glibc/sysdeps/aarch64/tst-audit27.c

65 lines
2.0 KiB
C
Raw Normal View History

elf: Fix runtime linker auditing on aarch64 (BZ #26643) 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 ce9a68c57c260c8417afc93972849ac9ad243ec4) Resolved conflicts: NEWS elf/rtld.c
2022-01-24 13:46:18 +00:00
/* Check LD_AUDIT for aarch64 ABI specifics.
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 <array_length.h>
#include <string.h>
#include <support/check.h>
#include "tst-audit27mod.h"
int
do_test (void)
{
{
float r = tst_audit27_func_float (FUNC_FLOAT_ARG0, FUNC_FLOAT_ARG1,
FUNC_FLOAT_ARG2, FUNC_FLOAT_ARG3,
FUNC_FLOAT_ARG4, FUNC_FLOAT_ARG5,
FUNC_FLOAT_ARG6, FUNC_FLOAT_ARG7);
if (r != FUNC_FLOAT_RET)
FAIL_EXIT1 ("tst_audit27_func_float() returned %a, expected %a",
r, FUNC_FLOAT_RET);
}
{
double r = tst_audit27_func_double (FUNC_DOUBLE_ARG0, FUNC_DOUBLE_ARG1,
FUNC_DOUBLE_ARG2, FUNC_DOUBLE_ARG3,
FUNC_DOUBLE_ARG4, FUNC_DOUBLE_ARG5,
FUNC_DOUBLE_ARG6, FUNC_DOUBLE_ARG7);
if (r != FUNC_DOUBLE_RET)
FAIL_EXIT1 ("tst_audit27_func_double() returned %la, expected %la",
r, FUNC_DOUBLE_RET);
}
{
long double r = tst_audit27_func_ldouble (FUNC_LDOUBLE_ARG0,
FUNC_LDOUBLE_ARG1,
FUNC_LDOUBLE_ARG2,
FUNC_LDOUBLE_ARG3,
FUNC_LDOUBLE_ARG4,
FUNC_LDOUBLE_ARG5,
FUNC_LDOUBLE_ARG6,
FUNC_LDOUBLE_ARG7);
if (r != FUNC_LDOUBLE_RET)
FAIL_EXIT1 ("tst_audit27_func_ldouble() returned %La, expected %La",
r, FUNC_LDOUBLE_RET);
}
return 0;
}
#include <support/test-driver.c>