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Don't use broken DL_AUTO_FUNCTION_ADDRESS()

Browse Source 
On hppa and ia64, the macro DL_AUTO_FUNCTION_ADDRESS() uses the
variable fptr[2] in it's own scope.

The content of fptr[] is thus undefined right after the macro exits.
Newer gcc's (>= 4.7) reuse the stack space of this variable triggering
a segmentation fault in dl-init.c:69.

To fix this we rewrite the macros to make the call directly to init
and fini without needing to pass back a constructed function pointer.
This commit is contained in:
Guy Martin 2013-11-21 13:23:16 -05:00 committed by Carlos O'Donell
parent d33cafadfe
commit daf75146de
11 changed files with 94 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ChangeLog
View File

@ -1,3 +1,12 @@
2013-11-21 Guy Martin <gmsoft@tuxicoman.be>
* sysdeps/generic/ldsodefs.h: Replace DL_DT_INIT_ADDRESS() and
DL_DT_FINI_ADDRESS() macro with DL_CALL_DT_INIT() and
DL_CALL_DT_FINI() that call the functions directly.
* elf/dl-init.c: Use the new DL_CALL_DT_INIT() macro.
* elf/dl-close.c: Use the new DL_CALL_DT_FINI() macro.
* elf/dl-fini.c: Likewise.
2013-11-20 Ondřej Bílka <neleai@seznam.cz>
* malloc/hooks.c (memalign_check): Add alignment rounding.

5
elf/dl-close.c
View File

@ -274,9 +274,8 @@ _dl_close_worker (struct link_map *map)
/* Next try the old-style destructor. */
if (imap->l_info[DT_FINI] != NULL)
(*(void (*) (void)) DL_DT_FINI_ADDRESS
(imap, ((void *) imap->l_addr
+ imap->l_info[DT_FINI]->d_un.d_ptr))) ();
DL_CALL_DT_FINI (imap, ((void *) imap->l_addr
+ imap->l_info[DT_FINI]->d_un.d_ptr));
}
#ifdef SHARED

2
elf/dl-fini.c
View File

@ -254,7 +254,7 @@ _dl_fini (void)
/* Next try the old-style destructor. */
if (l->l_info[DT_FINI] != NULL)
((fini_t) DL_DT_FINI_ADDRESS (l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
DL_CALL_DT_FINI(l, l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr);
}
#ifdef SHARED

8
elf/dl-init.c
View File

@ -61,13 +61,7 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
- the others in the DT_INIT_ARRAY.
*/
if (l->l_info[DT_INIT] != NULL)
{
init_t init = (init_t) DL_DT_INIT_ADDRESS
(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr);
/* Call the function. */
init (argc, argv, env);
}
DL_CALL_DT_INIT(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr, argc, argv, env);
/* Next see whether there is an array with initialization functions. */
ElfW(Dyn) *init_array = l->l_info[DT_INIT_ARRAY];

9
ports/ChangeLog.hppa
View File

@ -1,3 +1,12 @@
2013-11-21 Guy Martin <gmsoft@tuxicoman.be>
* sysdeps/hppa/dl-lookupcfg.h: Remove obsolete
DL_DT_INIT_ADDRESS() and DL_DT_FINI_ADDRESS() macro and implement
DL_CALL_DT_INIT() as well as DL_CALL_DT_FINI().
Define DL_DT_FUNCTION_ADDRESS().
* sysdeps/hppa/dl-machine.h: Update ELF_MACHINE_START_ADDRESS()
to use DL_DT_FUNCTION_ADDRESS().
2013-10-30 Mike Frysinger <vapier@gentoo.org>
* sysdeps/hppa/configure.in: Moved to ...

9
ports/ChangeLog.ia64
View File

@ -1,3 +1,12 @@
2013-11-21 Guy Martin <gmsoft@tuxicoman.be>
* sysdeps/ia64/dl-lookupcfg.h: Remove obsolete
DL_DT_INIT_ADDRESS() and DL_DT_FINI_ADDRESS() macro and implement
DL_CALL_DT_INIT() as well as DL_CALL_DT_FINI().
Define DL_DT_FUNCTION_ADDRESS().
* sysdeps/ia64/dl-machine.h: Update ELF_MACHINE_START_ADDRESS()
to use DL_DT_FUNCTION_ADDRESS().
2013-10-30 Mike Frysinger <vapier@gentoo.org>
* sysdeps/ia64/configure.in: Moved to ...

52
ports/sysdeps/hppa/dl-lookupcfg.h
View File

@ -38,32 +38,36 @@ void _dl_unmap (struct link_map *map);
#define DL_UNMAP(map) _dl_unmap (map)
#define DL_AUTO_FUNCTION_ADDRESS(map, addr) \
({ \
unsigned int fptr[2]; \
fptr[0] = (unsigned int) (addr); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
/* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
(ElfW(Addr))((unsigned int)fptr | 2); \
})
#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
attr volatile unsigned int fptr[2]; \
/* The test for "start & 2" below is to accommodate old binaries which \
violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \
descriptor. */ \
if ((ElfW(Addr)) (start) & 2) \
addr = (ElfW(Addr)) start; \
else \
{ \
fptr[0] = (unsigned int) (start); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
/* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
addr = (ElfW(Addr))((unsigned int)fptr | 2); \
} \
#define DL_STATIC_FUNCTION_ADDRESS(map, addr) \
({ \
static unsigned int fptr[2]; \
fptr[0] = (unsigned int) (addr); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
/* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
(ElfW(Addr))((unsigned int)fptr | 2); \
})
#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
init_t init = (init_t) addr; \
init (argc, argv, env); \
}
/* The test for "addr & 2" below is to accommodate old binaries which
violated the ELF ABI by pointing DT_INIT and DT_FINI at a function
descriptor. */
#define DL_DT_INIT_ADDRESS(map, addr) \
((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))
#define DL_DT_FINI_ADDRESS(map, addr) \
((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))
#define DL_CALL_DT_FINI(map, start) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
fini_t fini = (fini_t) addr; \
fini (); \
}
/* The type of the return value of fixup/profile_fixup */
#define DL_FIXUP_VALUE_TYPE struct fdesc

8
ports/sysdeps/hppa/dl-machine.h
View File

@ -490,8 +490,12 @@ asm ( \
#define ELF_MACHINE_NO_REL 1
/* Return the address of the entry point. */
#define ELF_MACHINE_START_ADDRESS(map, start) \
DL_STATIC_FUNCTION_ADDRESS (map, start)
#define ELF_MACHINE_START_ADDRESS(map, start) \
({ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
addr; \
})
/* We define an initialization functions. This is called very early in
* _dl_sysdep_start. */

36
ports/sysdeps/ia64/dl-lookupcfg.h
View File

@ -39,24 +39,28 @@ extern void _dl_unmap (struct link_map *map);
#define DL_UNMAP(map) _dl_unmap (map)
#define DL_AUTO_FUNCTION_ADDRESS(map, addr) \
({ \
unsigned long int fptr[2]; \
fptr[0] = (unsigned long int) (addr); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
(Elf64_Addr) fptr; \
})
#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
attr volatile unsigned long int fptr[2]; \
fptr[0] = (unsigned long int) (start); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
addr = (ElfW(Addr)) fptr; \
#define DL_STATIC_FUNCTION_ADDRESS(map, addr) \
({ \
static unsigned long int fptr[2]; \
fptr[0] = (unsigned long int) (addr); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
(Elf64_Addr) fptr; \
})
#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
init_t init = (init_t) addr; \
init (argc, argv, env); \
}
#define DL_CALL_DT_FINI(map, start) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
fini_t fini = (fini_t) addr; \
fini (); \
}
#define DL_DT_INIT_ADDRESS(map, addr) DL_AUTO_FUNCTION_ADDRESS (map, addr)
#define DL_DT_FINI_ADDRESS(map, addr) DL_AUTO_FUNCTION_ADDRESS (map, addr)
/* The type of the return value of fixup/profile_fixup. */
#define DL_FIXUP_VALUE_TYPE struct fdesc
/* Construct a value of type DL_FIXUP_VALUE_TYPE from a code address

8
ports/sysdeps/ia64/dl-machine.h
View File

@ -322,8 +322,12 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
#define ELF_MACHINE_NO_REL 1
/* Return the address of the entry point. */
#define ELF_MACHINE_START_ADDRESS(map, start) \
DL_STATIC_FUNCTION_ADDRESS (map, start)
#define ELF_MACHINE_START_ADDRESS(map, start) \
({ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
addr; \
})
/* Fixup a PLT entry to bounce directly to the function at VALUE. */
static inline struct fdesc __attribute__ ((always_inline))

5
sysdeps/generic/ldsodefs.h
View File

@ -76,8 +76,9 @@ typedef struct link_map *lookup_t;
# define DL_SYMBOL_ADDRESS(map, ref) \
(void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
# define DL_DT_INIT_ADDRESS(map, start) (start)
# define DL_DT_FINI_ADDRESS(map, start) (start)
# define DL_CALL_DT_INIT(map, start, argc, argv, env) \
((init_t) (start)) (argc, argv, env)
# define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) ()
#endif
/* On some architectures dladdr can't use st_size of all symbols this way. */