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    Subject[PATCH 4.14 086/190] kgdb: Prevent infinite recursive entries to the debugger
    Date
    From: Douglas Anderson <dianders@chromium.org>

    [ Upstream commit 3ca676e4ca60d1834bb77535dafe24169cadacef ]

    If we detect that we recursively entered the debugger we should hack
    our I/O ops to NULL so that the panic() in the next line won't
    actually cause another recursion into the debugger. The first line of
    kgdb_panic() will check this and return.

    Signed-off-by: Douglas Anderson <dianders@chromium.org>
    Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
    Link: https://lore.kernel.org/r/20200507130644.v4.6.I89de39f68736c9de610e6f241e68d8dbc44bc266@changeid
    Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    kernel/debug/debug_core.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
    index 94aa9ae0007a..159a53ff2716 100644
    --- a/kernel/debug/debug_core.c
    +++ b/kernel/debug/debug_core.c
    @@ -444,6 +444,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks)

    if (exception_level > 1) {
    dump_stack();
    + kgdb_io_module_registered = false;
    panic("Recursive entry to debugger");
    }

    --
    2.25.1


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