+2013-06-24 Mike Frysinger <vapier@gentoo.org>
+
+ [BZ #10283]
+ * NEWS: Note fixing of BZ #10283.
+ * locale/locarchive.h (struct locarhandle): Add mmap_base and mmap_len.
+ * locale/programs/locarchive.c: Include libc-mmap.h.
+ (prepare_address_space): Take two new outputs (the mmap base and len).
+ Align p to MAP_FIXED_ALIGNMENT. Set mmap base and len to the right
+ values.
+ (create_archive): Declare new mmap base and len values for
+ prepare_address_space, and store the result in ah.
+ (file_data_available_p): Replace pagesz with MAP_FIXED_ALIGNMENT.
+ (enlarge_archive): If ah->mmap_base is not NULL, use that and
+ ah->mmap_len to unmap rather than ah->addr and ah->reserved.
+ Declare new mmap base and len values for
+ prepare_address_space, and store the result in new_ah.
+ (open_archive): Declare new mmap base and len values for
+ prepare_address_space, and store the result in ah.
+ (close_archive): If ah->mmap_base is not NULL, use that and
+ ah->mmap_len to unmap rather than ah->addr and ah->reserved.
+ * sysdeps/generic/libc-mmap.h: New file.
+
2013-06-24 Mike Frysinger <vapier@gentoo.org>
* include/libc-internal.h (ALIGN_DOWN): New helper macro.
* The following bugs are resolved with this release:
- 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10357, 10686, 11120, 11561,
- 12310, 12387, 12515, 12723, 13550, 13889, 13951, 13988, 14142, 14176,
- 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496, 14582, 14686,
- 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14952, 14964, 14981,
- 14982, 14985, 14991, 14994, 14996, 15000, 15003, 15006, 15007, 15014,
- 15020, 15023, 15036, 15054, 15055, 15062, 15078, 15084, 15085, 15086,
- 15100, 15160, 15214, 15221, 15232, 15234, 15283, 15285, 15287, 15304,
- 15305, 15307, 15309, 15327, 15330, 15335, 15336, 15337, 15339, 15342,
- 15346, 15359, 15361, 15366, 15380, 15381, 15394, 15395, 15405, 15406,
- 15409, 15416, 15418, 15419, 15423, 15424, 15426, 15429, 15431, 15432,
- 15441, 15442, 15448, 15465, 15480, 15485, 15488, 15490, 15492, 15493,
- 15497, 15506, 15529, 15536, 15553, 15577, 15583, 15618, 15627, 15631,
- 15654, 15655, 15667.
+ 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
+ 11561, 12310, 12387, 12515, 12723, 13550, 13889, 13951, 13988, 14142,
+ 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496, 14582,
+ 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14952, 14964,
+ 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003, 15006, 15007,
+ 15014, 15020, 15023, 15036, 15054, 15055, 15062, 15078, 15084, 15085,
+ 15086, 15100, 15160, 15214, 15221, 15232, 15234, 15283, 15285, 15287,
+ 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336, 15337, 15339,
+ 15342, 15346, 15359, 15361, 15366, 15380, 15381, 15394, 15395, 15405,
+ 15406, 15409, 15416, 15418, 15419, 15423, 15424, 15426, 15429, 15431,
+ 15432, 15441, 15442, 15448, 15465, 15480, 15485, 15488, 15490, 15492,
+ 15493, 15497, 15506, 15529, 15536, 15553, 15577, 15583, 15618, 15627,
+ 15631, 15654, 15655, 15667.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).
void *addr;
size_t mmaped;
size_t reserved;
+ /* If this mmap required adjustment (such as re-aligning), then this is the
+ real address that was returned from mmap and thus should be passed to the
+ munmap call. The addr field above is the first usable address. */
+ void *mmap_base;
+ /* Same as above for mmap_base vs addr, but this is the real length of the
+ map rather than the usable (which is what reserved represents). */
+ size_t mmap_len;
};
#include <stdint.h>
#include <sys/mman.h>
#include <sys/param.h>
+#include <sys/shm.h>
#include <sys/stat.h>
+#include <libc-mmap.h>
#include "../../crypt/md5.h"
#include "../localeinfo.h"
#include "../locarchive.h"
mapping affects the address selection. So do this mapping from the
actual file, even though it's only a dummy to reserve address space. */
static void *
-prepare_address_space (int fd, size_t total, size_t *reserved, int *xflags)
+prepare_address_space (int fd, size_t total, size_t *reserved, int *xflags,
+ void **mmap_base, size_t *mmap_len)
{
if (total < RESERVE_MMAP_SIZE)
{
void *p = mmap64 (NULL, RESERVE_MMAP_SIZE, PROT_NONE, MAP_SHARED, fd, 0);
if (p != MAP_FAILED)
- {
- *reserved = RESERVE_MMAP_SIZE;
- *xflags = MAP_FIXED;
- return p;
- }
+ {
+ void *aligned_p = PTR_ALIGN_UP (p, MAP_FIXED_ALIGNMENT);
+ size_t align_adjust = aligned_p - p;
+ *mmap_base = p;
+ *mmap_len = RESERVE_MMAP_SIZE;
+ assert (align_adjust < RESERVE_MMAP_SIZE);
+ *reserved = RESERVE_MMAP_SIZE - align_adjust;
+ *xflags = MAP_FIXED;
+ return aligned_p;
+ }
}
*reserved = total;
*xflags = 0;
+ *mmap_base = NULL;
+ *mmap_len = 0;
return NULL;
}
error (EXIT_FAILURE, errval, _("cannot resize archive file"));
}
- size_t reserved;
+ size_t reserved, mmap_len;
int xflags;
- void *p = prepare_address_space (fd, total, &reserved, &xflags);
+ void *mmap_base;
+ void *p = prepare_address_space (fd, total, &reserved, &xflags, &mmap_base,
+ &mmap_len);
/* Map the header and all the administration data structures. */
p = mmap64 (p, total, PROT_READ | PROT_WRITE, MAP_SHARED | xflags, fd, 0);
}
ah->fd = fd;
+ ah->mmap_base = mmap_base;
+ ah->mmap_len = mmap_len;
ah->addr = p;
ah->mmaped = total;
ah->reserved = reserved;
if (st.st_size > ah->reserved)
return false;
- const size_t pagesz = getpagesize ();
- size_t start = ah->mmaped & ~(pagesz - 1);
+ size_t start = ALIGN_DOWN (ah->mmaped, MAP_FIXED_ALIGNMENT);
void *p = mmap64 (ah->addr + start, st.st_size - start,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED,
ah->fd, start);
MAP_SHARED | MAP_FIXED, ah->fd, 0);
else
{
- munmap (ah->addr, ah->reserved);
+ if (ah->mmap_base)
+ munmap (ah->mmap_base, ah->mmap_len);
+ else
+ munmap (ah->addr, ah->reserved);
ah->addr = mmap64 (NULL, st.st_size, PROT_READ | PROT_WRITE,
MAP_SHARED, ah->fd, 0);
ah->reserved = st.st_size;
+ ah->mmap_base = NULL;
+ ah->mmap_len = 0;
head = ah->addr;
}
if (ah->addr == MAP_FAILED)
error (EXIT_FAILURE, errval, _("cannot resize archive file"));
}
- size_t reserved;
+ size_t reserved, mmap_len;
int xflags;
- void *p = prepare_address_space (fd, total, &reserved, &xflags);
+ void *mmap_base;
+ void *p = prepare_address_space (fd, total, &reserved, &xflags, &mmap_base,
+ &mmap_len);
/* Map the header and all the administration data structures. */
p = mmap64 (p, total, PROT_READ | PROT_WRITE, MAP_SHARED | xflags, fd, 0);
}
new_ah.mmaped = total;
+ new_ah.mmap_base = mmap_base;
+ new_ah.mmap_len = mmap_len;
new_ah.addr = p;
new_ah.fd = fd;
new_ah.reserved = reserved;
ah->fd = fd;
ah->mmaped = st.st_size;
- size_t reserved;
+ size_t reserved, mmap_len;
int xflags;
- void *p = prepare_address_space (fd, st.st_size, &reserved, &xflags);
+ void *mmap_base;
+ void *p = prepare_address_space (fd, st.st_size, &reserved, &xflags,
+ &mmap_base, &mmap_len);
/* Map the entire file. We might need to compare the category data
in the file with the newly added data. */
error (EXIT_FAILURE, errno, _("cannot map archive header"));
}
ah->reserved = reserved;
+ ah->mmap_base = mmap_base;
+ ah->mmap_len = mmap_len;
}
{
if (ah->fd != -1)
{
- munmap (ah->addr, ah->reserved);
+ if (ah->mmap_base)
+ munmap (ah->mmap_base, ah->mmap_len);
+ else
+ munmap (ah->addr, ah->reserved);
close (ah->fd);
}
}
--- /dev/null
+/* Internal logic for dealing with mmap quirks.
+ Copyright (C) 2013 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _LIBC_MMAP_H
+#define _LIBC_MMAP_H 1
+
+/* Using MAP_FIXED with mmap sometimes requires larger alignment. */
+#include <sys/shm.h>
+#define MAP_FIXED_ALIGNMENT SHMLBA
+
+#endif
projects / thirdparty / glibc.git / commitdiff
