https://sourceware.org/bugzilla/show_bug.cgi?id=29851
Bug ID: 29851
Summary: -Wl,-z,ibtplt emits MPX jumps
Product: binutils
Version: 2.40 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: mliska at suse dot cz
CC: hjl.tools at gmail dot com
Target Milestone: ---
I would like to remove the support for -Wl,-z,bndplt as MPX extension is
outdated and unused. However, I noticed that -Wl,-z,ibtplt emits 'bnd jmp' and
I'm curious if it's correct or not?
$ cat a.c
#include <string.h>
int main(int argc, char **argv)
{
return strcmp (argv[0], "pes") == 0;
}
$ gcc-12 -shared a.c -fPIC -o libfoo.so -Wl,-z,ibtplt && objdump -d libfoo.so |
less
...
0000000000001050 <strcmp@plt>:
1050: f3 0f 1e fa endbr64
1054: f2 ff 25 7d 2f 00 00 bnd jmp *0x2f7d(%rip) # 3fd8
<strcmp@GLIBC_2.2.5>
105b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
Is it correct instruction that is used?
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