From FEDORA_PATCHES Mon Sep 17 00:00:00 2001 From: Keith Seitz Date: Mon, 16 Nov 2020 12:42:09 -0500 Subject: gdb-rhbz1898252-loadable-section-outside-ELF-segments.patch ;; Backport of "Exclude debuginfo files from 'outside of ELF segments' ;; warning" (Keith Seitz) Exclude debuginfo files from "outside of ELF segments" warning When GDB loads an ELF file, it will warn when a section is not located in an ELF segment: $ ./gdb -q -iex "set build-id-verbose 0" --ex "b systemctl_main" -ex "r" -batch --args systemctl kexec Breakpoint 1 at 0xc24d: file ../src/systemctl/systemctl.c, line 8752. warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libgcc_s.so.1 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libcap.so.2 warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libacl.so.1 warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libcryptsetup.so.12 warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libgcrypt.so.20 warning: Loadable section ".note.gnu.property" outside of ELF segments in .gnu_debugdata for /lib64/libip4tc.so.2 [snip] This has feature has also been reported by various users, most notably the Fedora-EOL'd bug 1553086. Mark Wielaard explains the issue quite nicely in https://sourceware.org/bugzilla/show_bug.cgi?id=24717#c2 The short of it is, the ELF program headers for debuginfo files are not suited to this particular use case. Consequently, the warning generated above really is useless and should be ignored. This patch follows the same heuristic that BFD itself uses. gdb/ChangeLog 2020-11-13 Keith Seitz https://bugzilla.redhat.com/show_bug.cgi?id=1553086 * elfread.c (elf_symfile_segments): Omit "Loadable section ... outside of ELF segments" warning for debugin diff --git a/gdb/elfread.c b/gdb/elfread.c --- a/gdb/elfread.c +++ b/gdb/elfread.c @@ -147,7 +147,12 @@ struct elfinfo RealView) use SHT_NOBITS for uninitialized data. Since it is uninitialized, it doesn't need a program header. Such binaries are not relocatable. */ - if (bfd_section_size (sect) > 0 && j == num_segments + + /* Exclude debuginfo files from this warning, too, since those + are often not strictly compliant with the standard. See, e.g., + ld/24717 for more discussion. */ + if (!is_debuginfo_file (abfd) + && bfd_section_size (sect) > 0 && j == num_segments && (bfd_section_flags (sect) & SEC_LOAD) != 0) warning (_("Loadable section \"%s\" outside of ELF segments"), bfd_section_name (sect));