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| author | Douglas Anderson <dianders@chromium.org> | 2020-05-07 13:08:44 -0700 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2020-05-18 17:49:27 +0100 |
| commit | 3ca676e4ca60d1834bb77535dafe24169cadacef (patch) | |
| tree | 635e65fbf37431f26df8374d46db8d069b664e78 /kernel | |
| parent | b1a57bbfcc17c87e5cc76695ebb0565380c7501a (diff) | |
| download | linux-stable-3ca676e4ca60d1834bb77535dafe24169cadacef.tar.gz linux-stable-3ca676e4ca60d1834bb77535dafe24169cadacef.tar.bz2 linux-stable-3ca676e4ca60d1834bb77535dafe24169cadacef.zip | |
kgdb: Prevent infinite recursive entries to the debugger
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/debug/debug_core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 1cd8e8b41115..e2d67b163fb6 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -530,6 +530,7 @@ 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"); } |