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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/mseal] elf: Enable RTLD_NODELETE on __libc_unwind_link_get Date: Tue, 4 Jun 2024 13:22:38 +0000 (GMT) [thread overview] Message-ID: <20240604132238.815BC390D99A@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9603fb34c90aef118bd51d96977cdc15643bf908 commit 9603fb34c90aef118bd51d96977cdc15643bf908 Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Tue Jun 4 10:07:41 2024 -0300 elf: Enable RTLD_NODELETE on __libc_unwind_link_get So the libgcc_s.so can also be sealed. The library is loaded once and not unloaded during process execution (only for memory debug with __libc_unwind_link_freeres). Diff: --- include/dlfcn.h | 2 ++ misc/unwind-link.c | 5 +++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/dlfcn.h b/include/dlfcn.h index f49ee1b0c9..06e2ecbdd2 100644 --- a/include/dlfcn.h +++ b/include/dlfcn.h @@ -50,6 +50,8 @@ extern char **__libc_argv attribute_hidden; better error handling semantics for the library. */ #define __libc_dlopen(name) \ __libc_dlopen_mode (name, RTLD_NOW | __RTLD_DLOPEN) +#define __libc_dlopen_nodelete(name) \ + __libc_dlopen_mode (name, RTLD_NODELETE | RTLD_NOW | __RTLD_DLOPEN) extern void *__libc_dlopen_mode (const char *__name, int __mode) attribute_hidden; extern void *__libc_dlsym (void *__map, const char *__name) diff --git a/misc/unwind-link.c b/misc/unwind-link.c index 213a0162a4..7267ecbec3 100644 --- a/misc/unwind-link.c +++ b/misc/unwind-link.c @@ -48,7 +48,7 @@ __libc_unwind_link_get (void) /* Initialize a copy of the data, so that we do not need about unlocking in case the dynamic loader somehow triggers unwinding. */ - void *local_libgcc_handle = __libc_dlopen (LIBGCC_S_SO); + void *local_libgcc_handle = __libc_dlopen_nodelete (LIBGCC_S_SO); if (local_libgcc_handle == NULL) { __libc_lock_unlock (lock); @@ -100,7 +100,8 @@ __libc_unwind_link_get (void) __libc_lock_lock (lock); if (atomic_load_relaxed (&global_libgcc_handle) != NULL) - /* This thread lost the race. Clean up. */ + /* This thread lost the race. Drop the l_direct_opencount and issue + the debug log. */ __libc_dlclose (local_libgcc_handle); else {
next reply other threads:[~2024-06-04 13:22 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-06-04 13:22 Adhemerval Zanella [this message] 2024-06-04 14:08 Adhemerval Zanella 2024-06-04 22:57 Adhemerval Zanella 2024-06-19 13:04 Adhemerval Zanella 2024-06-21 14:30 Adhemerval Zanella
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