode address in kernel mode

Detect if we are returning to usermode via the normal kernel exit paths
but the saved PSR value indicates that we are in kernel mode.  This
could occur due to corrupted stack state, which has been observed with
"ftracetest".

This ensures that we catch the problem case before we get to user code.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>