glibc/sysdeps/x86/dl-prop.h
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 02:43:31 -07:00

196 lines
5.3 KiB
C

/* Support for GNU properties. x86 version.
Copyright (C) 2018-2019 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/>. */
#ifndef _DL_PROP_H
#define _DL_PROP_H
#include <not-cancel.h>
extern void _dl_cet_check (struct link_map *, const char *)
attribute_hidden;
extern void _dl_cet_open_check (struct link_map *)
attribute_hidden;
static inline void __attribute__ ((always_inline))
_rtld_main_check (struct link_map *m, const char *program)
{
#if CET_ENABLED
_dl_cet_check (m, program);
#endif
}
static inline void __attribute__ ((always_inline))
_dl_open_check (struct link_map *m)
{
#if CET_ENABLED
_dl_cet_open_check (m);
#endif
}
static inline void __attribute__ ((unused))
_dl_process_cet_property_note (struct link_map *l,
const ElfW(Nhdr) *note,
const ElfW(Addr) size,
const ElfW(Addr) align)
{
#if CET_ENABLED
/* Skip if we have seen a NT_GNU_PROPERTY_TYPE_0 note before. */
if (l->l_cet != lc_unknown)
return;
/* The NT_GNU_PROPERTY_TYPE_0 note must be aliged to 4 bytes in
32-bit objects and to 8 bytes in 64-bit objects. Skip notes
with incorrect alignment. */
if (align != (__ELF_NATIVE_CLASS / 8))
return;
const ElfW(Addr) start = (ElfW(Addr)) note;
unsigned int feature_1 = 0;
unsigned int last_type = 0;
while ((ElfW(Addr)) (note + 1) - start < size)
{
/* Find the NT_GNU_PROPERTY_TYPE_0 note. */
if (note->n_namesz == 4
&& note->n_type == NT_GNU_PROPERTY_TYPE_0
&& memcmp (note + 1, "GNU", 4) == 0)
{
/* Stop if we see more than one GNU property note which may
be generated by the older linker. */
if (l->l_cet != lc_unknown)
return;
/* Check CET status now. */
l->l_cet = lc_none;
/* Check for invalid property. */
if (note->n_descsz < 8
|| (note->n_descsz % sizeof (ElfW(Addr))) != 0)
return;
/* Start and end of property array. */
unsigned char *ptr = (unsigned char *) (note + 1) + 4;
unsigned char *ptr_end = ptr + note->n_descsz;
do
{
unsigned int type = *(unsigned int *) ptr;
unsigned int datasz = *(unsigned int *) (ptr + 4);
/* Property type must be in ascending order. */
if (type < last_type)
return;
ptr += 8;
if ((ptr + datasz) > ptr_end)
return;
last_type = type;
if (type == GNU_PROPERTY_X86_FEATURE_1_AND)
{
/* The size of GNU_PROPERTY_X86_FEATURE_1_AND is 4
bytes. When seeing GNU_PROPERTY_X86_FEATURE_1_AND,
we stop the search regardless if its size is correct
or not. There is no point to continue if this note
is ill-formed. */
if (datasz != 4)
return;
feature_1 = *(unsigned int *) ptr;
/* Keep searching for the next GNU property note
generated by the older linker. */
break;
}
else if (type > GNU_PROPERTY_X86_FEATURE_1_AND)
{
/* Stop since property type is in ascending order. */
return;
}
/* Check the next property item. */
ptr += ALIGN_UP (datasz, sizeof (ElfW(Addr)));
}
while ((ptr_end - ptr) >= 8);
}
/* NB: Note sections like .note.ABI-tag and .note.gnu.build-id are
aligned to 4 bytes in 64-bit ELF objects. */
note = ((const void *) note
+ ELF_NOTE_NEXT_OFFSET (note->n_namesz, note->n_descsz,
align));
}
/* We get here only if there is one or no GNU property note. */
if ((feature_1 & GNU_PROPERTY_X86_FEATURE_1_IBT))
l->l_cet |= lc_ibt;
if ((feature_1 & GNU_PROPERTY_X86_FEATURE_1_SHSTK))
l->l_cet |= lc_shstk;
#endif
}
#ifdef FILEBUF_SIZE
static inline int __attribute__ ((unused))
_dl_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph,
int fd, struct filebuf *fbp)
{
# if CET_ENABLED
const ElfW(Nhdr) *note;
ElfW(Nhdr) *note_malloced = NULL;
ElfW(Addr) size = ph->p_filesz;
if (ph->p_offset + size <= (size_t) fbp->len)
note = (const void *) (fbp->buf + ph->p_offset);
else
{
if (size < __MAX_ALLOCA_CUTOFF)
note = alloca (size);
else
{
note_malloced = malloc (size);
note = note_malloced;
}
__lseek (fd, ph->p_offset, SEEK_SET);
if (__read_nocancel (fd, (void *) note, size) != size)
{
if (note_malloced)
free (note_malloced);
return -1;
}
}
_dl_process_cet_property_note (l, note, size, ph->p_align);
if (note_malloced)
free (note_malloced);
# endif
return 0;
}
#endif
static inline int __attribute__ ((unused))
_rtld_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph)
{
const ElfW(Nhdr) *note = (const void *) (ph->p_vaddr + l->l_addr);
_dl_process_cet_property_note (l, note, ph->p_memsz, ph->p_align);
return 0;
}
#endif /* _DL_PROP_H */