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7fc03cf320
Continuing the fixes for linknamespace and localplt test failures with -Os that arise from functions not being inlined in that case, this patch fixes such failures for feof_unlocked. The usual approach is followed of adding __feof_unlocked (inlined when feof_unlocked is), making calls use it when required for namespace reasons, and using libc_hidden_proto / libc_hidden_weak for the feof_unlocked weak alias when only localplt but not namespace issues are involved. In the case of getaddrinfo.c, use of __feof_unlocked needs to be conditional since that code is also used in nscd (where __feof_unlocked is not available). Tested for x86_64 (both without -Os to make sure that case continues to work, and with -Os to make sure all the relevant linknamespace and localplt test failures are resolved). Because of other such failures that remain after this patch, neither of the bugs can yet be closed. [BZ #15105] [BZ #19463] * libio/feof_u.c (feof_unlocked): Rename to __feof_unlocked and define as weak alias of __feof_unlocked. Use libc_hidden_weak. * include/stdio.h (feof_unlocked): Use libc_hidden_proto. (__feof_unlocked): New declaration, and inline function if [__USE_EXTERN_INLINES]. * iconv/gconv_conf.c (read_conf_file): Call __feof_unlocked instead of feof_unlocked. * intl/localealias.c [_LIBC] (FEOF): Likewise. * nss/nsswitch.c (nss_parse_file): Likewise. * sysdeps/unix/sysv/linux/readonly-area.c (__readonly_area): Likewise. * time/getdate.c (__getdate_r): Likewise. * sysdeps/posix/getaddrinfo.c [IS_IN (libc)] (feof_unlocked): Define as macro to call __feof_unlocked.
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/* Copyright (C) 2004-2018 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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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libio/libioP.h"
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/* Return 1 if the whole area PTR .. PTR+SIZE is not writable.
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Return -1 if it is writable. */
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int
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__readonly_area (const char *ptr, size_t size)
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{
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const void *ptr_end = ptr + size;
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FILE *fp = fopen ("/proc/self/maps", "rce");
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if (fp == NULL)
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{
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/* It is the system administrator's choice to not have /proc
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available to this process (e.g., because it runs in a chroot
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environment. Don't fail in this case. */
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if (errno == ENOENT
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/* The kernel has a bug in that a process is denied access
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to the /proc filesystem if it is set[ug]id. There has
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been no willingness to change this in the kernel so
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far. */
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|| errno == EACCES)
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return 1;
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return -1;
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}
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/* We need no locking. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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char *line = NULL;
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size_t linelen = 0;
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while (! __feof_unlocked (fp))
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{
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if (_IO_getdelim (&line, &linelen, '\n', fp) <= 0)
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break;
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char *p;
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uintptr_t from = strtoul (line, &p, 16);
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if (p == line || *p++ != '-')
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break;
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char *q;
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uintptr_t to = strtoul (p, &q, 16);
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if (q == p || *q++ != ' ')
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break;
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if (from < (uintptr_t) ptr_end && to > (uintptr_t) ptr)
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{
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/* Found an entry that at least partially covers the area. */
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if (*q++ != 'r' || *q++ != '-')
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break;
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if (from <= (uintptr_t) ptr && to >= (uintptr_t) ptr_end)
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{
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size = 0;
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break;
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}
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else if (from <= (uintptr_t) ptr)
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size -= to - (uintptr_t) ptr;
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else if (to >= (uintptr_t) ptr_end)
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size -= (uintptr_t) ptr_end - from;
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else
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size -= to - from;
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if (!size)
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break;
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}
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}
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fclose (fp);
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free (line);
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/* If the whole area between ptr and ptr_end is covered by read-only
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VMAs, return 1. Otherwise return -1. */
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return size == 0 ? 1 : -1;
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}
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