diff options
Diffstat (limited to 'main/libc0.9.32/0008-ldso-support-RTLD_NOLOAD.patch')
| -rw-r--r-- | main/libc0.9.32/0008-ldso-support-RTLD_NOLOAD.patch | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/main/libc0.9.32/0008-ldso-support-RTLD_NOLOAD.patch b/main/libc0.9.32/0008-ldso-support-RTLD_NOLOAD.patch new file mode 100644 index 000000000..3902df31e --- /dev/null +++ b/main/libc0.9.32/0008-ldso-support-RTLD_NOLOAD.patch @@ -0,0 +1,235 @@ +From e6fa350aa23280795a912d0edd989d7c98c62710 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi> +Date: Fri, 18 Mar 2011 11:40:04 +0200 +Subject: [PATCH] ldso: support RTLD_NOLOAD +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +So application query if specified modile is loaded or not with +dlopen. + +Signed-off-by: Timo Teräs <timo.teras@iki.fi> +Signed-off-by: Natanael Copa <ncopa@alpinelinux.org> +--- + ldso/include/dl-elf.h | 6 ++++-- + ldso/ldso/dl-elf.c | 30 +++++++++++++++++------------- + ldso/ldso/ldso.c | 4 +++- + ldso/libdl/libdl.c | 5 +++-- + libc/sysdeps/linux/common/bits/dlfcn.h | 4 ++-- + 5 files changed, 29 insertions(+), 20 deletions(-) + +diff --git a/ldso/include/dl-elf.h b/ldso/include/dl-elf.h +index e7203fd..753c346 100644 +--- a/ldso/include/dl-elf.h ++++ b/ldso/include/dl-elf.h +@@ -25,16 +25,18 @@ static __inline__ void _dl_map_cache(void) { } + static __inline__ void _dl_unmap_cache(void) { } + #endif + ++#define DL_RESOLVE_SECURE 0x0001 ++#define DL_RESOLVE_NOLOAD 0x0002 + + /* Function prototypes for non-static stuff in readelflib1.c */ + extern void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt, + unsigned long rel_addr, unsigned long rel_size); + extern int _dl_parse_relocation_information(struct dyn_elf *rpnt, + unsigned long rel_addr, unsigned long rel_size); +-extern struct elf_resolve * _dl_load_shared_library(int secure, ++extern struct elf_resolve * _dl_load_shared_library(int resolve_flags, + struct dyn_elf **rpnt, struct elf_resolve *tpnt, char *full_libname, + int trace_loaded_objects); +-extern struct elf_resolve * _dl_load_elf_shared_library(int secure, ++extern struct elf_resolve * _dl_load_elf_shared_library(int resolve_flags, + struct dyn_elf **rpnt, char *libname); + extern struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname, + int trace_loaded_objects); +diff --git a/ldso/ldso/dl-elf.c b/ldso/ldso/dl-elf.c +index 558176a..e32591a 100644 +--- a/ldso/ldso/dl-elf.c ++++ b/ldso/ldso/dl-elf.c +@@ -132,7 +132,7 @@ _dl_protect_relro (struct elf_resolve *l) + /* This function's behavior must exactly match that + * in uClibc/ldso/util/ldd.c */ + static struct elf_resolve * +-search_for_named_library(const char *name, int secure, const char *path_list, ++search_for_named_library(const char *name, int resolve_flags, const char *path_list, + struct dyn_elf **rpnt, const char *origin) + { + char *mylibname; +@@ -162,7 +162,7 @@ search_for_named_library(const char *name, int secure, const char *path_list, + + if (plen >= 7 && _dl_memcmp(p, "$ORIGIN", 7) == 0) { + int olen; +- if (secure && plen != 7) ++ if ((resolve_flags & DL_RESOLVE_SECURE) && plen != 7) + continue; + if (origin == NULL) + continue; +@@ -182,7 +182,7 @@ search_for_named_library(const char *name, int secure, const char *path_list, + _dl_strcat(mylibname, "/"); + _dl_strcat(mylibname, name); + +- tpnt = _dl_load_elf_shared_library(secure, rpnt, mylibname); ++ tpnt = _dl_load_elf_shared_library(resolve_flags, rpnt, mylibname); + if (tpnt != NULL) + return tpnt; + } +@@ -194,7 +194,7 @@ search_for_named_library(const char *name, int secure, const char *path_list, + unsigned long _dl_error_number; + unsigned long _dl_internal_error_number; + +-struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, ++struct elf_resolve *_dl_load_shared_library(int resolve_flags, struct dyn_elf **rpnt, + struct elf_resolve *tpnt, char *full_libname, int attribute_unused trace_loaded_objects) + { + char *pnt; +@@ -223,7 +223,7 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + + if (libname != full_libname) { + _dl_if_debug_dprint("\ttrying file='%s'\n", full_libname); +- tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname); ++ tpnt1 = _dl_load_elf_shared_library(resolve_flags, rpnt, full_libname); + if (tpnt1) { + return tpnt1; + } +@@ -238,7 +238,7 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + if (pnt) { + pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB]; + _dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt); +- if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt, ++ if ((tpnt1 = search_for_named_library(libname, resolve_flags, pnt, rpnt, + tpnt->libname)) != NULL) + return tpnt1; + } +@@ -247,7 +247,7 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */ + if (_dl_library_path) { + _dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path); +- if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt, NULL)) != NULL) ++ if ((tpnt1 = search_for_named_library(libname, resolve_flags, _dl_library_path, rpnt, NULL)) != NULL) + { + return tpnt1; + } +@@ -261,7 +261,7 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + if (pnt) { + pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB]; + _dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt); +- if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt, NULL)) != NULL) ++ if ((tpnt1 = search_for_named_library(libname, resolve_flags, pnt, rpnt, NULL)) != NULL) + return tpnt1; + } + #endif +@@ -284,7 +284,7 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + || libent[i].flags == LIB_ELF_LIBC0 + || libent[i].flags == LIB_ELF_LIBC5) + && _dl_strcmp(libname, strs + libent[i].sooffset) == 0 +- && (tpnt1 = _dl_load_elf_shared_library(secure, rpnt, strs + libent[i].liboffset)) ++ && (tpnt1 = _dl_load_elf_shared_library(resolve_flags, rpnt, strs + libent[i].liboffset)) + ) { + return tpnt1; + } +@@ -295,14 +295,14 @@ struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt, + /* Look for libraries wherever the shared library loader + * was installed */ + _dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath); +- tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt, NULL); ++ tpnt1 = search_for_named_library(libname, resolve_flags, _dl_ldsopath, rpnt, NULL); + if (tpnt1 != NULL) + return tpnt1; + + /* Lastly, search the standard list of paths for the library. + This list must exactly match the list in uClibc/ldso/util/ldd.c */ + _dl_if_debug_dprint("\tsearching full lib path list\n"); +- tpnt1 = search_for_named_library(libname, secure, ++ tpnt1 = search_for_named_library(libname, resolve_flags, + UCLIBC_RUNTIME_PREFIX "lib:" + UCLIBC_RUNTIME_PREFIX "usr/lib" + #ifndef __LDSO_CACHE_SUPPORT__ +@@ -444,7 +444,7 @@ map_writeable (int infile, ElfW(Phdr) *ppnt, int piclib, int flags, + * are required. + */ + +-struct elf_resolve *_dl_load_elf_shared_library(int secure, ++struct elf_resolve *_dl_load_elf_shared_library(int resolve_flags, + struct dyn_elf **rpnt, char *libname) + { + ElfW(Ehdr) *epnt; +@@ -483,7 +483,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure, + } + /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD), + we don't load the library if it isn't setuid. */ +- if (secure) { ++ if (resolve_flags & DL_RESOLVE_SECURE) { + if (!(st.st_mode & S_ISUID)) { + _dl_close(infile); + return NULL; +@@ -499,6 +499,10 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure, + return tpnt; + } + } ++ if (resolve_flags & DL_RESOLVE_NOLOAD) { ++ _dl_close(infile); ++ return NULL; ++ } + header = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_UNINITIALIZE, -1, 0); + if (_dl_mmap_check_error(header)) { +diff --git a/ldso/ldso/ldso.c b/ldso/ldso/ldso.c +index df16b4f..5cefc22 100644 +--- a/ldso/ldso/ldso.c ++++ b/ldso/ldso/ldso.c +@@ -642,7 +642,9 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, + if (!_dl_secure || _dl_strchr(str, '/') == NULL) { + _dl_if_debug_dprint("\tfile='%s'; needed by '%s'\n", str, _dl_progname); + +- tpnt1 = _dl_load_shared_library(_dl_secure, &rpnt, NULL, str, trace_loaded_objects); ++ tpnt1 = _dl_load_shared_library( ++ _dl_secure ? DL_RESOLVE_SECURE : 0, ++ &rpnt, NULL, str, trace_loaded_objects); + if (!tpnt1) { + #ifdef __LDSO_LDD_SUPPORT__ + if (trace_loaded_objects) +diff --git a/ldso/libdl/libdl.c b/ldso/libdl/libdl.c +index 52c77b0..49e90d0 100644 +--- a/ldso/libdl/libdl.c ++++ b/ldso/libdl/libdl.c +@@ -288,7 +288,7 @@ void *dlopen(const char *libname, int flag) + #endif + + /* A bit of sanity checking... */ +- if (!(flag & (RTLD_LAZY|RTLD_NOW))) { ++ if (!(flag & (RTLD_LAZY|RTLD_NOW|RTLD_NOLOAD))) { + _dl_error_number = LD_BAD_HANDLE; + return NULL; + } +@@ -358,8 +358,9 @@ void *dlopen(const char *libname, int flag) + /* Try to load the specified library */ + _dl_if_debug_print("Trying to dlopen '%s', RTLD_GLOBAL:%d RTLD_NOW:%d\n", + (char*)libname, (flag & RTLD_GLOBAL ? 1:0), (now_flag & RTLD_NOW ? 1:0)); +- tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname, 0); + ++ tpnt = _dl_load_shared_library((flag & RTLD_NOLOAD) ? DL_RESOLVE_NOLOAD : 0, ++ &rpnt, tfrom, (char*)libname, 0); + if (tpnt == NULL) { + _dl_unmap_cache(); + return NULL; +diff --git a/libc/sysdeps/linux/common/bits/dlfcn.h b/libc/sysdeps/linux/common/bits/dlfcn.h +index 4bfbbff..47b42ad 100644 +--- a/libc/sysdeps/linux/common/bits/dlfcn.h ++++ b/libc/sysdeps/linux/common/bits/dlfcn.h +@@ -24,9 +24,9 @@ + /* The MODE argument to `dlopen' contains one of the following: */ + #define RTLD_LAZY 0x00001 /* Lazy function call binding. */ + #define RTLD_NOW 0x00002 /* Immediate function call binding. */ +-#if 0 /* uClibc doesnt support these */ +-#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */ ++#define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */ + #define RTLD_NOLOAD 0x00004 /* Do not load the object. */ ++#if 0 /* uClibc doesnt support these */ + #define RTLD_DEEPBIND 0x00008 /* Use deep binding. */ + #endif + +-- +1.7.8 + |