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s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH 

commit 6e0de81759 upstream.

The A register needs to be initialized to zero in the prolog if the
first instruction of the BPF program is BPF_S_LDX_B_MSH to prevent
leaking the content of %r5 to user space.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Schwidefsky 2014-04-25 10:53:44 +02:00 committed by Greg Kroah-Hartman
parent 8ba2a0e064
commit c180afb403
1 changed files with 0 additions and 1 deletions
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1
arch/s390/net/bpf_jit_comp.c
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@ -276,7 +276,6 @@ static void bpf_jit_noleaks(struct bpf_jit *jit, struct sock_filter *filter)
case BPF_S_LD_W_IND:
case BPF_S_LD_H_IND:
case BPF_S_LD_B_IND:
case BPF_S_LDX_B_MSH:
case BPF_S_LD_IMM:
case BPF_S_LD_MEM:
case BPF_S_MISC_TXA: