mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 21:40:12 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* AArch64 BTI functions.
|
|
Copyright (C) 2020-2021 Free Software Foundation, Inc.
|
|
|
|
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 <unistd.h>
|
|
#include <errno.h>
|
|
#include <libintl.h>
|
|
#include <ldsodefs.h>
|
|
#include <sys/mman.h>
|
|
|
|
/* See elf/dl-load.h. */
|
|
#ifndef MAP_COPY
|
|
# define MAP_COPY (MAP_PRIVATE | MAP_DENYWRITE)
|
|
#endif
|
|
|
|
/* Enable BTI protection for MAP. */
|
|
|
|
void
|
|
_dl_bti_protect (struct link_map *map, int fd)
|
|
{
|
|
const size_t pagesz = GLRO(dl_pagesize);
|
|
const ElfW(Phdr) *phdr;
|
|
|
|
for (phdr = map->l_phdr; phdr < &map->l_phdr[map->l_phnum]; ++phdr)
|
|
if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
|
|
{
|
|
size_t vstart = ALIGN_DOWN (phdr->p_vaddr, pagesz);
|
|
size_t vend = ALIGN_UP (phdr->p_vaddr + phdr->p_filesz, pagesz);
|
|
off_t off = ALIGN_DOWN (phdr->p_offset, pagesz);
|
|
void *start = (void *) (vstart + map->l_addr);
|
|
size_t len = vend - vstart;
|
|
|
|
unsigned prot = PROT_EXEC | PROT_BTI;
|
|
if (phdr->p_flags & PF_R)
|
|
prot |= PROT_READ;
|
|
if (phdr->p_flags & PF_W)
|
|
prot |= PROT_WRITE;
|
|
|
|
if (fd == -1)
|
|
/* Ignore failures for kernel mapped binaries. */
|
|
__mprotect (start, len, prot);
|
|
else
|
|
map->l_mach.bti_fail = __mmap (start, len, prot,
|
|
MAP_FIXED|MAP_COPY|MAP_FILE,
|
|
fd, off) == MAP_FAILED;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
bti_failed (struct link_map *l, const char *program)
|
|
{
|
|
if (program)
|
|
_dl_fatal_printf ("%s: %s: failed to turn on BTI protection\n",
|
|
program, l->l_name);
|
|
else
|
|
/* Note: the errno value is not available any more. */
|
|
_dl_signal_error (0, l->l_name, "dlopen",
|
|
N_("failed to turn on BTI protection"));
|
|
}
|
|
|
|
|
|
/* Enable BTI for L and its dependencies. */
|
|
|
|
void
|
|
_dl_bti_check (struct link_map *l, const char *program)
|
|
{
|
|
if (!GLRO(dl_aarch64_cpu_features).bti)
|
|
return;
|
|
|
|
if (l->l_mach.bti_fail)
|
|
bti_failed (l, program);
|
|
|
|
unsigned int i = l->l_searchlist.r_nlist;
|
|
while (i-- > 0)
|
|
{
|
|
struct link_map *dep = l->l_initfini[i];
|
|
if (dep->l_mach.bti_fail)
|
|
bti_failed (dep, program);
|
|
}
|
|
}
|