On Thu, Mar 23, 2023 at 3:11 AM Ben Hutchings ben@decadent.org.uk wrote:

modpost now reads CRCs from .*.cmd files, parsing them using strtol(). This is inconsistent with its parsing of Module.symvers and with their definition as *unsigned* 32-bit values.

strtol() clamps values to [LONG_MIN, LONG_MAX], and when building on a 32-bit system this changes all CRCs >= 0x80000000 to be 0x7fffffff.

Change extract_crcs_for_object() to use strtoul() instead.

Cc: stable@vger.kernel.org Fixes: f292d875d0dc ("modpost: extract symbol versions from *.cmd files") Signed-off-by: Ben Hutchings ben@decadent.org.uk

---

Applied to linux-kbuild/fixes. Thanks.

scripts/mod/modpost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index efff8078e395..9466b6a2abae 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1733,7 +1733,7 @@ static void extract_crcs_for_object(const char *object, struct module *mod) if (!isdigit(*p)) continue; /* skip this line */

•           crc = strtol(p, &p, 0);
  

•           crc = strtoul(p, &p, 0);
            if (*p != '\n')
                    continue;       /* skip this line */