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authorRoland McGrath <roland@gnu.org>1996-06-21 21:37:08 +0000
committerRoland McGrath <roland@gnu.org>1996-06-21 21:37:08 +0000
commit0d3726c3fb54d21126a030c445dc2a5245afaacd (patch)
tree2c9c31dd582e02ed79cab922280679c6bc53eb9e /elf
parent4f54cdb1dd4b8929231f42e22b79a0d5c7600cba (diff)
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* elf/dl-load.c (_dl_map_object_from_fd): Fix mapping and l_phdrcvs/libc-960622
guessing to not assume p_vaddr of first load cmd is zero.
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-load.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c
index f655fdacef..1e0db77c55 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -278,7 +278,7 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
unallocated. Then jump into the normal segment-mapping loop to
handle the portion of the segment past the end of the file
mapping. */
- __mprotect (mapat + c->mapend,
+ __mprotect ((caddr_t) (l->l_addr + c->mapend),
loadcmds[nloadcmds - 1].allocend - c->mapend,
0);
goto postmap;
@@ -337,6 +337,20 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
++c;
}
+
+ if (l->l_phdr == 0)
+ {
+ /* 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, and that the first load command starts at the
+ beginning of the file and thus contains the ELF file header. */
+ ElfW(Addr) bof = l->l_addr + loadcmds[0].mapstart;
+ assert (loadcmds[0].mapoff == 0);
+ l->l_phdr = (void *) (bof + ((const ElfW(Ehdr) *) bof)->e_phoff);
+ }
+ else
+ /* Adjust the PT_PHDR value by the runtime load address. */
+ (ElfW(Addr)) l->l_phdr += l->l_addr;
}
/* We are done mapping in the file. We no longer need the descriptor. */
@@ -353,10 +367,6 @@ _dl_map_object_from_fd (const char *name, int fd, char *realname,
else
(ElfW(Addr)) l->l_ld += l->l_addr;
- if (l->l_phdr == 0)
- l->l_phdr = (void *) ((const ElfW(Ehdr) *) l->l_addr)->e_phoff;
- (ElfW(Addr)) l->l_phdr += l->l_addr;
-
l->l_entry += l->l_addr;
elf_get_dynamic_info (l->l_ld, l->l_info);