mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
b118bce87a
The rtld audit support show two problems on aarch64:
1. _dl_runtime_resolve does not preserve x8, the indirect result
location register, which might generate wrong result calls
depending of the function signature.
2. The NEON Q registers pushed onto the stack by _dl_runtime_resolve
were twice the size of D registers extracted from the stack frame by
_dl_runtime_profile.
While 2. might result in wrong information passed on the PLT tracing,
1. generates wrong runtime behaviour.
The aarch64 rtld audit support is changed to:
* Both La_aarch64_regs and La_aarch64_retval are expanded to include
both x8 and the full sized NEON V registers, as defined by the
ABI.
* dl_runtime_profile needed to extract registers saved by
_dl_runtime_resolve and put them into the new correctly sized
La_aarch64_regs structure.
* The LAV_CURRENT check is change to only accept new audit modules
to avoid the undefined behavior of not save/restore x8.
* Different than other architectures, audit modules older than
LAV_CURRENT are rejected (both La_aarch64_regs and La_aarch64_retval
changed their layout and there are no requirements to support multiple
audit interface with the inherent aarch64 issues).
* A new field is also reserved on both La_aarch64_regs and
La_aarch64_retval to support variant pcs symbols.
Similar to x86, a new La_aarch64_vector type to represent the NEON
register is added on the La_aarch64_regs (so each type can be accessed
directly).
Since LAV_CURRENT was already bumped to support bind-now, there is
no need to increase it again.
Checked on aarch64-linux-gnu.
Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit ce9a68c57c)
Resolved conflicts:
NEWS
elf/rtld.c
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Check LD_AUDIT for aarch64 specific ABI.
|
|
Copyright (C) 2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
#include <link.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "tst-audit26mod.h"
|
|
|
|
#define TEST_NAME "tst-audit26"
|
|
|
|
#define AUDIT26_COOKIE 0
|
|
|
|
unsigned int
|
|
la_version (unsigned int v)
|
|
{
|
|
return v;
|
|
}
|
|
|
|
unsigned int
|
|
la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
|
|
{
|
|
const char *p = strrchr (map->l_name, '/');
|
|
const char *l_name = p == NULL ? map->l_name : p + 1;
|
|
uintptr_t ck = -1;
|
|
if (strncmp (l_name, TEST_NAME, strlen (TEST_NAME)) == 0)
|
|
ck = AUDIT26_COOKIE;
|
|
*cookie = ck;
|
|
printf ("objopen: %ld, %s [cookie=%ld]\n", lmid, l_name, ck);
|
|
return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
|
|
}
|
|
|
|
ElfW(Addr)
|
|
la_aarch64_gnu_pltenter (ElfW(Sym) *sym __attribute__ ((unused)),
|
|
unsigned int ndx __attribute__ ((unused)),
|
|
uintptr_t *refcook, uintptr_t *defcook,
|
|
La_aarch64_regs *regs, unsigned int *flags,
|
|
const char *symname, long int *framesizep)
|
|
{
|
|
printf ("pltenter: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
|
|
symname, (long int) sym->st_value, ndx, *flags);
|
|
|
|
if (strcmp (symname, "tst_audit26_func") == 0)
|
|
{
|
|
assert (regs->lr_xreg[0] == ARG1);
|
|
assert (regs->lr_xreg[1] == ARG2);
|
|
assert (regs->lr_xreg[2] == ARG3);
|
|
}
|
|
else
|
|
abort ();
|
|
|
|
assert (regs->lr_vpcs == 0);
|
|
|
|
/* Clobber 'x8'. */
|
|
asm volatile ("mov x8, -1" : : : "x8");
|
|
|
|
*framesizep = 1024;
|
|
|
|
return sym->st_value;
|
|
}
|
|
|
|
unsigned int
|
|
la_aarch64_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
|
|
uintptr_t *defcook,
|
|
const struct La_aarch64_regs *inregs,
|
|
struct La_aarch64_retval *outregs, const char *symname)
|
|
{
|
|
printf ("pltexit: symname=%s, st_value=%#lx, ndx=%u\n",
|
|
symname, (long int) sym->st_value, ndx);
|
|
|
|
if (strcmp (symname, "tst_audit26_func") == 0)
|
|
{
|
|
assert (inregs->lr_xreg[0] == ARG1);
|
|
assert (inregs->lr_xreg[1] == ARG2);
|
|
assert (inregs->lr_xreg[2] == ARG3);
|
|
}
|
|
else
|
|
abort ();
|
|
|
|
assert (inregs->lr_vpcs == 0);
|
|
assert (outregs->lrv_vpcs == 0);
|
|
|
|
/* Clobber 'x8'. */
|
|
asm volatile ("mov x8, -1" : : : "x8");
|
|
|
|
return 0;
|
|
}
|