tree 7dd2b1eb8b47f46e6d621a81a745d4158a002182
parent 0005e55a79cfda88199e41a406a829c88d708c67
author Russell King <rmk+kernel@armlinux.org.uk> 1515883098 +0000
committer Russell King <rmk+kernel@armlinux.org.uk> 1516217887 +0000

ARM: net: bpf: fix register saving

When an eBPF program tail-calls another eBPF program, it enters it after
the prologue to avoid having complex stack manipulations.  This can lead
to kernel oopses, and similar.

Resolve this by always using a fixed stack layout, a CPU register frame
pointer, and using this when reloading registers before returning.

Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>