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eeb7b079d5
The iovec size should account for all substrings between each conversion specification. For the format: "abc %s efg" The list of substrings are: ["abc ", arg, " efg] which is 2 times the number of maximum arguments *plus* one. This issue triggered 'out of bounds' errors by stdlib/tst-bz20544 when glibc is built with experimental UBSAN support [1]. Besides adjusting the iovec size, a new runtime and check is added to avoid wrong __libc_message_impl usage. Checked on x86_64-linux-gnu. [1] https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/azanella/ubsan-undef Co-authored-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>