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rtld dl_iterate_phdr(): dlpi_tls_data is wrong

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dl_iterate_phdr() dlpi_tls_data should provide the TLS module segment
address, and not the TLS init segment address as it does now.

Reported by:	emacsray@gmail.com
PR:	254774
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2021-04-05 06:05:44 +03:00
parent 843d16436d
commit d36d681615
5 changed files with 21 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
lib/libc/gen/dl_iterate_phdr.3
View File

@ -15,7 +15,7 @@
.\"
.\" $OpenBSD: dl_iterate_phdr.3,v 1.3 2007/05/31 19:19:48 jmc Exp $
.\" $FreeBSD$
.Dd October 9, 2014
.Dd April 5, 2021
.Dt DL_ITERATE_PHDR 3
.Os
.Sh NAME
@ -80,7 +80,10 @@ The counter of the object unloads performed by the dynamic linker.
.It Fa dlpi_tls_modid
The TLS index of the object.
.It Fa dlpi_tls_data
A pointer to the initialization data for the object TLS segment.
A pointer to the calling thread' TLS data segment for this module,
if it was allocated,
.Dv NULL
otherwise.
.El
.Pp
Future versions of

1
libexec/rtld-elf/Symbol.map
View File

@ -34,4 +34,5 @@ FBSDprivate_1.0 {
_r_debug_postinit;
_rtld_version__FreeBSD_version;
_rtld_version_laddr_offset;
_rtld_version_dlpi_tls_data;
};

7
libexec/rtld-elf/rtld.1
View File

@ -424,6 +424,13 @@ See
Also it indicates the presence of
.Va l_refname
member of the structure.
.It Dv _rtld_version_dlpi_tls_data
The
.Va dlpi_tls_data
member of the structure
.Vt dl_phdr_info
contains the address of the module TLS segment for the calling thread,
and not the address of the initialization segment.
.El
.Sh FILES
.Bl -tag -width ".Pa /var/run/ld-elf32.so.hints" -compact

8
libexec/rtld-elf/rtld.c
View File

@ -3909,13 +3909,16 @@ dlinfo(void *handle, int request, void *p)
static void
rtld_fill_dl_phdr_info(const Obj_Entry *obj, struct dl_phdr_info *phdr_info)
{
tls_index ti;
phdr_info->dlpi_addr = (Elf_Addr)obj->relocbase;
phdr_info->dlpi_name = obj->path;
phdr_info->dlpi_phdr = obj->phdr;
phdr_info->dlpi_phnum = obj->phsize / sizeof(obj->phdr[0]);
phdr_info->dlpi_tls_modid = obj->tlsindex;
phdr_info->dlpi_tls_data = obj->tlsinit;
ti.ti_module = obj->tlsindex;
ti.ti_offset = 0;
phdr_info->dlpi_tls_data = __tls_get_addr(&ti);
phdr_info->dlpi_adds = obj_loads;
phdr_info->dlpi_subs = obj_loads - obj_count;
}
@ -5914,3 +5917,6 @@ int _rtld_version__FreeBSD_version = __FreeBSD_version;
extern char _rtld_version_laddr_offset __exported;
char _rtld_version_laddr_offset;
extern char _rtld_version_dlpi_tls_data __exported;
char _rtld_version_dlpi_tls_data;

2
sys/sys/param.h
View File

@ -60,7 +60,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
#define __FreeBSD_version 1400006 /* Master, propagated to newvers */
#define __FreeBSD_version 1400007 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,