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    Subject[PATCH 3.8 097/121] s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH
    Date
    3.8.13.24 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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: Kamal Mostafa <kamal@canonical.com>
    ---
    arch/s390/net/bpf_jit_comp.c | 1 -
    1 file changed, 1 deletion(-)

    diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
    index 5e92f47..ab9e3f4 100644
    --- a/arch/s390/net/bpf_jit_comp.c
    +++ b/arch/s390/net/bpf_jit_comp.c
    @@ -242,7 +242,6 @@ 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:
    --
    1.9.1


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