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kdb: Fix a potential buffer overflow in kdb_local()

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[ Upstream commit 4f41d30cd6dc865c3cbc1a852372321eba6d4e4c ]

When appending "[defcmd]" to 'kdb_prompt_str', the size of the string
already in the buffer should be taken into account.

An option could be to switch from strncat() to strlcat() which does the
correct test to avoid such an overflow.

However, this actually looks as dead code, because 'defcmd_in_progress'
can't be true here.
See a more detailed explanation at [1].

[1]: https://lore.kernel.org/all/CAD=FV=WSh7wKN7Yp-3wWiDgX4E3isQ8uh0LCzTmd1v9Cg9j+nQ@mail.gmail.com/

Fixes: 5d5314d679 ("kdb: core for kgdb back end (1 of 2)")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christophe JAILLET 2023-11-25 13:05:04 +01:00 committed by Greg Kroah-Hartman
parent cf6260a34d
commit d5661f46c1
1 changed files with 0 additions and 2 deletions
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2
kernel/debug/kdb/kdb_main.c
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@ -1365,8 +1365,6 @@ do_full_getstr:
/* PROMPT can only be set if we have MEM_READ permission. */
snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
raw_smp_processor_id());
if (defcmd_in_progress)
strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
/*
* Fetch command from keyboard