ARM: net: bpf: fix LDX instructions

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commit ec19e02b34 upstream.

When the source and destination register are identical, our JIT does not
generate correct code, which leads to kernel oopses.

Fix this by (a) generating more efficient code, and (b) making use of
the temporary earlier if we will overwrite the address register.

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 21:06:16 +00:00 • committed by Greg Kroah-Hartman

parent 0da4a4d0c7

commit 5911dd3f92

1 changed files with 33 additions and 28 deletions

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arch/arm/net/bpf_jit_32.c

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