From 9620f76a210d9d8c1aaff25e99d6dc513f87e6e9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 04:23:56 +0200 Subject: Adding upstream version 1.8.27. Signed-off-by: Daniel Baumann --- lib/util/sudo_dso.c | 325 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 325 insertions(+) create mode 100644 lib/util/sudo_dso.c (limited to 'lib/util/sudo_dso.c') diff --git a/lib/util/sudo_dso.c b/lib/util/sudo_dso.c new file mode 100644 index 0000000..39d4381 --- /dev/null +++ b/lib/util/sudo_dso.c @@ -0,0 +1,325 @@ +/* + * Copyright (c) 2010, 2012-2014 Todd C. Miller + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include + +#include + +#include +#include +#ifdef HAVE_STRING_H +# include +#endif /* HAVE_STRING_H */ +#ifdef HAVE_STRINGS_H +# include +#endif /* HAVE_STRINGS_H */ +#if defined(HAVE_SHL_LOAD) +# include +#elif defined(HAVE_DLOPEN) +# include +#endif +#include + +#include "sudo_compat.h" +#include "sudo_dso.h" + +/* + * Pointer for statically compiled symbols. + */ +static struct sudo_preload_table *preload_table; + +void +sudo_dso_preload_table_v1(struct sudo_preload_table *table) +{ + preload_table = table; +} + +#if defined(HAVE_SHL_LOAD) + +# ifndef DYNAMIC_PATH +# define DYNAMIC_PATH 0 +# endif + +void * +sudo_dso_load_v1(const char *path, int mode) +{ + struct sudo_preload_table *pt; + int flags = DYNAMIC_PATH | BIND_VERBOSE; + + if (mode == 0) + mode = SUDO_DSO_LAZY; /* default behavior */ + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->path != NULL && strcmp(path, pt->path) == 0) + return pt->handle; + } + } + + /* We don't support SUDO_DSO_GLOBAL or SUDO_DSO_LOCAL yet. */ + if (ISSET(mode, SUDO_DSO_LAZY)) + flags |= BIND_DEFERRED; + if (ISSET(mode, SUDO_DSO_NOW)) + flags |= BIND_IMMEDIATE; + + return (void *)shl_load(path, flags, 0L); +} + +int +sudo_dso_unload_v1(void *handle) +{ + struct sudo_preload_table *pt; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) + return 0; + } + } + + return shl_unload((shl_t)handle); +} + +void * +sudo_dso_findsym_v1(void *vhandle, const char *symbol) +{ + struct sudo_preload_table *pt; + shl_t handle = vhandle; + void *value = NULL; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) { + struct sudo_preload_symbol *sym; + for (sym = pt->symbols; sym->name != NULL; sym++) { + if (strcmp(sym->name, symbol) == 0) + return sym->addr; + } + errno = ENOENT; + return NULL; + } + } + } + + /* + * Note that the behavior of of SUDO_DSO_NEXT and SUDO_DSO_SELF + * differs from most implementations when called from + * a shared library. + */ + if (vhandle == SUDO_DSO_NEXT) { + /* Iterate over all shared libs looking for symbol. */ + shl_t myhandle = PROG_HANDLE; + struct shl_descriptor *desc; + int idx = 0; + + /* Find program's real handle. */ + if (shl_gethandle(PROG_HANDLE, &desc) == 0) + myhandle = desc->handle; + while (shl_get(idx++, &desc) == 0) { + if (desc->handle == myhandle) + continue; + if (shl_findsym(&desc->handle, symbol, TYPE_UNDEFINED, &value) == 0) + break; + } + } else { + if (vhandle == SUDO_DSO_DEFAULT) + handle = NULL; + else if (vhandle == SUDO_DSO_SELF) + handle = PROG_HANDLE; + (void)shl_findsym(&handle, symbol, TYPE_UNDEFINED, &value); + } + + return value; +} + +char * +sudo_dso_strerror_v1(void) +{ + return strerror(errno); +} + +#elif defined(HAVE_DLOPEN) + +# ifndef RTLD_GLOBAL +# define RTLD_GLOBAL 0 +# endif + +void * +sudo_dso_load_v1(const char *path, int mode) +{ + struct sudo_preload_table *pt; + int flags = 0; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->path != NULL && strcmp(path, pt->path) == 0) + return pt->handle; + } + } + + /* Map SUDO_DSO_* -> RTLD_* */ + if (ISSET(mode, SUDO_DSO_LAZY)) + flags |= RTLD_LAZY; + if (ISSET(mode, SUDO_DSO_NOW)) + flags |= RTLD_NOW; + if (ISSET(mode, SUDO_DSO_GLOBAL)) + flags |= RTLD_GLOBAL; + if (ISSET(mode, SUDO_DSO_LOCAL)) + flags |= RTLD_LOCAL; + + return dlopen(path, flags); +} + +int +sudo_dso_unload_v1(void *handle) +{ + struct sudo_preload_table *pt; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) + return 0; + } + } + + return dlclose(handle); +} + +void * +sudo_dso_findsym_v1(void *handle, const char *symbol) +{ + struct sudo_preload_table *pt; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) { + struct sudo_preload_symbol *sym; + for (sym = pt->symbols; sym->name != NULL; sym++) { + if (strcmp(sym->name, symbol) == 0) + return sym->addr; + } + errno = ENOENT; + return NULL; + } + } + } + + /* + * Not all implementations support the special handles. + */ + if (handle == SUDO_DSO_NEXT) { +# ifdef RTLD_NEXT + handle = RTLD_NEXT; +# else + errno = ENOENT; + return NULL; +# endif + } else if (handle == SUDO_DSO_DEFAULT) { +# ifdef RTLD_DEFAULT + handle = RTLD_DEFAULT; +# else + errno = ENOENT; + return NULL; +# endif + } else if (handle == SUDO_DSO_SELF) { +# ifdef RTLD_SELF + handle = RTLD_SELF; +# else + errno = ENOENT; + return NULL; +# endif + } + + return dlsym(handle, symbol); +} + +char * +sudo_dso_strerror_v1(void) +{ + return dlerror(); +} + +#else /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */ + +/* + * Emulate dlopen() using a static list of symbols compiled into sudo. + */ +void * +sudo_dso_load_v1(const char *path, int mode) +{ + struct sudo_preload_table *pt; + + /* Check prelinked symbols first. */ + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->path != NULL && strcmp(path, pt->path) == 0) + return pt->handle; + } + } + return NULL; +} + +int +sudo_dso_unload_v1(void *handle) +{ + struct sudo_preload_table *pt; + + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) + return 0; + } + } + return -1; +} + +void * +sudo_dso_findsym_v1(void *handle, const char *symbol) +{ + struct sudo_preload_table *pt; + + if (preload_table != NULL) { + for (pt = preload_table; pt->handle != NULL; pt++) { + if (pt->handle == handle) { + struct sudo_preload_symbol *sym; + for (sym = pt->symbols; sym->name != NULL; sym++) { + if (strcmp(sym->name, symbol) == 0) + return sym->addr; + } + } + } + } + errno = ENOENT; + return NULL; +} + +char * +sudo_dso_strerror_v1(void) +{ + return strerror(errno); +} +#endif /* !HAVE_SHL_LOAD && !HAVE_DLOPEN */ -- cgit v1.2.3