ARM: net: bpf: fix register saving

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commit 02088d9b39 upstream.

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: 39c13c204b ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Russell King 2018-01-13 22:38:18 +00:00 • committed by Greg Kroah-Hartman

parent 295bcfbbcf

commit 0da4a4d0c7

1 changed files with 22 additions and 58 deletions

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arch/arm/net/bpf_jit_32.c

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