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kgdb: fix to kill breakpoints on initmem after boot

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commit d54ce6158e354f5358a547b96299ecd7f3725393 upstream.

Currently breakpoints in kernel .init.text section are not handled
correctly while allowing to remove them even after corresponding pages
have been freed.

Fix it via killing .init.text section breakpoints just prior to initmem
pages being freed.

Doug: "HW breakpoints aren't handled by this patch but it's probably
not such a big deal".

Link: https://lkml.kernel.org/r/20210224081652.587785-1-sumit.garg@linaro.org
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Suggested-by: Doug Anderson <dianders@chromium.org>
Acked-by: Doug Anderson <dianders@chromium.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sumit Garg
2021-02-25 17:22:38 -08:00
committed by Greg Kroah-Hartman
parent c51f98210a
commit 13e83186c9
3 changed files with 14 additions and 0 deletions
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init/main.c
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@@ -1417,6 +1417,7 @@ static int __ref kernel_init(void *unused)
async_synchronize_full();
kprobe_free_init_mem();
ftrace_free_init_mem();
kgdb_free_init_mem();
free_initmem();
mark_readonly();