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bpf: fix false overflow in eBPF ELF backend linker

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When performing DISP{16,32} relocations, the eBPF ELF backend linker
needs to convert the relocation from an address into a signed number
of 64-bit words (minus one) to jump.

Because of this unsigned-to-signed conversion, special care needs to
be taken when dividing to ensure the sign bits remain correct.
Otherwise, a false relocation overflow error can be triggered.

bfd/ChangeLog

2020-08-07  David Faust  <david.faust@oracle.com>

	* elf64-bpf.c (bpf_elf_relocate_section): Ensure signed division for
	DISP16 and DISP32 relocations.

ld/ChangeLog

2020-08-07  David Faust  <david.faust@oracle.com>

	* testsuite/ld-bpf/call-3.s: New file.
	* testsuite/ld-bpf/call-3.d: Likewise.
This commit is contained in:
David Faust
2020-08-07 20:36:47 +02:00
committed by Jose E. Marchesi
parent fe4c3d430b
commit d844f10ac2
3 changed files with 15 additions and 4 deletions
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ld/ChangeLog
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@ -1,3 +1,8 @@
2020-08-07 David Faust <david.faust@oracle.com>
* testsuite/ld-bpf/call-3.s: New file.
* testsuite/ld-bpf/call-3.d: Likewise.
2020-08-05 David Faust <david.faust@oracle.com>
* testsuite/ld-bpf/call-2.s: New file.