On Mon, Jan 17, 2022 at 01:37:08PM -0600, Justin Forbes wrote: > > For kernel, the only bug on the GCC side I'm aware of is > > https://gcc.gnu.org/PR101941 > > We are seeing similar issues in a few different files depending on > arch. Largely due to options compiled in and compile order, nothing > particularly arch specific. All of the failures are with > fortify_string, some are read beyond size of object. Some are write > beyond size of object. Some are directive output may be truncated. > These kernels all build fine against f35 and stable fedora kernels > fail against rawhide, so it is definitely the toolchain changes, and > not limited to bad code brought in through the 5.17 merge window. A > good sampling of the errors can be seen in the build log for > https://koji.fedoraproject.org/koji/taskinfo?taskID=81369256 with most > arches failing in different places. All I've looked at (besides PR101941) was check.c:2836:58: error: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 9 [-Werror=format-truncation=] which boils down to roughly: char a[16]; void f (int x, int y) { int idx; if (y) { idx = x / sizeof (void *); snprintf (a, sizeof a, "pv_ops[%d]", idx); } } where the warning doesn't seem to be a false positive, though perhaps it would need to be a very large module. pv_ops[-268435456] is the longest string for lp64 and pv_ops[-536870912] for ilp32, but even when not negative, pv_ops[536870911] is 18 bytes including zero termination, not 16. If you have other warnings and they seem to be false positives, please send them to Martin Sebor. Jakub _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
