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x86: reject relocations involving registers

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To prevent fatal or even internal errors, add a simple check to
i386_validate_fix(), rejecting relocations when their target symbol is
an equate of a register (or resolved to reg_section for any other
reason).
This commit is contained in:
Jan Beulich 2022-03-23 12:31:29 +01:00
parent 64d23078e3
commit e52a16f2aa
2 changed files with 17 additions and 0 deletions
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11
gas/config/tc-i386.c
View file

@ -14188,6 +14188,17 @@ i386_cons_align (int ignore ATTRIBUTE_UNUSED)
int
i386_validate_fix (fixS *fixp)
{
if (fixp->fx_addsy && S_GET_SEGMENT(fixp->fx_addsy) == reg_section)
{
reloc_howto_type *howto;
howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
as_bad_where (fixp->fx_file, fixp->fx_line,
_("invalid %s relocation against register"),
howto ? howto->name : "<unknown>");
return 0;
}
#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
if (fixp->fx_r_type == BFD_RELOC_SIZE32
|| fixp->fx_r_type == BFD_RELOC_SIZE64)

6
gas/testsuite/gas/i386/inval-equ-2.l
View file

@ -1,4 +1,7 @@
.*: Assembler messages:
.*:3: Error: .*
.*:5: Error: .*
.*:8: Error: .*
.*: Error: .*
.*: Error: .*
.*: Error: .*
@ -15,6 +18,9 @@ GAS LISTING .*
[ ]*6[ ]+\.globl bar2
[ ]*7[ ]+\.set bar3,\(%eax\+1\)
[ ]*8[ ]+\?\?\?\? A1...... mov bar3,%eax
.* Error: invalid .* relocation against register
.* Error: invalid .* relocation against register
.* Error: invalid .* relocation against register
.* Error: can't make global register symbol `bar1'
.* Error: can't make global register symbol `bar2'
.* Error: can't make global register symbol `bar3'