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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-12-28 05:28:49 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-01-13 15:17:05 -0800 |
| commit | 44fd8887d0dc705ee5a8e52153282292841e0a01 (patch) | |
| tree | b8bd935001f5a84bd73010b65f0d9d978f1dfed0 /sysdeps/arm/memcpy.S | |
| parent | 4a68828e3781cd6f61f792daa1dd5904a8f45288 (diff) | |
| download | glibc-44fd8887d0dc705ee5a8e52153282292841e0a01.tar.gz glibc-44fd8887d0dc705ee5a8e52153282292841e0a01.tar.xz glibc-44fd8887d0dc705ee5a8e52153282292841e0a01.zip | |
x86: Check IFUNC definition in unrelocated executable [BZ #20019]
Calling an IFUNC function defined in unrelocated executable also leads to segfault. Issue a fatal error message when calling IFUNC function defined in the unrelocated executable from a shared library. On x86, ifuncmain6pie failed with: [hjl@gnu-cfl-2 build-i686-linux]$ ./elf/ifuncmain6pie --direct ./elf/ifuncmain6pie: IFUNC symbol 'foo' referenced in '/export/build/gnu/tools-build/glibc-32bit/build-i686-linux/elf/ifuncmod6.so' is defined in the executable and creates an unsatisfiable circular dependency. [hjl@gnu-cfl-2 build-i686-linux]$ readelf -rW elf/ifuncmod6.so | grep foo 00003ff4 00000706 R_386_GLOB_DAT 0000400c foo_ptr 00003ff8 00000406 R_386_GLOB_DAT 00000000 foo 0000400c 00000401 R_386_32 00000000 foo [hjl@gnu-cfl-2 build-i686-linux]$ Remove non-JUMP_SLOT relocations against foo in ifuncmod6.so, which trigger the circular IFUNC dependency, and build ifuncmain6pie with -Wl,-z,lazy. (cherry picked from commits 6ea5b57afa5cdc9ce367d2b69a2cebfb273e4617 and 7137d682ebfcb6db5dfc5f39724718699922f06c)
Diffstat (limited to 'sysdeps/arm/memcpy.S')
0 files changed, 0 insertions, 0 deletions