MSVSphere Packaging Team
3 months ago
parent
d04fce7775
commit
07f4f71ce9
GPG Key ID:
B2B0B9F29E528FE8
@ -0,0 +1,88 @@
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commit fe06fb313bddf7e4530056897d4a706606e49377
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Aug 1 23:31:23 2024 +0200
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elf: Clarify and invert second argument of _dl_allocate_tls_init
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Also remove an outdated comment: _dl_allocate_tls_init is
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called as part of pthread_create.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff -Nrup a/elf/dl-tls.c b/elf/dl-tls.c
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--- a/elf/dl-tls.c 2024-08-21 13:11:01.422983765 -0400
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+++ b/elf/dl-tls.c 2024-08-21 12:51:17.789904690 -0400
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@@ -558,9 +558,14 @@ _dl_resize_dtv (dtv_t *dtv, size_t max_m
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/* Allocate initial TLS. RESULT should be a non-NULL pointer to storage
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for the TLS space. The DTV may be resized, and so this function may
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call malloc to allocate that space. The loader's GL(dl_load_tls_lock)
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- is taken when manipulating global TLS-related data in the loader. */
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+ is taken when manipulating global TLS-related data in the loader.
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+
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+ If MAIN_THREAD, this is the first call during process
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+ initialization. In this case, TLS initialization for secondary
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+ (audit) namespaces is skipped because that has already been handled
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+ by dlopen. */
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void *
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-_dl_allocate_tls_init (void *result, bool init_tls)
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+_dl_allocate_tls_init (void *result, bool main_thread)
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{
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if (result == NULL)
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/* The memory allocation failed. */
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@@ -639,7 +644,7 @@ _dl_allocate_tls_init (void *result, boo
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because it would already be set by the audit setup. However,
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subsequent thread creation would need to follow the default
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behaviour. */
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- if (map->l_ns != LM_ID_BASE && !init_tls)
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+ if (map->l_ns != LM_ID_BASE && main_thread)
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continue;
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memset (__mempcpy (dest, map->l_tls_initimage,
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map->l_tls_initimage_size), '\0',
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@@ -667,7 +672,7 @@ _dl_allocate_tls (void *mem)
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{
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return _dl_allocate_tls_init (mem == NULL
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? _dl_allocate_tls_storage ()
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- : allocate_dtv (mem), true);
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+ : allocate_dtv (mem), false);
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}
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rtld_hidden_def (_dl_allocate_tls)
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diff -Nrup a/elf/rtld.c b/elf/rtld.c
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--- a/elf/rtld.c 2024-08-21 13:11:01.422983765 -0400
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+++ b/elf/rtld.c 2024-08-21 12:57:33.134783030 -0400
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@@ -2485,7 +2485,7 @@ dl_main (const ElfW(Phdr) *phdr,
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into the main thread's TLS area, which we allocated above.
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Note: thread-local variables must only be accessed after completing
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the next step. */
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- _dl_allocate_tls_init (tcbp, false);
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+ _dl_allocate_tls_init (tcbp, true);
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/* And finally install it for the main thread. */
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if (! tls_init_tp_called)
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diff -Nrup a/nptl/allocatestack.c b/nptl/allocatestack.c
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--- a/nptl/allocatestack.c 2024-08-21 13:11:00.640979593 -0400
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+++ b/nptl/allocatestack.c 2024-08-21 12:51:17.789904690 -0400
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@@ -137,7 +137,7 @@ get_cached_stack (size_t *sizep, void **
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memset (dtv, '\0', (dtv[-1].counter + 1) * sizeof (dtv_t));
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/* Re-initialize the TLS. */
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- _dl_allocate_tls_init (TLS_TPADJ (result), true);
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+ _dl_allocate_tls_init (TLS_TPADJ (result), false);
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return result;
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}
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diff -Nrup a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
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--- a/sysdeps/generic/ldsodefs.h 2024-08-21 13:11:01.423983770 -0400
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+++ b/sysdeps/generic/ldsodefs.h 2024-08-21 13:30:39.072207595 -0400
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@@ -1258,10 +1258,8 @@ extern void _dl_get_tls_static_info (siz
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extern void _dl_allocate_static_tls (struct link_map *map) attribute_hidden;
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-/* These are internal entry points to the two halves of _dl_allocate_tls,
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- only used within rtld.c itself at startup time. */
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extern void *_dl_allocate_tls_storage (void) attribute_hidden;
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-extern void *_dl_allocate_tls_init (void *, bool);
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+extern void *_dl_allocate_tls_init (void *result, bool main_thread);
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rtld_hidden_proto (_dl_allocate_tls_init)
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/* Deallocate memory allocated with _dl_allocate_tls. */
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@ -0,0 +1,524 @@
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commit 5097cd344fd243fb8deb6dec96e8073753f962f9
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Aug 1 23:31:30 2024 +0200
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elf: Avoid re-initializing already allocated TLS in dlopen (bug 31717)
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The old code used l_init_called as an indicator for whether TLS
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initialization was complete. However, it is possible that
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TLS for an object is initialized, written to, and then dlopen
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for this object is called again, and l_init_called is not true at
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this point. Previously, this resulted in TLS being initialized
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twice, discarding any interim writes (technically introducing a
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use-after-free bug even).
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This commit introduces an explicit per-object flag, l_tls_in_slotinfo.
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It indicates whether _dl_add_to_slotinfo has been called for this
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object. This flag is used to avoid double-initialization of TLS.
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In update_tls_slotinfo, the first_static_tls micro-optimization
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is removed because preserving the initalization flag for subsequent
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use by the second loop for static TLS is a bit complicated, and
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another per-object flag does not seem to be worth it. Furthermore,
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the l_init_called flag is dropped from the second loop (for static
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TLS initialization) because l_need_tls_init on its own prevents
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double-initialization.
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The remaining l_init_called usage in resize_scopes and update_scopes
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is just an optimization due to the use of scope_has_map, so it is
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not changed in this commit.
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The isupper check ensures that libc.so.6 is TLS is not reverted.
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Such a revert happens if l_need_tls_init is not cleared in
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_dl_allocate_tls_init for the main_thread case, now that
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l_init_called is not checked anymore in update_tls_slotinfo
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in elf/dl-open.c.
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Reported-by: Jonathon Anderson <janderson@rice.edu>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Conflicts:
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elf/Makefile - usual tests list differences
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diff -Nrup a/elf/Makefile b/elf/Makefile
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--- a/elf/Makefile 2024-08-21 14:24:25.311070834 -0400
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+++ b/elf/Makefile 2024-08-21 14:16:19.905503937 -0400
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@@ -399,6 +399,10 @@ tests += \
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tst-dlmopen-dlerror \
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tst-dlmopen-gethostbyname \
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tst-dlmopen-twice \
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+ tst-dlopen-tlsreinit1 \
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+ tst-dlopen-tlsreinit2 \
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+ tst-dlopen-tlsreinit3 \
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+ tst-dlopen-tlsreinit4 \
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tst-dlopenfail \
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tst-dlopenfail-2 \
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tst-dlopenrpath \
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@@ -753,6 +757,9 @@ modules-names = \
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tst-dlmopen-gethostbyname-mod \
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tst-dlmopen-twice-mod1 \
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tst-dlmopen-twice-mod2 \
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+ tst-dlopen-tlsreinitmod1 \
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+ tst-dlopen-tlsreinitmod2 \
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+ tst-dlopen-tlsreinitmod3 \
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tst-dlopenfaillinkmod \
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tst-dlopenfailmod1 \
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tst-dlopenfailmod2 \
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@@ -2751,3 +2758,26 @@ $(objpfx)tst-recursive-tls.out: \
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15)
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$(objpfx)tst-recursive-tlsmod%.os: tst-recursive-tlsmodN.c
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$(compile-command.c) -DVAR=thread_$* -DFUNC=get_threadvar_$*
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+
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+# Order matters here. The test needs the constructor for
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+# tst-dlopen-tlsreinitmod2.so to be called first.
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+LDFLAGS-tst-dlopen-tlsreinitmod1.so = -Wl,--no-as-needed
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+$(objpfx)tst-dlopen-tlsreinitmod1.so: \
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+ $(objpfx)tst-dlopen-tlsreinitmod3.so $(objpfx)tst-dlopen-tlsreinitmod2.so
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+LDFLAGS-tst-dlopen-tlsreinit2 = -Wl,--no-as-needed
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+$(objpfx)tst-dlopen-tlsreinit2: \
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+ $(objpfx)tst-dlopen-tlsreinitmod3.so $(objpfx)tst-dlopen-tlsreinitmod2.so
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+LDFLAGS-tst-dlopen-tlsreinit4 = -Wl,--no-as-needed
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+$(objpfx)tst-dlopen-tlsreinit4: \
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+ $(objpfx)tst-dlopen-tlsreinitmod3.so $(objpfx)tst-dlopen-tlsreinitmod2.so
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+# tst-dlopen-tlsreinitmod2.so is underlinked and refers to
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+# tst-dlopen-tlsreinitmod3.so. The dependency is provided via
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+# $(objpfx)tst-dlopen-tlsreinitmod1.so.
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+tst-dlopen-tlsreinitmod2.so-no-z-defs = yes
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+$(objpfx)tst-dlopen-tlsreinit.out: $(objpfx)tst-dlopen-tlsreinitmod1.so \
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+ $(objpfx)tst-dlopen-tlsreinitmod2.so $(objpfx)tst-dlopen-tlsreinitmod3.so
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+# Reuse an audit module which provides ample debug logging.
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+$(objpfx)tst-dlopen-tlsreinit3.out: $(objpfx)tst-auditmod1.so
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+tst-dlopen-tlsreinit3-ENV = LD_AUDIT=$(objpfx)tst-auditmod1.so
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+$(objpfx)tst-dlopen-tlsreinit4.out: $(objpfx)tst-auditmod1.so
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+tst-dlopen-tlsreinit4-ENV = LD_AUDIT=$(objpfx)tst-auditmod1.so
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diff -Nrup a/elf/dl-open.c b/elf/dl-open.c
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--- a/elf/dl-open.c 2024-08-21 14:24:25.273070633 -0400
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+++ b/elf/dl-open.c 2024-08-21 14:04:52.834912875 -0400
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@@ -362,17 +362,8 @@ resize_tls_slotinfo (struct link_map *ne
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{
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bool any_tls = false;
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for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
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- {
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- struct link_map *imap = new->l_searchlist.r_list[i];
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-
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- /* Only add TLS memory if this object is loaded now and
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- therefore is not yet initialized. */
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- if (! imap->l_init_called && imap->l_tls_blocksize > 0)
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- {
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- _dl_add_to_slotinfo (imap, false);
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- any_tls = true;
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- }
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- }
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+ if (_dl_add_to_slotinfo (new->l_searchlist.r_list[i], false))
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+ any_tls = true;
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return any_tls;
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}
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@@ -382,22 +373,8 @@ resize_tls_slotinfo (struct link_map *ne
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static void
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update_tls_slotinfo (struct link_map *new)
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{
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- unsigned int first_static_tls = new->l_searchlist.r_nlist;
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for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
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- {
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- struct link_map *imap = new->l_searchlist.r_list[i];
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-
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- /* Only add TLS memory if this object is loaded now and
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- therefore is not yet initialized. */
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- if (! imap->l_init_called && imap->l_tls_blocksize > 0)
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- {
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- _dl_add_to_slotinfo (imap, true);
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-
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- if (imap->l_need_tls_init
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- && first_static_tls == new->l_searchlist.r_nlist)
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- first_static_tls = i;
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- }
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- }
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+ _dl_add_to_slotinfo (new->l_searchlist.r_list[i], true);
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size_t newgen = GL(dl_tls_generation) + 1;
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if (__glibc_unlikely (newgen == 0))
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@@ -409,13 +386,11 @@ TLS generation counter wrapped! Please
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/* We need a second pass for static tls data, because
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_dl_update_slotinfo must not be run while calls to
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_dl_add_to_slotinfo are still pending. */
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- for (unsigned int i = first_static_tls; i < new->l_searchlist.r_nlist; ++i)
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+ for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
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{
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struct link_map *imap = new->l_searchlist.r_list[i];
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- if (imap->l_need_tls_init
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- && ! imap->l_init_called
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- && imap->l_tls_blocksize > 0)
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+ if (imap->l_need_tls_init && imap->l_tls_blocksize > 0)
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{
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/* For static TLS we have to allocate the memory here and
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now, but we can delay updating the DTV. */
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diff -Nrup a/elf/dl-tls.c b/elf/dl-tls.c
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--- a/elf/dl-tls.c 2024-08-21 14:24:25.315070855 -0400
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+++ b/elf/dl-tls.c 2024-08-21 14:20:34.569850644 -0400
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@@ -638,17 +638,21 @@ _dl_allocate_tls_init (void *result, boo
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some platforms use in static programs requires it. */
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dtv[map->l_tls_modid].pointer.val = dest;
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- /* Copy the initialization image and clear the BSS part. For
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- audit modules or dependencies with initial-exec TLS, we can not
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- set the initial TLS image on default loader initialization
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- because it would already be set by the audit setup. However,
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- subsequent thread creation would need to follow the default
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- behaviour. */
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+ /* Copy the initialization image and clear the BSS part.
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+ For audit modules or dependencies with initial-exec TLS,
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+ we can not set the initial TLS image on default loader
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+ initialization because it would already be set by the
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+ audit setup, which uses the dlopen code and already
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+ clears l_need_tls_init. Calls with !main_thread from
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+ pthread_create need to initialze TLS for the current
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+ thread regardless of namespace. */
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if (map->l_ns != LM_ID_BASE && main_thread)
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continue;
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memset (__mempcpy (dest, map->l_tls_initimage,
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map->l_tls_initimage_size), '\0',
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map->l_tls_blocksize - map->l_tls_initimage_size);
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+ if (main_thread)
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+ map->l_need_tls_init = 0;
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}
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total += cnt;
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@@ -1105,9 +1109,32 @@ _dl_tls_initial_modid_limit_setup (void)
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}
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-void
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+/* Add module to slot information data. If DO_ADD is false, only the
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+ required memory is allocated. Must be called with
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+ GL (dl_load_tls_lock) acquired. If the function has already been
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+ called for the link map L with !DO_ADD, then this function will not
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+ raise an exception, otherwise it is possible that it encounters a
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+ memory allocation failure.
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+
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+ Return false if L has already been added to the slotinfo data, or
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+ if L has no TLS data. If the returned value is true, L has been
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+ added with this call (DO_ADD), or has been added in a previous call
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+ (!DO_ADD).
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+
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+ The expected usage is as follows: Call _dl_add_to_slotinfo for
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+ several link maps with DO_ADD set to false, and record if any calls
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+ result in a true result. If there was a true result, call
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+ _dl_add_to_slotinfo again, this time with DO_ADD set to true. (For
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+ simplicity, it's possible to call the function for link maps where
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+ the previous result was false.) The return value from the second
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+ round of calls can be ignored. If there was true result initially,
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+ call _dl_update_slotinfo to update the TLS generation counter. */
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+bool
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_dl_add_to_slotinfo (struct link_map *l, bool do_add)
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{
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+ if (l->l_tls_blocksize == 0 || l->l_tls_in_slotinfo)
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+ return false;
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+
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/* Now that we know the object is loaded successfully add
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modules containing TLS data to the dtv info table. We
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might have to increase its size. */
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@@ -1163,7 +1190,10 @@ cannot create TLS data structures"));
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atomic_store_relaxed (&listp->slotinfo[idx].map, l);
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atomic_store_relaxed (&listp->slotinfo[idx].gen,
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GL(dl_tls_generation) + 1);
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+ l->l_tls_in_slotinfo = true;
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}
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+
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+ return true;
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}
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#if THREAD_GSCOPE_IN_TCB
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diff -Nrup a/elf/tst-dlopen-tlsreinit1.c b/elf/tst-dlopen-tlsreinit1.c
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--- a/elf/tst-dlopen-tlsreinit1.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/elf/tst-dlopen-tlsreinit1.c 2024-08-21 14:04:52.834912875 -0400
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@@ -0,0 +1,40 @@
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+/* Test that dlopen preserves already accessed TLS (bug 31717).
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+ Copyright (C) 2024 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
|
||||
+ modify it under the terms of the GNU Lesser General Public
|
||||
+ License as published by the Free Software Foundation; either
|
||||
+ version 2.1 of the License, or (at your option) any later version.
|
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+
|
||||
+ The GNU C Library is distributed in the hope that it will be useful,
|
||||
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
+ Lesser General Public License for more details.
|
||||
+
|
||||
+ You should have received a copy of the GNU Lesser General Public
|
||||
+ License along with the GNU C Library; if not, see
|
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <stdbool.h>
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+#include <support/check.h>
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+#include <support/xdlfcn.h>
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+#include <ctype.h>
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+
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+static int
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+do_test (void)
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+{
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+ void *handle = xdlopen ("tst-dlopen-tlsreinitmod1.so", RTLD_NOW);
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+
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+ bool *tlsreinitmod3_tested = xdlsym (handle, "tlsreinitmod3_tested");
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+ TEST_VERIFY (*tlsreinitmod3_tested);
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+
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+ xdlclose (handle);
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+
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+ /* This crashes if the libc.so.6 TLS image has been reverted. */
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+ TEST_VERIFY (!isupper ('@'));
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinit2.c b/elf/tst-dlopen-tlsreinit2.c
|
||||
--- a/elf/tst-dlopen-tlsreinit2.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinit2.c 2024-08-21 14:04:52.834912875 -0400
|
||||
@@ -0,0 +1,39 @@
|
||||
+/* Test that dlopen preserves already accessed TLS (bug 31717).
|
||||
+ Variant with initially-linked modules.
|
||||
+ Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
+ This file is part of the GNU C Library.
|
||||
+
|
||||
+ The GNU C Library is free software; you can redistribute it and/or
|
||||
+ modify it under the terms of the GNU Lesser General Public
|
||||
+ License as published by the Free Software Foundation; either
|
||||
+ version 2.1 of the License, or (at your option) any later version.
|
||||
+
|
||||
+ The GNU C Library is distributed in the hope that it will be useful,
|
||||
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
+ Lesser General Public License for more details.
|
||||
+
|
||||
+ You should have received a copy of the GNU Lesser General Public
|
||||
+ License along with the GNU C Library; if not, see
|
||||
+ <https://www.gnu.org/licenses/>. */
|
||||
+
|
||||
+#include <ctype.h>
|
||||
+#include <stdbool.h>
|
||||
+#include <support/check.h>
|
||||
+#include <support/xdlfcn.h>
|
||||
+
|
||||
+
|
||||
+static int
|
||||
+do_test (void)
|
||||
+{
|
||||
+ /* Defined in tst-dlopen-tlsreinitmod3.so. */
|
||||
+ extern bool tlsreinitmod3_tested;
|
||||
+ TEST_VERIFY (tlsreinitmod3_tested);
|
||||
+
|
||||
+ /* This crashes if the libc.so.6 TLS image has been reverted. */
|
||||
+ TEST_VERIFY (!isupper ('@'));
|
||||
+
|
||||
+ return 0;
|
||||
+}
|
||||
+
|
||||
+#include <support/test-driver.c>
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinit3.c b/elf/tst-dlopen-tlsreinit3.c
|
||||
--- a/elf/tst-dlopen-tlsreinit3.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinit3.c 2024-08-21 14:04:52.834912875 -0400
|
||||
@@ -0,0 +1,2 @@
|
||||
+/* Same code, but run with LD_AUDIT=tst-auditmod1.so. */
|
||||
+#include "tst-dlopen-tlsreinit1.c"
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinit4.c b/elf/tst-dlopen-tlsreinit4.c
|
||||
--- a/elf/tst-dlopen-tlsreinit4.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinit4.c 2024-08-21 14:04:52.834912875 -0400
|
||||
@@ -0,0 +1,2 @@
|
||||
+/* Same code, but run with LD_AUDIT=tst-auditmod1.so. */
|
||||
+#include "tst-dlopen-tlsreinit2.c"
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinitmod1.c b/elf/tst-dlopen-tlsreinitmod1.c
|
||||
--- a/elf/tst-dlopen-tlsreinitmod1.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinitmod1.c 2024-08-21 14:04:52.834912875 -0400
|
||||
@@ -0,0 +1,20 @@
|
||||
+/* Test that dlopen preserves already accessed TLS (bug 31717), module 1.
|
||||
+ Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
+ This file is part of the GNU C Library.
|
||||
+
|
||||
+ The GNU C Library is free software; you can redistribute it and/or
|
||||
+ modify it under the terms of the GNU Lesser General Public
|
||||
+ License as published by the Free Software Foundation; either
|
||||
+ version 2.1 of the License, or (at your option) any later version.
|
||||
+
|
||||
+ The GNU C Library is distributed in the hope that it will be useful,
|
||||
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
+ Lesser General Public License for more details.
|
||||
+
|
||||
+ You should have received a copy of the GNU Lesser General Public
|
||||
+ License along with the GNU C Library; if not, see
|
||||
+ <https://www.gnu.org/licenses/>. */
|
||||
+
|
||||
+/* This module triggers loading of tst-dlopen-tlsreinitmod2.so and
|
||||
+ tst-dlopen-tlsreinitmod3.so. */
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinitmod2.c b/elf/tst-dlopen-tlsreinitmod2.c
|
||||
--- a/elf/tst-dlopen-tlsreinitmod2.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinitmod2.c 2024-08-21 14:04:52.835912880 -0400
|
||||
@@ -0,0 +1,30 @@
|
||||
+/* Test that dlopen preserves already accessed TLS (bug 31717), module 2.
|
||||
+ Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
+ This file is part of the GNU C Library.
|
||||
+
|
||||
+ The GNU C Library is free software; you can redistribute it and/or
|
||||
+ modify it under the terms of the GNU Lesser General Public
|
||||
+ License as published by the Free Software Foundation; either
|
||||
+ version 2.1 of the License, or (at your option) any later version.
|
||||
+
|
||||
+ The GNU C Library is distributed in the hope that it will be useful,
|
||||
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
+ Lesser General Public License for more details.
|
||||
+
|
||||
+ You should have received a copy of the GNU Lesser General Public
|
||||
+ License along with the GNU C Library; if not, see
|
||||
+ <https://www.gnu.org/licenses/>. */
|
||||
+
|
||||
+#include <stdio.h>
|
||||
+
|
||||
+/* Defined in tst-dlopen-tlsreinitmod3.so. This an underlinked symbol
|
||||
+ dependency. */
|
||||
+extern void call_tlsreinitmod3 (void);
|
||||
+
|
||||
+static void __attribute__ ((constructor))
|
||||
+tlsreinitmod2_init (void)
|
||||
+{
|
||||
+ puts ("info: constructor of tst-dlopen-tlsreinitmod2.so invoked");
|
||||
+ call_tlsreinitmod3 ();
|
||||
+}
|
||||
diff -Nrup a/elf/tst-dlopen-tlsreinitmod3.c b/elf/tst-dlopen-tlsreinitmod3.c
|
||||
--- a/elf/tst-dlopen-tlsreinitmod3.c 1969-12-31 19:00:00.000000000 -0500
|
||||
+++ b/elf/tst-dlopen-tlsreinitmod3.c 2024-08-21 14:04:52.835912880 -0400
|
||||
@@ -0,0 +1,102 @@
|
||||
+/* Test that dlopen preserves already accessed TLS (bug 31717), module 3.
|
||||
+ Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
+ This file is part of the GNU C Library.
|
||||
+
|
||||
+ The GNU C Library is free software; you can redistribute it and/or
|
||||
+ modify it under the terms of the GNU Lesser General Public
|
||||
+ License as published by the Free Software Foundation; either
|
||||
+ version 2.1 of the License, or (at your option) any later version.
|
||||
+
|
||||
+ The GNU C Library is distributed in the hope that it will be useful,
|
||||
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
+ Lesser General Public License for more details.
|
||||
+
|
||||
+ You should have received a copy of the GNU Lesser General Public
|
||||
+ License along with the GNU C Library; if not, see
|
||||
+ <https://www.gnu.org/licenses/>. */
|
||||
+
|
||||
+#include <dlfcn.h>
|
||||
+#include <stdbool.h>
|
||||
+#include <stdio.h>
|
||||
+#include <unistd.h>
|
||||
+
|
||||
+/* Used to verify from the main program that the test ran. */
|
||||
+bool tlsreinitmod3_tested;
|
||||
+
|
||||
+/* This TLS variable must not revert back to the initial state after
|
||||
+ dlopen. */
|
||||
+static __thread int tlsreinitmod3_state = 1;
|
||||
+
|
||||
+/* Set from the ELF constructor during dlopen. */
|
||||
+static bool tlsreinitmod3_constructed;
|
||||
+
|
||||
+/* Second half of test, behind a compiler barrier. The compiler
|
||||
+ barrier is necessary to prevent carrying over TLS address
|
||||
+ information from call_tlsreinitmod3 to call_tlsreinitmod3_tail. */
|
||||
+void call_tlsreinitmod3_tail (void *self) __attribute__ ((weak));
|
||||
+
|
||||
+/* Called from tst-dlopen-tlsreinitmod2.so. */
|
||||
+void
|
||||
+call_tlsreinitmod3 (void)
|
||||
+{
|
||||
+ printf ("info: call_tlsreinitmod3 invoked (state=%d)\n",
|
||||
+ tlsreinitmod3_state);
|
||||
+
|
||||
+ if (tlsreinitmod3_constructed)
|
||||
+ {
|
||||
+ puts ("error: call_tlsreinitmod3 called after ELF constructor");
|
||||
+ fflush (stdout);
|
||||
+ /* Cannot rely on test harness due to dynamic linking. */
|
||||
+ _exit (1);
|
||||
+ }
|
||||
+
|
||||
+ tlsreinitmod3_state = 2;
|
||||
+
|
||||
+ /* Self-dlopen. This will run the ELF constructor. */
|
||||
+ void *self = dlopen ("tst-dlopen-tlsreinitmod3.so", RTLD_NOW);
|
||||
+ if (self == NULL)
|
||||
+ {
|
||||
+ printf ("error: dlopen: %s\n", dlerror ());
|
||||
+ fflush (stdout);
|
||||
+ /* Cannot rely on test harness due to dynamic linking. */
|
||||
+ _exit (1);
|
||||
+ }
|
||||
+
|
||||
+ call_tlsreinitmod3_tail (self);
|
||||
+}
|
||||
+
|
||||
+void
|
||||
+call_tlsreinitmod3_tail (void *self)
|
||||
+{
|
||||
+ printf ("info: dlopen returned in tlsreinitmod3 (state=%d)\n",
|
||||
+ tlsreinitmod3_state);
|
||||
+
|
||||
+ if (!tlsreinitmod3_constructed)
|
||||
+ {
|
||||
+ puts ("error: dlopen did not call tlsreinitmod3 ELF constructor");
|
||||
+ fflush (stdout);
|
||||
+ /* Cannot rely on test harness due to dynamic linking. */
|
||||
+ _exit (1);
|
||||
+ }
|
||||
+
|
||||
+ if (tlsreinitmod3_state != 2)
|
||||
+ {
|
||||
+ puts ("error: TLS state reverted in tlsreinitmod3");
|
||||
+ fflush (stdout);
|
||||
+ /* Cannot rely on test harness due to dynamic linking. */
|
||||
+ _exit (1);
|
||||
+ }
|
||||
+
|
||||
+ dlclose (self);
|
||||
+
|
||||
+ /* Signal test completion to the main program. */
|
||||
+ tlsreinitmod3_tested = true;
|
||||
+}
|
||||
+
|
||||
+static void __attribute__ ((constructor))
|
||||
+tlsreinitmod3_init (void)
|
||||
+{
|
||||
+ puts ("info: constructor of tst-dlopen-tlsreinitmod3.so invoked");
|
||||
+ tlsreinitmod3_constructed = true;
|
||||
+}
|
||||
diff -Nrup a/include/link.h b/include/link.h
|
||||
--- a/include/link.h 2024-08-21 14:24:24.556066841 -0400
|
||||
+++ b/include/link.h 2024-08-21 14:23:54.674908823 -0400
|
||||
@@ -211,6 +211,8 @@ struct link_map
|
||||
freed, ie. not allocated with
|
||||
the dummy malloc in ld.so. */
|
||||
unsigned int l_ld_readonly:1; /* Nonzero if dynamic section is readonly. */
|
||||
+ unsigned int l_tls_in_slotinfo:1; /* TLS slotinfo updated in dlopen. */
|
||||
+
|
||||
|
||||
/* NODELETE status of the map. Only valid for maps of type
|
||||
lt_loaded. Lazy binding sets l_nodelete_active directly,
|
||||
diff -Nrup a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
|
||||
--- a/sysdeps/generic/ldsodefs.h 2024-08-21 14:24:25.317070865 -0400
|
||||
+++ b/sysdeps/generic/ldsodefs.h 2024-08-21 14:04:52.835912880 -0400
|
||||
@@ -1291,13 +1291,7 @@ extern void *_dl_open (const char *name,
|
||||
extern int _dl_scope_free (void *) attribute_hidden;
|
||||
|
||||
|
||||
-/* Add module to slot information data. If DO_ADD is false, only the
|
||||
- required memory is allocated. Must be called with GL
|
||||
- (dl_load_tls_lock) acquired. If the function has already been called
|
||||
- for the link map L with !do_add, then this function will not raise
|
||||
- an exception, otherwise it is possible that it encounters a memory
|
||||
- allocation failure. */
|
||||
-extern void _dl_add_to_slotinfo (struct link_map *l, bool do_add)
|
||||
+extern bool _dl_add_to_slotinfo (struct link_map *l, bool do_add)
|
||||
attribute_hidden;
|
||||
|
||||
/* Update slot information data for at least the generation of the
|
||||
@ -0,0 +1,16 @@
|
||||
Author: Patsy Griffin <patsy@redhat.com>
|
||||
|
||||
Fix a typo in naming tst-dlopen-tlsreinit1.out
|
||||
|
||||
diff -Nrup a/elf/Makefile b/elf/Makefile
|
||||
--- a/elf/Makefile 2024-08-16 13:27:00.700921146 -0400
|
||||
+++ b/elf/Makefile 2024-08-16 13:29:12.951628406 -0400
|
||||
@@ -2802,7 +2802,7 @@ $(objpfx)tst-dlopen-tlsreinit4: \
|
||||
# tst-dlopen-tlsreinitmod3.so. The dependency is provided via
|
||||
# $(objpfx)tst-dlopen-tlsreinitmod1.so.
|
||||
tst-dlopen-tlsreinitmod2.so-no-z-defs = yes
|
||||
-$(objpfx)tst-dlopen-tlsreinit.out: $(objpfx)tst-dlopen-tlsreinitmod1.so \
|
||||
+$(objpfx)tst-dlopen-tlsreinit1.out: $(objpfx)tst-dlopen-tlsreinitmod1.so \
|
||||
$(objpfx)tst-dlopen-tlsreinitmod2.so $(objpfx)tst-dlopen-tlsreinitmod3.so
|
||||
# Reuse an audit module which provides ample debug logging.
|
||||
$(objpfx)tst-dlopen-tlsreinit3.out: $(objpfx)tst-auditmod1.so
|
||||
Loading…
Reference in new issue