| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 22/83] s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH | Date | Sun, 11 May 2014 21:19:23 +0200 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Martin Schwidefsky <schwidefsky@de.ibm.com>
commit 6e0de817594c61f3b392a9245deeb09609ec707d 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>
--- arch/s390/net/bpf_jit_comp.c | 1 - 1 file changed, 1 deletion(-)
--- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -276,7 +276,6 @@ static void bpf_jit_noleaks(struct bpf_j 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:
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