When doing a scratch build of xen against the [ELN] gcc 11 side tag I get the following error which looks to me like a compiler issue tboot.c: In function 'tboot_probe': /builddir/build/BUILD/xen-4.14.0/xen/include/xen/string.h:101:27: error: '__builtin_memcmp_eq' specified bound 16 exceeds source size 0 [-Werror=stringop-overread] 101 | #define memcmp(s1, s2, n) __builtin_memcmp(s1, s2, n) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ tboot.c:105:10: note: in expansion of macro 'memcmp' 105 | if ( memcmp(&tboot_shared_uuid, (uuid_t *)tboot_shared, sizeof(uuid_t)) ) | ^~~~~~ cc1: all warnings being treated as errors If I replace memcmp with (memcmp) in line 105, thus picking up a copy of memcmp with the xen code, then it builds successfully.
This one is already on my radar as it's flagged by the sidetag build that's already in progress.
I've worked around this with one well placed volatile in tboot_probe while Martin and I work out how the improvements in the stringop-overflow checks should interact with this kind of low level code.
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle. Changing version to 34.
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Fedora Linux 34 entered end-of-life (EOL) status on 2022-06-07. Fedora Linux 34 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. Thank you for reporting this bug and we are sorry it could not be fixed.