diff options
| -rw-r--r-- | linker/linker.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/linker/linker.cpp b/linker/linker.cpp index c99042f..d3ac1d0 100644 --- a/linker/linker.cpp +++ b/linker/linker.cpp @@ -37,6 +37,7 @@ #include <string.h> #include <sys/mman.h> #include <sys/param.h> +#include <sys/prctl.h> #include <unistd.h> #include <new> @@ -317,6 +318,13 @@ static void parse_LD_PRELOAD(const char* path) { static bool realpath_fd(int fd, std::string* realpath) { std::vector<char> buf(PATH_MAX), proc_self_fd(PATH_MAX); snprintf(&proc_self_fd[0], proc_self_fd.size(), "/proc/self/fd/%d", fd); + // set DUMPABLE to 1 to access /proc/self/fd + int dumpable = prctl(PR_GET_DUMPABLE, 0, 0, 0, 0); + prctl(PR_SET_DUMPABLE, 1, 0, 0, 0); + auto guard = make_scope_guard([&]() { + // restore dumpable + prctl(PR_SET_DUMPABLE, dumpable, 0, 0, 0); + }); if (readlink(&proc_self_fd[0], &buf[0], buf.size()) == -1) { PRINT("readlink('%s') failed: %s [fd=%d]", &proc_self_fd[0], strerror(errno), fd); return false; |