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kconfig: require a space after '#' for valid input

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Currently, when an input line starts with '#', (line + 2) is passed to
memcmp() without checking line[1].

It means that line[1] can be any arbitrary character. For example,
"#KCONFIG_FOO is not set" is accepted as valid input, functioning the
same as "# CONFIG_FOO is not set".

More importantly, this can potentially lead to a buffer overrun if
line[1] == '\0'. It occurs if the input only contains '#', as
(line + 2) points to an uninitialized buffer.

Check line[1], and skip the line if it is not a space.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2023-11-18 16:59:07 +09:00
parent 61e3e3c21a
commit 4d137ab010
1 changed files with 2 additions and 0 deletions
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2
scripts/kconfig/confdata.c
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@ -426,6 +426,8 @@ int conf_read_simple(const char *name, int def)
conf_lineno++;
sym = NULL;
if (line[0] == '#') {
if (line[1] != ' ')
continue;
if (memcmp(line + 2, CONFIG_, strlen(CONFIG_)))
continue;
p = strchr(line + 2 + strlen(CONFIG_), ' ');