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0c9145f413
Fix build breakage from https://reviews.llvm.org/D154272. (I accidentally dropped the fix when I relanded the patch.)
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
//===-- msan_dl.cpp -------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of MemorySanitizer.
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//
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// Helper functions for unpoisoning results of dladdr and dladdr1.
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//===----------------------------------------------------------------------===//
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#include "msan_dl.h"
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#include <dlfcn.h>
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#include <elf.h>
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#include <link.h>
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#include "msan_poisoning.h"
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namespace __msan {
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void UnpoisonDllAddrInfo(void *info) {
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Dl_info *ptr = (Dl_info *)(info);
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__msan_unpoison(ptr, sizeof(*ptr));
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if (ptr->dli_fname)
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__msan_unpoison(ptr->dli_fname, internal_strlen(ptr->dli_fname) + 1);
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if (ptr->dli_sname)
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__msan_unpoison(ptr->dli_sname, internal_strlen(ptr->dli_sname) + 1);
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}
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#if SANITIZER_GLIBC
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void UnpoisonDllAddr1ExtraInfo(void **extra_info, int flags) {
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if (flags == RTLD_DL_SYMENT) {
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__msan_unpoison(extra_info, sizeof(void *));
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ElfW(Sym) *s = *((ElfW(Sym) **)(extra_info));
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__msan_unpoison(s, sizeof(ElfW(Sym)));
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} else if (flags == RTLD_DL_LINKMAP) {
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__msan_unpoison(extra_info, sizeof(void *));
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struct link_map *map = *((struct link_map **)(extra_info));
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// Walk forward
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for (auto *ptr = map; ptr; ptr = ptr->l_next) {
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__msan_unpoison(ptr, sizeof(struct link_map));
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if (ptr->l_name)
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__msan_unpoison(ptr->l_name, internal_strlen(ptr->l_name) + 1);
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}
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if (!map)
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return;
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// Walk backward
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for (auto *ptr = map->l_prev; ptr; ptr = ptr->l_prev) {
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__msan_unpoison(ptr, sizeof(struct link_map));
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if (ptr->l_name)
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__msan_unpoison(ptr->l_name, internal_strlen(ptr->l_name) + 1);
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}
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}
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}
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#endif
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} // namespace __msan
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