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(MAP_FILE): Define to zero if undefined. (MAP_COPY): Define to MAP_PRIVATE if undefined. (_dl_map_object_from_fd): Don't use MAP_INHERIT in mmap calls. If file it ET_EXEC, set its l_type to lt_executable.

This commit is contained in:
Roland McGrath 1995-12-12 01:07:35 +00:00
parent d72d8b1328
commit 9b8a44cd18
1 changed files with 23 additions and 3 deletions
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26
elf/dl-load.c
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@ -28,6 +28,23 @@ Cambridge, MA 02139, USA. */
#include "dynamic-link.h"
/* On some systems, no flag bits are given to specify file mapping. */
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
/* The right way to map in the shared library files is MAP_COPY, which
makes a virtual copy of the data at the time of the mmap call; this
guarantees the mapped pages will be consistent even if the file is
overwritten. Some losing VM systems like Linux's lack MAP_COPY. All we
get is MAP_PRIVATE, which copies each page when it is modified; this
means if the file is overwritten, we may at some point get some pages
from the new version after starting with pages from the old version. */
#ifndef MAP_COPY
#define MAP_COPY MAP_PRIVATE
#endif
#include <endian.h>
#if BYTE_ORDER == BIG_ENDIAN
#define byteorder ELFDATA2MSB
@ -182,7 +199,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname)
int prot, int fixed, off_t offset)
{
caddr_t mapat = mmap ((caddr_t) mapstart, len, prot,
fixed|MAP_COPY|MAP_FILE|MAP_INHERIT,
fixed|MAP_COPY|MAP_FILE,
fd, offset);
if (mapat == (caddr_t) -1)
lose (errno, "failed to map segment from shared object");
@ -390,10 +407,10 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname)
/* Map the remaining zero pages in from the zero fill FD. */
caddr_t mapat;
mapat = mmap ((caddr_t) zeropage, zeroend - zeropage, c->prot,
MAP_ANON|MAP_PRIVATE|MAP_FIXED|MAP_INHERIT,
MAP_ANON|MAP_PRIVATE|MAP_FIXED,
_dl_zerofd, 0);
if (mapat == (caddr_t) -1)
lose (errno, "cannot map zero pages");
lose (errno, "cannot map zero-fill pages");
}
}
@ -401,6 +418,9 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname)
}
}
if (type == ET_EXEC)
l->l_type = lt_executable;
if (l->l_ld == 0)
{
if (type == ET_DYN)