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lkdtm/bugs: Switch from 1-element array to flexible array

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The testing for ARRAY_BOUNDS just wants an uninstrumented array,
and the proper flexible array definition is fine for that.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bill Wendling <morbo@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
2023-05-22 14:28:46 -07:00
parent 7391928025
commit b45861ed66
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/lkdtm/bugs.c
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@@ -309,7 +309,7 @@ static void lkdtm_OVERFLOW_UNSIGNED(void)
struct array_bounds_flex_array { struct array_bounds_flex_array {
int one; int one;
int two; int two;
char data[1]; char data[];
}; };
struct array_bounds { struct array_bounds {
@@ -341,7 +341,7 @@ static void lkdtm_ARRAY_BOUNDS(void)
* For the uninstrumented flex array member, also touch 1 byte * For the uninstrumented flex array member, also touch 1 byte
* beyond to verify it is correctly uninstrumented. * beyond to verify it is correctly uninstrumented.
*/ */
for (i = 0; i < sizeof(not_checked->data) + 1; i++) for (i = 0; i < 2; i++)
not_checked->data[i] = 'A'; not_checked->data[i] = 'A';
pr_info("Array access beyond bounds ...\n"); pr_info("Array access beyond bounds ...\n");