Date: Fri, 22 May 2020 13:18:43 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r361382 - in stable/11: include lib/libc/gen libexec/rtld-elf Message-ID: <202005221318.04MDIhi7077954@repo.freebsd.org>
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Author: kib Date: Fri May 22 13:18:43 2020 New Revision: 361382 URL: https://svnweb.freebsd.org/changeset/base/361382 Log: MFC r361073: Implement RTLD_DEEPBIND. PR: 246462 Modified: stable/11/include/dlfcn.h stable/11/lib/libc/gen/dlopen.3 stable/11/libexec/rtld-elf/rtld.c stable/11/libexec/rtld-elf/rtld.h Directory Properties: stable/11/ (props changed) Modified: stable/11/include/dlfcn.h ============================================================================== --- stable/11/include/dlfcn.h Fri May 22 13:17:57 2020 (r361381) +++ stable/11/include/dlfcn.h Fri May 22 13:18:43 2020 (r361382) @@ -45,6 +45,8 @@ #define RTLD_TRACE 0x200 /* Trace loaded objects and exit. */ #define RTLD_NODELETE 0x01000 /* Do not remove members. */ #define RTLD_NOLOAD 0x02000 /* Do not load if not already loaded. */ +#define RTLD_DEEPBIND 0x04000 /* Put symbols from the dso ahead of + the global list */ /* * Request arguments for dlinfo(). Modified: stable/11/lib/libc/gen/dlopen.3 ============================================================================== --- stable/11/lib/libc/gen/dlopen.3 Fri May 22 13:17:57 2020 (r361381) +++ stable/11/lib/libc/gen/dlopen.3 Fri May 22 13:18:43 2020 (r361382) @@ -32,7 +32,7 @@ .\" @(#) dlopen.3 1.6 90/01/31 SMI .\" $FreeBSD$ .\" -.Dd January 2, 2019 +.Dd May 14, 2020 .Dt DLOPEN 3 .Os .Sh NAME @@ -162,6 +162,9 @@ the process address space, otherwise is returned. Other mode flags may be specified, which will be applied for promotion for the found object. +.It Dv RTLD_DEEPBIND +Symbols from the loaded library are put before global symbols when +resolving symbolic references originated from the library. .El .Pp If Modified: stable/11/libexec/rtld-elf/rtld.c ============================================================================== --- stable/11/libexec/rtld-elf/rtld.c Fri May 22 13:17:57 2020 (r361381) +++ stable/11/libexec/rtld-elf/rtld.c Fri May 22 13:18:43 2020 (r361382) @@ -3300,6 +3300,8 @@ rtld_dlopen(const char *name, int fd, int mode) lo_flags |= RTLD_LO_NODELETE; if (mode & RTLD_NOLOAD) lo_flags |= RTLD_LO_NOLOAD; + if (mode & RTLD_DEEPBIND) + lo_flags |= RTLD_LO_DEEPBIND; if (ld_tracing != NULL) lo_flags |= RTLD_LO_TRACE; @@ -3351,6 +3353,8 @@ dlopen_object(const char *name, int fd, Obj_Entry *ref if (globallist_next(old_obj_tail) != NULL) { /* We loaded something new. */ assert(globallist_next(old_obj_tail) == obj); + if ((lo_flags & RTLD_LO_DEEPBIND) != 0) + obj->symbolic = true; result = 0; if ((lo_flags & RTLD_LO_EARLY) == 0 && obj->static_tls && !allocate_tls_offset(obj)) { Modified: stable/11/libexec/rtld-elf/rtld.h ============================================================================== --- stable/11/libexec/rtld-elf/rtld.h Fri May 22 13:17:57 2020 (r361381) +++ stable/11/libexec/rtld-elf/rtld.h Fri May 22 13:18:43 2020 (r361382) @@ -303,6 +303,7 @@ TAILQ_HEAD(obj_entry_q, Struct_Obj_Entry); #define RTLD_LO_FILTEES 0x10 /* Loading filtee. */ #define RTLD_LO_EARLY 0x20 /* Do not call ctors, postpone it to the initialization during the image start. */ +#define RTLD_LO_DEEPBIND 0x80 /* Force symbolic for this object */ /* * Symbol cache entry used during relocation to avoid multiple lookups
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