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kgdb: Prevent infinite recursive entries to the debugger

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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>
This commit is contained in:
Douglas Anderson 2020-05-07 13:08:44 -07:00 committed by Daniel Thompson
parent b1a57bbfcc
commit 3ca676e4ca
1 changed files with 1 additions and 0 deletions
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kernel/debug/debug_core.c
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@ -530,6 +530,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
if (exception_level > 1) { if (exception_level > 1) {
dump_stack(); dump_stack();
kgdb_io_module_registered = false;
panic("Recursive entry to debugger"); panic("Recursive entry to debugger");
} }