111 lines
3.7 KiB
Diff
111 lines
3.7 KiB
Diff
Short description: Work ld.so --verify crash on debuginfo files.
|
|
Author(s): Fedora glibc team <glibc@lists.fedoraproject.org>
|
|
Origin: PATCH
|
|
Bug-RHEL: #741105, #767146
|
|
Upstream status: not-needed
|
|
|
|
This change is designed to work around running ld.so on a debuginfo
|
|
file. This is the wrong fix for this problem and should be dropped.
|
|
The correct solution is to mark debuginfo files as new types of
|
|
ELF files.
|
|
|
|
diff --git a/elf/dl-load.c b/elf/dl-load.c
|
|
index 24e2819345995bd9..007121144e71d9cf 100644
|
|
--- a/elf/dl-load.c
|
|
+++ b/elf/dl-load.c
|
|
@@ -880,6 +880,18 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
|
in this information for the executable in case of an explicit
|
|
loader invocation. */
|
|
struct r_file_id id;
|
|
+ struct stat64 st;
|
|
+
|
|
+ if (__glibc_unlikely (!_dl_get_file_id (fd, &id, &st)))
|
|
+ {
|
|
+ errstring = N_("cannot stat shared object");
|
|
+ call_lose_errno:
|
|
+ errval = errno;
|
|
+ call_lose:
|
|
+ lose (errval, fd, name, realname, l, errstring,
|
|
+ make_consistent ? r : NULL, nsid);
|
|
+ }
|
|
+
|
|
if (mode & __RTLD_OPENEXEC)
|
|
{
|
|
assert (nsid == LM_ID_BASE);
|
|
@@ -887,16 +899,6 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
|
}
|
|
else
|
|
{
|
|
- if (__glibc_unlikely (!_dl_get_file_id (fd, &id)))
|
|
- {
|
|
- errstring = N_("cannot stat shared object");
|
|
- call_lose_errno:
|
|
- errval = errno;
|
|
- call_lose:
|
|
- lose (errval, fd, name, realname, l, errstring,
|
|
- make_consistent ? r : NULL, nsid);
|
|
- }
|
|
-
|
|
/* Look again to see if the real name matched another already loaded. */
|
|
for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
|
|
if (!l->l_removed && _dl_file_id_match_p (&l->l_file_id, &id))
|
|
@@ -1074,6 +1076,16 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
|
|
= N_("ELF load command address/offset not properly aligned");
|
|
goto call_lose;
|
|
}
|
|
+ if (__glibc_unlikely (ph->p_offset + ph->p_filesz > st.st_size))
|
|
+ {
|
|
+ /* If the segment requires zeroing of part of its last
|
|
+ page, we'll crash when accessing the unmapped page.
|
|
+ There's still a possibility of a race, if the shared
|
|
+ object is truncated between the fxstat above and the
|
|
+ memset below. */
|
|
+ errstring = N_("ELF load command past end of file");
|
|
+ goto call_lose;
|
|
+ }
|
|
|
|
struct loadcmd *c = &loadcmds[nloadcmds++];
|
|
c->mapstart = ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize));
|
|
diff --git a/sysdeps/generic/dl-fileid.h b/sysdeps/generic/dl-fileid.h
|
|
index 6310d46c2a6efc60..209580b6c0b8524b 100644
|
|
--- a/sysdeps/generic/dl-fileid.h
|
|
+++ b/sysdeps/generic/dl-fileid.h
|
|
@@ -29,7 +29,8 @@ struct r_file_id
|
|
On error, returns false, with errno set. */
|
|
static inline bool
|
|
_dl_get_file_id (int fd __attribute__ ((unused)),
|
|
- struct r_file_id *id __attribute__ ((unused)))
|
|
+ struct r_file_id *id __attribute__ ((unused)),
|
|
+ struct stat64_t *st __attribute__((unused)))
|
|
{
|
|
return true;
|
|
}
|
|
diff --git a/sysdeps/posix/dl-fileid.h b/sysdeps/posix/dl-fileid.h
|
|
index ae88a350788a5999..baa17b90a292a4d9 100644
|
|
--- a/sysdeps/posix/dl-fileid.h
|
|
+++ b/sysdeps/posix/dl-fileid.h
|
|
@@ -27,18 +27,16 @@ struct r_file_id
|
|
ino64_t ino;
|
|
};
|
|
|
|
-/* Sample FD to fill in *ID. Returns true on success.
|
|
+/* Sample FD to fill in *ID and *ST. Returns true on success.
|
|
On error, returns false, with errno set. */
|
|
static inline bool
|
|
-_dl_get_file_id (int fd, struct r_file_id *id)
|
|
+_dl_get_file_id (int fd, struct r_file_id *id, struct stat64 *st)
|
|
{
|
|
- struct stat64 st;
|
|
-
|
|
- if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, &st) < 0))
|
|
+ if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, st) < 0))
|
|
return false;
|
|
|
|
- id->dev = st.st_dev;
|
|
- id->ino = st.st_ino;
|
|
+ id->dev = st->st_dev;
|
|
+ id->ino = st->st_ino;
|
|
return true;
|
|
}
|
|
|