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From: H.J. Lu <hjl@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/release/2.33/master] elf: Replace nsid with args.nsid [BZ #27609] Date: Wed, 13 Oct 2021 12:57:34 +0000 (GMT) [thread overview] Message-ID: <20211013125734.242A23858403@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6090cf1330faf2deb17285758f327cb23b89ebf1 commit 6090cf1330faf2deb17285758f327cb23b89ebf1 Author: H.J. Lu <hjl.tools@gmail.com> Date: Thu Sep 30 10:29:17 2021 -0700 elf: Replace nsid with args.nsid [BZ #27609] commit ec935dea6332cb22f9881cd1162bad156173f4b0 Author: Florian Weimer <fweimer@redhat.com> Date: Fri Apr 24 22:31:15 2020 +0200 elf: Implement __libc_early_init has @@ -856,6 +876,11 @@ no more namespaces available for dlmopen()")); /* See if an error occurred during loading. */ if (__glibc_unlikely (exception.errstring != NULL)) { + /* Avoid keeping around a dangling reference to the libc.so link + map in case it has been cached in libc_map. */ + if (!args.libc_already_loaded) + GL(dl_ns)[nsid].libc_map = NULL; + do_dlopen calls _dl_open with nsid == __LM_ID_CALLER (-2), which calls dl_open_worker with args.nsid = nsid. dl_open_worker updates args.nsid if it is __LM_ID_CALLER. After dl_open_worker returns, it is wrong to use nsid. Replace nsid with args.nsid after dl_open_worker returns. This fixes BZ #27609. (cherry picked from commit 1e1ecea62e899acb58c3fdf3b320a0833ddd0dff) Diff: --- elf/dl-open.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/elf/dl-open.c b/elf/dl-open.c index ab7aaa345e..1b965457c4 100644 --- a/elf/dl-open.c +++ b/elf/dl-open.c @@ -881,7 +881,7 @@ no more namespaces available for dlmopen()")); /* Avoid keeping around a dangling reference to the libc.so link map in case it has been cached in libc_map. */ if (!args.libc_already_loaded) - GL(dl_ns)[nsid].libc_map = NULL; + GL(dl_ns)[args.nsid].libc_map = NULL; /* Remove the object from memory. It may be in an inconsistent state if relocation failed, for example. */
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