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* elf/link.h (struct link_map): New field l_phdr_allocated.
	* elf/dl-load.c (_dl_map_object_from_fd): Don't depend on having
	the program header being part of any loaded segment.  If it is not
	allocate memory and set l_phdr_allocated flag.
	* elf/dl-close.c (_dl_close): Free l_phdr if necessary.
This commit is contained in:
Ulrich Drepper 1999-05-07 00:00:48 +00:00
parent 607c351a14
commit 7bcaca4384
4 changed files with 31 additions and 15 deletions
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6
ChangeLog
View File

@ -1,5 +1,11 @@
1999-05-06 Ulrich Drepper <drepper@cygnus.com>
* elf/link.h (struct link_map): New field l_phdr_allocated.
* elf/dl-load.c (_dl_map_object_from_fd): Don't depend on having
the program header being part of any loaded segment. If it is not
allocate memory and set l_phdr_allocated flag.
* elf/dl-close.c (_dl_close): Free l_phdr if necessary.
* nss/digits_dots.c: Correct return value interpretation of
inet_ntoa. Fix PR libc/1109.

3
elf/dl-close.c
View File

@ -165,6 +165,9 @@ _dl_close (struct link_map *map)
if (imap != map && imap->l_searchlist.r_list != NULL)
free (imap->l_searchlist.r_list);
if (imap->l_phdr_allocated)
free (imap->l_phdr);
free (imap);
}
}

34
elf/dl-load.c
View File

@ -917,6 +917,13 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
c->prot, MAP_FIXED, c->mapoff);
postmap:
if (l->l_phdr == 0
&& c->mapoff <= header->e_phoff
&& (c->mapend - c->mapstart + c->mapoff
>= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
/* Found the program header in this segment. */
l->l_phdr = (void *) (c->mapstart + header->e_phoff - c->mapoff);
if (c->allocend > c->dataend)
{
/* Extra zero pages should appear at the end of this segment,
@ -963,22 +970,19 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
++c;
}
if (l->l_phdr == 0)
if (l->l_phdr == NULL)
{
/* There was no PT_PHDR specified. We need to find the phdr in the
load image ourselves. We assume it is in fact in the load image
somewhere. */
for (c = loadcmds; c < &loadcmds[nloadcmds]; c++)
if (c->mapoff <= header->e_phoff
&& (c->mapend - c->mapstart + c->mapoff
>= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
{
ElfW(Addr) bof = l->l_addr + c->mapstart;
l->l_phdr = (void *) (bof + header->e_phoff - c->mapoff);
break;
}
if (l->l_phdr == 0)
LOSE (0, "program headers not contained in any loaded segment");
/* The program header is not contained in any of the segmenst.
We have to allocate memory ourself and copy it over from
out temporary place. */
ElfW(Phdr) *newp = (ElfW(Phdr) *) malloc (header->e_phnum
* sizeof (ElfW(Phdr)));
if (newp == NULL)
LOSE (ENOMEM, "cannot allocate memory for program header");
l->l_phdr = memcpy (newp, phdr,
(header->e_phnum * sizeof (ElfW(Phdr))));
l->l_phdr_allocated = 1;
}
else
/* Adjust the PT_PHDR value by the runtime load address. */

3
elf/link.h
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@ -199,6 +199,9 @@ struct link_map
object is the same as one already loaded. */
dev_t l_dev;
ino_t l_ino;
/* Nonzero if the data structure pointed to by `l_phdr' is allocated. */
int l_phdr_allocated;
};
#endif /* link.h */