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0f9afc265a
glibc/sysdeps/x86_64
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H.J. Lu 0f9afc265a x32: Handle displacement overflow in PLT rewrite [BZ #31218] 
PLT rewrite calculated displacement with

ElfW(Addr) disp = value - branch_start - JMP32_INSN_SIZE;

On x32, displacement from 0xf7fbe060 to 0x401030 was calculated as

unsigned int disp = 0x401030 - 0xf7fbe060 - 5;

with disp == 0x8442fcb and caused displacement overflow. The PLT entry
was changed to:

0xf7fbe060 <+0>:	e9 cb 2f 44 08     	jmp    0x401030
0xf7fbe065 <+5>:	cc                 	int3
0xf7fbe066 <+6>:	cc                 	int3
0xf7fbe067 <+7>:	cc                 	int3
0xf7fbe068 <+8>:	cc                 	int3
0xf7fbe069 <+9>:	cc                 	int3
0xf7fbe06a <+10>:	cc                 	int3
0xf7fbe06b <+11>:	cc                 	int3
0xf7fbe06c <+12>:	cc                 	int3
0xf7fbe06d <+13>:	cc                 	int3
0xf7fbe06e <+14>:	cc                 	int3
0xf7fbe06f <+15>:	cc                 	int3

x32 has 32-bit address range, but it doesn't wrap address around at 4GB,
JMP target was changed to 0x100401030 (0xf7fbe060LL + 0x8442fcbLL + 5),
which is above 4GB.

Always use uint64_t to calculate displacement.  This fixes BZ #31218.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
2024-01-06 14:25:49 -08:00
..
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x32 Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
____longjmp_chk.S
__longjmp.S x86-64/cet: Check the restore token in longjmp 2024-01-04 13:38:26 -08:00
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abort-instr.h
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configure elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
configure.ac elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
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l10nflist.c
link_map.h elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
link-defines.sym
locale-defines.sym
localplt.data elf: Rework exception handling in the dynamic loader [BZ #25486] 2022-11-03 09:39:31 +01:00
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Makefile x32: Handle displacement overflow in PLT rewrite [BZ #31218] 2024-01-06 14:25:49 -08:00
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memcpy.S x86_64: Fix build with --disable-multiarch (BZ 30721) 2023-08-10 10:29:29 -03:00
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tst-plt-rewritemod1.c elf: Add ELF_DYNAMIC_AFTER_RELOC to rewrite PLT 2024-01-05 05:49:49 -08:00
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