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(parent: 75fe3b0) | 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)
commit7fc412ffe482b6f1698f52dee8d2e57d074e9503
tree1c2a7d64f216df552e4509dc746d8da3436e39abtree | snapshot
parent75fe3b0399a61fd3f6c0bf3c9120bf2365f2a6f4commit | 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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