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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug dynamic-link/31164] dlmopen()'ing a shared library that dlopen()'s a non-existent library during initialization returns prematurely Date: Thu, 14 Dec 2023 07:58:46 +0000 [thread overview] Message-ID: <bug-31164-131-8QsfDtxgs5@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-31164-131@http.sourceware.org/bugzilla/> https://sourceware.org/bugzilla/show_bug.cgi?id=31164 Florian Weimer <fweimer at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fweimer at redhat dot com --- Comment #2 from Florian Weimer <fweimer at redhat dot com> --- I believe this was fixed in glibc 2.34 via this commit: commit b2964eb1d9a6b8ab1250e8a881cf406182da5875 Author: Florian Weimer <fweimer@redhat.com> Date: Wed Apr 21 19:49:51 2021 +0200 dlfcn: Failures after dlmopen should not terminate process [BZ #24772] Commit 9e78f6f6e7134a5f299cc8de77370218f8019237 ("Implement _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]") has the side effect that distinct namespaces, as created by dlmopen, now have separate implementations of the rtld exception mechanism. This means that the call to _dl_catch_error from libdl in a secondary namespace does not actually install an exception handler because the thread-local variable catch_hook in the libc.so copy in the secondary namespace is distinct from that of the base namepace. As a result, a dlsym/dlopen/... failure in a secondary namespace terminates the process with a dynamic linker error because it looks to the exception handler mechanism as if no handler has been installed. This commit restores GLRO (dl_catch_error) and uses it to set the handler in the base namespace. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> (There have been other fixes for ld.so exception handling and dlmopen, and more generally dlmopen.) -- You are receiving this mail because: You are on the CC list for the bug.
next prev parent reply other threads:[~2023-12-14 7:58 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-12-13 17:33 [Bug dynamic-link/31164] New: " goodhart at amazon dot com 2023-12-13 19:42 ` [Bug dynamic-link/31164] " goodhart at amazon dot com 2023-12-14 7:58 ` fweimer at redhat dot com [this message] 2024-01-11 15:05 ` goodhart at amazon dot com
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