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authorSumanth Korikkar <sumanthk@linux.ibm.com>2024-03-07 11:46:11 +0300
committerHeiko Carstens <hca@linux.ibm.com>2024-03-07 19:02:05 +0300
commitfa9e3139e6c5ac756e1ab2a6c7eca99eb684a2fe (patch)
tree267c8dc97f4ab7aefac21ba8f9a58b3a3a3449b4 /Documentation/process/botching-up-ioctls.rst
parentcb0cd4ee11142339f2d47eef6db274290b7a482d (diff)
downloadlinux-fa9e3139e6c5ac756e1ab2a6c7eca99eb684a2fe.tar.xz
s390/tools: handle rela R_390_GOTPCDBL/R_390_GOTOFF64
lkp test robot reported unhandled relocation type: R_390_GOTPCDBL, when kernel is built with -fno-PIE. relocs tool reads vmlinux and handles absolute relocations. PC relative relocs doesn't need adjustment. Also, the R_390_GOTPCDBL/R_390_GOTOFF64 relocations are present currently only when KASAN is enabled. The following program can create a R_390_GOTPCDBL/R_390_GOTOFF64 reloc (with fPIE/fPIC). void funcb(int *b) { *b = *b + 100; } void gen_gotoff(void) { int b = 10; funcb (&b); } gcc -c sample.c -fPIC -fsanitize=kernel-address --param asan-stack=1 The above example (built with -fPIC) was linked to one of the built-in.a (built with -fno-PIE) and checked for correctness with kaslr enabled. Both the relocs turns out relative and can be skipped. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202402221404.T2TGs8El-lkp@intel.com/ Fixes: 55dc65b46023 ("s390: add relocs tool") Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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