https://sourceware.org/bugzilla/show_bug.cgi?id=26972
Bug ID: 26972
Summary: R_X86_64_TLSDESC_CALL/R_X86_64_GOTPC32_TLSDESC need
improvement
Product: binutils
Version: 2.36 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: hjl.tools at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
Target: x86-65
tls_shared_gnu2_test failed on CET enabled Tiger Lake machine when binutils is
compiled with -fcf-protection:
Dump of assembler code for function _Z2t1v:
0x00007ffff77c4d10 <+0>: endbr64
0x00007ffff77c4d14 <+4>: sub $0x8,%rsp
0x00007ffff77c4d18 <+8>: lea 0x22f9(%rip),%rax #
0x7ffff77c7018
<v...@got.plt>
0x00007ffff77c4d1f <+15>: call *(%rax)
=> 0x00007ffff77c4d21 <+17>: add %fs:0x0,%rax
Gold resolves v...@got.plt in
0000000000000000 <_Z2t1v>:
0: f3 0f 1e fa endbr64
4: 48 83 ec 08 sub $0x8,%rsp
8: 48 8d 05 00 00 00 00 lea 0x0(%rip),%rax # f <_Z2t1v+0xf>
b: R_X86_64_GOTPC32_TLSDESC v1-0x4
f: ff 10 call *(%rax) f: R_X86_64_TLSDESC_CALL
v1
to the first entry of PLT without endbr64
(gdb) disass 0x00007ffff77c4c10,+16
Dump of assembler code from 0x7ffff77c4c10 to 0x7ffff77c4c20:
=> 0x00007ffff77c4c10: push 0x23da(%rip) # 0x7ffff77c6ff0
<_GLOBAL_OFF
SET_TABLE_+8>
0x00007ffff77c4c16: bnd jmp *0x23c3(%rip) # 0x7ffff77c6fe0
0x00007ffff77c4c1d: nopl (%rax)
End of assembler dump.
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff77c4c10 in ?? () from ./tls_test_gnu2_shared.so
(gdb) bt
#0 0x00007ffff77c4c10 in ?? () from ./tls_test_gnu2_shared.so
#1 0x00007ffff77c4d21 in t1 ()
at /export/gnu/import/git/gitlab/x86-binutils/gold/testsuite/tls_test.cc:87
#2 0x000000000040121f in thread_routine (arg=arg@entry=0x0)
at
/export/gnu/import/git/gitlab/x86-binutils/gold/testsuite/tls_test_main.c
c:87
#3 0x0000000000400ebf in main ()
at
/export/gnu/import/git/gitlab/x86-binutils/gold/testsuite/tls_test_main.c
c:122
(gdb)
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