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(parent: 400eeff) | patch
ARM: BUG if jumping to usermode address in kernel mode
authorRussell King <rmk+kernel@armlinux.org.uk>
Fri, 24 Nov 2017 23:49:34 +0000 (23:49 +0000)
committerRussell King <rmk+kernel@armlinux.org.uk>
Sun, 26 Nov 2017 15:41:39 +0000 (15:41 +0000)
commit8bafae202c82dc257f649ea3c275a0f35ee15113
tree1c2a7d64f216df552e4509dc746d8da3436e39abtree | snapshot
parent400eeffaffc7232c0ae1134fe04e14ae4fb48d8ccommit | diff
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>
arch/arm/include/asm/assembler.h diff | blob | history
arch/arm/kernel/entry-header.S diff | blob | history
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