|
Carlos O'Donell |
0e17ea |
Short description: Work ld.so --verify crash on debuginfo files.
|
|
Carlos O'Donell |
0e17ea |
Author(s): Fedora glibc team <glibc@lists.fedoraproject.org>
|
|
Carlos O'Donell |
0e17ea |
Origin: PATCH
|
|
Carlos O'Donell |
0e17ea |
Bug-RHEL: #741105, #767146
|
|
Carlos O'Donell |
0e17ea |
Upstream status: not-needed
|
|
Carlos O'Donell |
0e17ea |
|
|
Carlos O'Donell |
0e17ea |
This change is designed to work around running ld.so on a debuginfo
|
|
Carlos O'Donell |
0e17ea |
file. This is the wrong fix for this problem and should be dropped.
|
|
Carlos O'Donell |
0e17ea |
The correct solution is to mark debuginfo files as new types of
|
|
Carlos O'Donell |
0e17ea |
ELF files.
|
|
Carlos O'Donell |
0e17ea |
|
|
Carlos O'Donell |
e61b8f |
Index: glibc-2.22-386-g95e8397/elf/dl-load.c
|
|
Carlos O'Donell |
e61b8f |
===================================================================
|
|
Carlos O'Donell |
e61b8f |
--- glibc-2.22-386-g95e8397.orig/elf/dl-load.c
|
|
Carlos O'Donell |
e61b8f |
+++ glibc-2.22-386-g95e8397/elf/dl-load.c
|
|
Carlos O'Donell |
e61b8f |
@@ -881,7 +881,8 @@ _dl_map_object_from_fd (const char *name
|
|
Siddhesh Poyarekar |
6223db |
|
|
Siddhesh Poyarekar |
6223db |
/* Get file information. */
|
|
Siddhesh Poyarekar |
6223db |
struct r_file_id id;
|
|
Siddhesh Poyarekar |
6223db |
- if (__glibc_unlikely (!_dl_get_file_id (fd, &id)))
|
|
Siddhesh Poyarekar |
6223db |
+ struct stat64 st;
|
|
Siddhesh Poyarekar |
6223db |
+ if (__glibc_unlikely (!_dl_get_file_id (fd, &id, &st)))
|
|
Siddhesh Poyarekar |
6223db |
{
|
|
Siddhesh Poyarekar |
6223db |
errstring = N_("cannot stat shared object");
|
|
Siddhesh Poyarekar |
6223db |
call_lose_errno:
|
|
Carlos O'Donell |
e61b8f |
@@ -1076,6 +1077,16 @@ _dl_map_object_from_fd (const char *name
|
|
Jeff Law |
92f446 |
= N_("ELF load command address/offset not properly aligned");
|
|
Jeff Law |
92f446 |
goto call_lose;
|
|
Jeff Law |
92f446 |
}
|
|
Siddhesh Poyarekar |
c899b4 |
+ if (__glibc_unlikely (ph->p_offset + ph->p_filesz > st.st_size))
|
|
Jeff Law |
92f446 |
+ {
|
|
Jeff Law |
92f446 |
+ /* If the segment requires zeroing of part of its last
|
|
Jeff Law |
92f446 |
+ page, we'll crash when accessing the unmapped page.
|
|
Jeff Law |
92f446 |
+ There's still a possibility of a race, if the shared
|
|
Jeff Law |
92f446 |
+ object is truncated between the fxstat above and the
|
|
Jeff Law |
92f446 |
+ memset below. */
|
|
Jeff Law |
92f446 |
+ errstring = N_("ELF load command past end of file");
|
|
Jeff Law |
92f446 |
+ goto call_lose;
|
|
Jeff Law |
92f446 |
+ }
|
|
Jeff Law |
92f446 |
|
|
Siddhesh Poyarekar |
c899b4 |
struct loadcmd *c = &loadcmds[nloadcmds++];
|
|
Carlos O'Donell |
e61b8f |
c->mapstart = ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize));
|
|
Carlos O'Donell |
e61b8f |
Index: glibc-2.22-386-g95e8397/sysdeps/generic/dl-fileid.h
|
|
Carlos O'Donell |
e61b8f |
===================================================================
|
|
Carlos O'Donell |
e61b8f |
--- glibc-2.22-386-g95e8397.orig/sysdeps/generic/dl-fileid.h
|
|
Carlos O'Donell |
e61b8f |
+++ glibc-2.22-386-g95e8397/sysdeps/generic/dl-fileid.h
|
|
Siddhesh Poyarekar |
6223db |
@@ -29,7 +29,8 @@ struct r_file_id
|
|
Siddhesh Poyarekar |
6223db |
On error, returns false, with errno set. */
|
|
Siddhesh Poyarekar |
6223db |
static inline bool
|
|
Siddhesh Poyarekar |
6223db |
_dl_get_file_id (int fd __attribute__ ((unused)),
|
|
Siddhesh Poyarekar |
6223db |
- struct r_file_id *id __attribute__ ((unused)))
|
|
Siddhesh Poyarekar |
6223db |
+ struct r_file_id *id __attribute__ ((unused)),
|
|
Siddhesh Poyarekar |
6223db |
+ struct stat64_t *st __attribute__((unused)))
|
|
Siddhesh Poyarekar |
6223db |
{
|
|
Siddhesh Poyarekar |
6223db |
return true;
|
|
Siddhesh Poyarekar |
6223db |
}
|
|
Carlos O'Donell |
e61b8f |
Index: glibc-2.22-386-g95e8397/sysdeps/posix/dl-fileid.h
|
|
Carlos O'Donell |
e61b8f |
===================================================================
|
|
Carlos O'Donell |
e61b8f |
--- glibc-2.22-386-g95e8397.orig/sysdeps/posix/dl-fileid.h
|
|
Carlos O'Donell |
e61b8f |
+++ glibc-2.22-386-g95e8397/sysdeps/posix/dl-fileid.h
|
|
Siddhesh Poyarekar |
6223db |
@@ -27,18 +27,16 @@ struct r_file_id
|
|
Siddhesh Poyarekar |
6223db |
ino64_t ino;
|
|
Siddhesh Poyarekar |
6223db |
};
|
|
Siddhesh Poyarekar |
6223db |
|
|
Siddhesh Poyarekar |
6223db |
-/* Sample FD to fill in *ID. Returns true on success.
|
|
Siddhesh Poyarekar |
6223db |
+/* Sample FD to fill in *ID and *ST. Returns true on success.
|
|
Siddhesh Poyarekar |
6223db |
On error, returns false, with errno set. */
|
|
Siddhesh Poyarekar |
6223db |
static inline bool
|
|
Siddhesh Poyarekar |
6223db |
-_dl_get_file_id (int fd, struct r_file_id *id)
|
|
Siddhesh Poyarekar |
6223db |
+_dl_get_file_id (int fd, struct r_file_id *id, struct stat64 *st)
|
|
Siddhesh Poyarekar |
6223db |
{
|
|
Siddhesh Poyarekar |
6223db |
- struct stat64 st;
|
|
Siddhesh Poyarekar |
6223db |
-
|
|
Siddhesh Poyarekar |
6223db |
- if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, &st) < 0))
|
|
Siddhesh Poyarekar |
6223db |
+ if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, st) < 0))
|
|
Siddhesh Poyarekar |
6223db |
return false;
|
|
Siddhesh Poyarekar |
6223db |
|
|
Siddhesh Poyarekar |
6223db |
- id->dev = st.st_dev;
|
|
Siddhesh Poyarekar |
6223db |
- id->ino = st.st_ino;
|
|
Siddhesh Poyarekar |
6223db |
+ id->dev = st->st_dev;
|
|
Siddhesh Poyarekar |
6223db |
+ id->ino = st->st_ino;
|
|
Siddhesh Poyarekar |
6223db |
return true;
|
|
Siddhesh Poyarekar |
6223db |
}
|
|
Siddhesh Poyarekar |
6223db |
|