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Implement RTLD_DEEPBIND.

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PR:	246462
Tested by:	Martin Birgmeier <d8zNeCFG@aon.at>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D24841
This commit is contained in:
Konstantin Belousov 2020-05-15 11:58:01 +00:00
parent 8ffb1c8ce1
commit 1659238a0c
4 changed files with 11 additions and 1 deletions
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2
include/dlfcn.h
View File

@ -47,6 +47,8 @@
#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().

5
lib/libc/gen/dlopen.3
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@ -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

4
libexec/rtld-elf/rtld.c
View File

@ -3366,6 +3366,8 @@ 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 | RTLD_LO_IGNSTLS;
@ -3417,6 +3419,8 @@ dlopen_object(const char *name, int fd, Obj_Entry *refobj, int lo_flags,
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 | RTLD_LO_IGNSTLS)) == 0 &&
obj->static_tls && !allocate_tls_offset(obj)) {

1
libexec/rtld-elf/rtld.h
View File

@ -309,6 +309,7 @@ TAILQ_HEAD(obj_entry_q, Struct_Obj_Entry);
#define RTLD_LO_EARLY 0x20 /* Do not call ctors, postpone it to the
initialization during the image start. */
#define RTLD_LO_IGNSTLS 0x40 /* Do not allocate static TLS */
#define RTLD_LO_DEEPBIND 0x80 /* Force symbolic for this object */
/*
* Symbol cache entry used during relocation to avoid multiple lookups