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| author | Douglas Anderson <dianders@chromium.org> | 2020-05-07 13:08:44 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-22 09:05:11 +0200 |
| commit | 04980e41634f6c4b38de530d6aa7ce7f14f5234b (patch) | |
| tree | cc197fed30a76a984ec293f6ca845639b0593e03 /kernel/debug | |
| parent | b6f50bfa774da31cd8e4f00fb027aaac9a560bf5 (diff) | |
| download | linux-04980e41634f6c4b38de530d6aa7ce7f14f5234b.tar.gz linux-04980e41634f6c4b38de530d6aa7ce7f14f5234b.tar.bz2 linux-04980e41634f6c4b38de530d6aa7ce7f14f5234b.zip | |
kgdb: Prevent infinite recursive entries to the debugger
[ 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>
Diffstat (limited to 'kernel/debug')
| -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 d2799767aab8..6a1dc2613bb9 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"); } |