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authorH.J. Lu <hjl.tools@gmail.com>2017-09-26 13:49:48 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-09-26 13:50:01 -0700
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Skip PT_DYNAMIC segment with p_filesz == 0 [BZ #22101]
ELF objects generated with "objcopy --only-keep-debug" have Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align DYNAMIC 0x0+e28 0x0+200e40 0x0+200e40 0x0+ 0x0+1a0 RW 0x8 with 0 file size. ld.so should skip such PT_DYNAMIC segments. Without a PT_DYNAMIC segment the loading of the shared object will fail, and therefore ldd on such objects will also fail instead of crashing. This provides better diagnostics for tooling that is attempting to inspect the invalid shared objects which may just contain debug information. [BZ #22101] * elf/Makefile (tests): Add tst-debug1. ($(objpfx)tst-debug1): New. ($(objpfx)tst-debug1.out): Likewise. ($(objpfx)tst-debug1mod1.so): Likewise. * elf/dl-load.c (_dl_map_object_from_fd): Skip PT_DYNAMIC segment with p_filesz == 0. * elf/tst-debug1.c: New file. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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