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ce9a68c57c
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>
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Check LD_AUDIT for aarch64 specific ABI.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <link.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "tst-audit26mod.h"
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#define TEST_NAME "tst-audit26"
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#define AUDIT26_COOKIE 0
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unsigned int
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la_version (unsigned int v)
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{
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return v;
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}
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unsigned int
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la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
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{
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const char *p = strrchr (map->l_name, '/');
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const char *l_name = p == NULL ? map->l_name : p + 1;
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uintptr_t ck = -1;
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if (strncmp (l_name, TEST_NAME, strlen (TEST_NAME)) == 0)
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ck = AUDIT26_COOKIE;
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*cookie = ck;
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printf ("objopen: %ld, %s [cookie=%ld]\n", lmid, l_name, ck);
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return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
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}
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ElfW(Addr)
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la_aarch64_gnu_pltenter (ElfW(Sym) *sym __attribute__ ((unused)),
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unsigned int ndx __attribute__ ((unused)),
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uintptr_t *refcook, uintptr_t *defcook,
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La_aarch64_regs *regs, unsigned int *flags,
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const char *symname, long int *framesizep)
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{
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printf ("pltenter: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
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symname, (long int) sym->st_value, ndx, *flags);
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if (strcmp (symname, "tst_audit26_func") == 0)
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{
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assert (regs->lr_xreg[0] == ARG1);
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assert (regs->lr_xreg[1] == ARG2);
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assert (regs->lr_xreg[2] == ARG3);
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}
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else
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abort ();
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assert (regs->lr_vpcs == 0);
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/* Clobber 'x8'. */
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asm volatile ("mov x8, -1" : : : "x8");
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*framesizep = 1024;
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return sym->st_value;
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}
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unsigned int
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la_aarch64_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
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uintptr_t *defcook,
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const struct La_aarch64_regs *inregs,
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struct La_aarch64_retval *outregs, const char *symname)
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{
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printf ("pltexit: symname=%s, st_value=%#lx, ndx=%u\n",
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symname, (long int) sym->st_value, ndx);
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if (strcmp (symname, "tst_audit26_func") == 0)
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{
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assert (inregs->lr_xreg[0] == ARG1);
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assert (inregs->lr_xreg[1] == ARG2);
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assert (inregs->lr_xreg[2] == ARG3);
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}
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else
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abort ();
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assert (inregs->lr_vpcs == 0);
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assert (outregs->lrv_vpcs == 0);
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/* Clobber 'x8'. */
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asm volatile ("mov x8, -1" : : : "x8");
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return 0;
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}
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