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| author | Alan Modra <amodra@gmail.com> | 2020-06-23 23:50:56 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2020-06-24 00:50:48 +0930 |
| commit | 9221725d1f6e3f5dd0c0143ee750460619c582f2 (patch) | |
| tree | d3c8991309aa4961a98a10489063eb6bc70ef8d9 | |
| parent | 39f381cb80463bd814da549a927bee4643d4ceac (diff) | |
| download | gdb-9221725d1f6e3f5dd0c0143ee750460619c582f2.zip gdb-9221725d1f6e3f5dd0c0143ee750460619c582f2.tar.gz gdb-9221725d1f6e3f5dd0c0143ee750460619c582f2.tar.bz2 | |
PR26150, Assertion when asm() defines global symbols, -flto and --start-group
If an archive map contains symbols that aren't actually defined by the
indexed element for any reason, then loading that element will leave
the symbol undefined (or common). This leads to the possibility of
the element being loaded again should the archive be searched again
due to the action of --start-group/--end-group. The testcase
triggering this problem was an archive containing fat lto objects,
with the archive map incorrectly created by ar rather than gcc-ar.
PR 26150
* ldlang.c (ldlang_add_file): Assert that we aren't adding the
current end of link.next list again too.
* ldmain.c (add_archive_element): Don't load archive elements
again that have already been loaded.
| -rw-r--r-- | ld/ChangeLog | 8 | ||||
| -rw-r--r-- | ld/ldlang.c | 3 | ||||
| -rw-r--r-- | ld/ldmain.c | 21 |
3 files changed, 27 insertions, 5 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog index d59b00b..a2e3f62 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,5 +1,13 @@ 2020-06-23 Alan Modra <amodra@gmail.com> + PR 26150 + * ldlang.c (ldlang_add_file): Assert that we aren't adding the + current end of link.next list again too. + * ldmain.c (add_archive_element): Don't load archive elements + again that have already been loaded. + +2020-06-23 Alan Modra <amodra@gmail.com> + * testsuite/ld-elf/shared.exp (pr14170): Clear xfail for bfin-*-linux*. (pr17068, symbolic-func.so, pr22374): Likewise. diff --git a/ld/ldlang.c b/ld/ldlang.c index 8ab6a0b..38ed83a 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -7266,7 +7266,8 @@ ldlang_add_file (lang_input_statement_type *entry) /* The BFD linker needs to have a list of all input BFDs involved in a link. */ - ASSERT (entry->the_bfd->link.next == NULL); + ASSERT (link_info.input_bfds_tail != &entry->the_bfd->link.next + && entry->the_bfd->link.next == NULL); ASSERT (entry->the_bfd != link_info.output_bfd); *link_info.input_bfds_tail = entry->the_bfd; diff --git a/ld/ldmain.c b/ld/ldmain.c index d34d30a..94a745e 100644 --- a/ld/ldmain.c +++ b/ld/ldmain.c @@ -822,10 +822,6 @@ add_archive_element (struct bfd_link_info *info, input->local_sym_name = bfd_get_filename (abfd); input->the_bfd = abfd; - parent = bfd_usrdata (abfd->my_archive); - if (parent != NULL && !parent->flags.reload) - parent->next = input; - /* Save the original data for trace files/tries below, as plugins (if enabled) may possibly alter it to point to a replacement BFD, but we still want to output the original BFD filename. */ @@ -853,6 +849,23 @@ add_archive_element (struct bfd_link_info *info, } #endif /* BFD_SUPPORTS_PLUGINS */ + if (link_info.input_bfds_tail == &input->the_bfd->link.next + || input->the_bfd->link.next != NULL) + { + /* We have already loaded this element, and are attempting to + load it again. This can happen when the archive map doesn't + match actual symbols defined by the element. */ + free (input); + bfd_set_error (bfd_error_malformed_archive); + return FALSE; + } + + /* Set the file_chain pointer of archives to the last element loaded + from the archive. See ldlang.c:find_rescan_insertion. */ + parent = bfd_usrdata (abfd->my_archive); + if (parent != NULL && !parent->flags.reload) + parent->next = input; + ldlang_add_file (input); if (config.map_file != NULL) |