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authorUlrich Drepper <drepper@redhat.com>2007-06-19 22:59:48 +0000
committerUlrich Drepper <drepper@redhat.com>2007-06-19 22:59:48 +0000
commit9be09e060fcb211d3e53fc93098f57b74df2cb67 (patch)
tree4abc7be287b872bf34a7a88453e31d5186e88b1a
parentae1ad3aebbc397212b4bb2eec92ff19f8c1f913a (diff)
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* sysdeps/generic/ldsodefs.h (rtld_global): Reorder some elements
to fill in holes (rtld_global_ro): Likewise. 2007-06-18 Jakub Jelinek <jakub@redhat.com> * elf/dl-addr.c (_dl_addr): Skip PT_LOAD checking if l_contiguous. Move PT_LOAD checking to... (_dl_addr_inside_object): ... here, new function. * elf/dl-sym.c (do_sym): If not l_contiguous, call _dl_addr_inside_object. * elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise. * dlfcn/dlinfo.c (dlinfo_doit): Likewise. * elf/dl-open.c (dl_open_worker): Likewise. (_dl_addr_inside_object): New function if IS_IN_rtld. * elf/dl-load.c (_dl_map_object_from_fd): Set l_contiguous if no holes are present or are PROT_NONE protected. * include/link.h (struct link_map): Add l_contiguous field. * sysdeps/generic/ldsodefs.h (_dl_addr_inside_object): New prototype.
-rw-r--r--ChangeLog22
-rw-r--r--dlfcn/dlinfo.c7
-rw-r--r--elf/dl-addr.c36
-rw-r--r--elf/dl-iteratephdr.c8
-rw-r--r--elf/dl-load.c5
-rw-r--r--elf/dl-open.c24
-rw-r--r--elf/dl-sym.c5
-rw-r--r--include/link.h3
-rw-r--r--sysdeps/generic/ldsodefs.h24
9 files changed, 93 insertions, 41 deletions
diff --git a/ChangeLog b/ChangeLog
index e75170e..4449733 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,25 @@
+2007-06-19 Ulrich Drepper <drepper@redhat.com>
+
+ * sysdeps/generic/ldsodefs.h (rtld_global): Reorder some elements
+ to fill in holes
+ (rtld_global_ro): Likewise.
+
+2007-06-18 Jakub Jelinek <jakub@redhat.com>
+
+ * elf/dl-addr.c (_dl_addr): Skip PT_LOAD checking if l_contiguous.
+ Move PT_LOAD checking to...
+ (_dl_addr_inside_object): ... here, new function.
+ * elf/dl-sym.c (do_sym): If not l_contiguous,
+ call _dl_addr_inside_object.
+ * elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise.
+ * dlfcn/dlinfo.c (dlinfo_doit): Likewise.
+ * elf/dl-open.c (dl_open_worker): Likewise.
+ (_dl_addr_inside_object): New function if IS_IN_rtld.
+ * elf/dl-load.c (_dl_map_object_from_fd): Set l_contiguous if no
+ holes are present or are PROT_NONE protected.
+ * include/link.h (struct link_map): Add l_contiguous field.
+ * sysdeps/generic/ldsodefs.h (_dl_addr_inside_object): New prototype.
+
2007-06-18 Jakub Jelinek <jakub@redhat.com>
Tomas Janousek <tjanouse@redhat.com>
Ulrich Drepper <drepper@redhat.com>
diff --git a/dlfcn/dlinfo.c b/dlfcn/dlinfo.c
index 923127c..b3a3e13 100644
--- a/dlfcn/dlinfo.c
+++ b/dlfcn/dlinfo.c
@@ -1,5 +1,5 @@
/* dlinfo -- Get information from the dynamic linker.
- Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -56,9 +56,8 @@ dlinfo_doit (void *argsblock)
/* Find the highest-addressed object that CALLER is not below. */
for (nsid = 0; nsid < DL_NNS; ++nsid)
for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
- if (caller >= l->l_map_start && caller < l->l_map_end)
- /* There must be exactly one DSO for the range of the virtual
- memory. Otherwise something is really broken. */
+ if (caller >= l->l_map_start && caller < l->l_map_end
+ && (l->l_contiguous || _dl_addr_inside_object (l, caller)))
break;
if (l == NULL)
diff --git a/elf/dl-addr.c b/elf/dl-addr.c
index e131055..17745b5 100644
--- a/elf/dl-addr.c
+++ b/elf/dl-addr.c
@@ -134,22 +134,12 @@ _dl_addr (const void *address, Dl_info *info,
/* Find the highest-addressed object that ADDRESS is not below. */
for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l; l = l->l_next)
- if (addr >= l->l_map_start && addr < l->l_map_end)
+ if (addr >= l->l_map_start && addr < l->l_map_end
+ && (l->l_contiguous || _dl_addr_inside_object (l, addr)))
{
- /* Make sure it lies within one of L's segments. */
- int n = l->l_phnum;
- const ElfW(Addr) reladdr = addr - l->l_addr;
- while (--n >= 0)
- if (l->l_phdr[n].p_type == PT_LOAD)
- {
- if (reladdr - l->l_phdr[n].p_vaddr >= 0
- && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
- {
- determine_info (addr, l, info, mapp, symbolp);
- result = 1;
- goto out;
- }
- }
+ determine_info (addr, l, info, mapp, symbolp);
+ result = 1;
+ goto out;
}
out:
@@ -158,3 +148,19 @@ _dl_addr (const void *address, Dl_info *info,
return result;
}
libc_hidden_def (_dl_addr)
+
+/* Return non-zero if ADDR lies within one of L's segments. */
+int
+internal_function
+_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
+{
+ int n = l->l_phnum;
+ const ElfW(Addr) reladdr = addr - l->l_addr;
+
+ while (--n >= 0)
+ if (l->l_phdr[n].p_type == PT_LOAD
+ && reladdr - l->l_phdr[n].p_vaddr >= 0
+ && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
+ return 1;
+ return 0;
+}
diff --git a/elf/dl-iteratephdr.c b/elf/dl-iteratephdr.c
index d03d8b6..55cf108 100644
--- a/elf/dl-iteratephdr.c
+++ b/elf/dl-iteratephdr.c
@@ -1,5 +1,5 @@
/* Get loaded objects program headers.
- Copyright (C) 2001,2002,2003,2004,2006 Free Software Foundation, Inc.
+ Copyright (C) 2001,2002,2003,2004,2006,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
@@ -54,9 +54,9 @@ __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
nloaded += GL(dl_ns)[cnt]._ns_nloaded;
if (caller >= (const void *) l->l_map_start
- && caller < (const void *) l->l_map_end)
- /* There must be exactly one DSO for the range of the virtual
- memory. Otherwise something is really broken. */
+ && caller < (const void *) l->l_map_end
+ && (l->l_contiguous
+ || _dl_addr_inside_object (l, (ElfW(Addr)) caller)))
ns = cnt;
}
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 1650ef9..025b9fd 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1,5 +1,5 @@
/* Map in a shared object's segments from the file.
- Copyright (C) 1995-2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 1995-2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -1223,6 +1223,8 @@ cannot allocate TLS data structures for initial thread");
loadcmds[nloadcmds - 1].mapstart - c->mapend,
PROT_NONE);
+ l->l_contiguous = 1;
+
goto postmap;
}
@@ -1242,6 +1244,7 @@ cannot allocate TLS data structures for initial thread");
/* Remember which part of the address space this object uses. */
l->l_map_start = c->mapstart + l->l_addr;
l->l_map_end = l->l_map_start + maplength;
+ l->l_contiguous = !has_holes;
while (c < &loadcmds[nloadcmds])
{
diff --git a/elf/dl-open.c b/elf/dl-open.c
index a043cf6..2000f58 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -201,10 +201,10 @@ dl_open_worker (void *a)
for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
if (caller_dlopen >= (const void *) l->l_map_start
- && caller_dlopen < (const void *) l->l_map_end)
+ && caller_dlopen < (const void *) l->l_map_end
+ && (l->l_contiguous
+ || _dl_addr_inside_object (l, (ElfW(Addr)) caller_dlopen)))
{
- /* There must be exactly one DSO for the range of the virtual
- memory. Otherwise something is really broken. */
assert (ns == l->l_ns);
call_map = l;
goto found_caller;
@@ -662,3 +662,21 @@ show_scope (struct link_map *new)
}
}
#endif
+
+#ifdef IS_IN_rtld
+/* Return non-zero if ADDR lies within one of L's segments. */
+int
+internal_function
+_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
+{
+ int n = l->l_phnum;
+ const ElfW(Addr) reladdr = addr - l->l_addr;
+
+ while (--n >= 0)
+ if (l->l_phdr[n].p_type == PT_LOAD
+ && reladdr - l->l_phdr[n].p_vaddr >= 0
+ && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
+ return 1;
+ return 0;
+}
+#endif
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index 1c3ab5c..0e1b258 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -98,10 +98,9 @@ do_sym (void *handle, const char *name, void *who,
for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL;
l = l->l_next)
- if (caller >= l->l_map_start && caller < l->l_map_end)
+ if (caller >= l->l_map_start && caller < l->l_map_end
+ && (l->l_contiguous || _dl_addr_inside_object (l, caller)))
{
- /* There must be exactly one DSO for the range of the virtual
- memory. Otherwise something is really broken. */
match = l;
break;
}
diff --git a/include/link.h b/include/link.h
index 67d7047..56764a9 100644
--- a/include/link.h
+++ b/include/link.h
@@ -187,6 +187,9 @@ struct link_map
is interested in the PLT interception.*/
unsigned int l_removed:1; /* Nozero if the object cannot be used anymore
since it is removed. */
+ unsigned int l_contiguous:1; /* Nonzero if inter-segment holes are
+ mprotected or if no holes are present at
+ all. */
/* Collected information about own RPATH directories. */
struct r_search_path_struct l_rpath_dirs;
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 5205c41..c910ed5 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -439,18 +439,18 @@ struct rtld_global
EXTERN void (*_dl_rtld_unlock_recursive) (void *);
#endif
- /* Prevailing state of the stack, PF_X indicating it's executable. */
- EXTERN ElfW(Word) _dl_stack_flags;
-
/* If loading a shared object requires that we make the stack executable
when it was not, we do it by calling this function.
It returns an errno code or zero on success. */
EXTERN int (*_dl_make_stack_executable_hook) (void **) internal_function;
- /* Highest dtv index currently needed. */
- EXTERN size_t _dl_tls_max_dtv_idx;
+ /* Prevailing state of the stack, PF_X indicating it's executable. */
+ EXTERN ElfW(Word) _dl_stack_flags;
+
/* Flag signalling whether there are gaps in the module ID allocation. */
EXTERN bool _dl_tls_dtv_gaps;
+ /* Highest dtv index currently needed. */
+ EXTERN size_t _dl_tls_max_dtv_idx;
/* Information about the dtv slots. */
EXTERN struct dtv_slotinfo_list
{
@@ -534,15 +534,15 @@ struct rtld_global_ro
#define DL_DEBUG_HELP (1 << 9)
#define DL_DEBUG_PRELINK (1 << 10)
- /* Cached value of `getpagesize ()'. */
- EXTERN size_t _dl_pagesize;
-
/* OS version. */
EXTERN unsigned int _dl_osversion;
/* Platform name. */
EXTERN const char *_dl_platform;
EXTERN size_t _dl_platformlen;
+ /* Cached value of `getpagesize ()'. */
+ EXTERN size_t _dl_pagesize;
+
/* Copy of the content of `_dl_main_searchlist' at startup time. */
EXTERN struct r_scope_elem _dl_initial_searchlist;
@@ -571,9 +571,6 @@ struct rtld_global_ro
/* Expected cache ID. */
EXTERN int _dl_correct_cache_id;
- /* 0 if internal pointer values should not be guarded, 1 if they should. */
- EXTERN int _dl_pointer_guard;
-
/* Mask for hardware capabilities that are available. */
EXTERN uint64_t _dl_hwcap;
@@ -657,6 +654,9 @@ struct rtld_global_ro
/* List of auditing interfaces. */
struct audit_ifaces *_dl_audit;
unsigned int _dl_naudit;
+
+ /* 0 if internal pointer values should not be guarded, 1 if they should. */
+ EXTERN int _dl_pointer_guard;
};
# define __rtld_global_attribute__
# ifdef IS_IN_rtld
@@ -1061,6 +1061,8 @@ extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid);
but never touch anything. Return null if it's not allocated yet. */
extern void *_dl_tls_get_addr_soft (struct link_map *l) internal_function;
+extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
+ internal_function attribute_hidden;
__END_DECLS