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commit 08c6e95234c60a5c2f37532d1111acf084f39345
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Jan 11 13:13:28 2018 +0100
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csu: Update __libgcc_s_init comment
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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commit f993b8754080ac7572b692870e926d8b493db16c
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Wed Jan 10 13:18:04 2018 +0100
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nptl: Open libgcc.so with RTLD_NOW during pthread_cancel [BZ #22636]
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Disabling lazy binding reduces stack usage during unwinding.
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Note that RTLD_NOW only makes a difference if libgcc.so has not
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already been loaded, so this is only a partial fix.
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Index: glibc-2.17-c758a686/nptl/sysdeps/pthread/unwind-forcedunwind.c
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/sysdeps/pthread/unwind-forcedunwind.c
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+++ glibc-2.17-c758a686/nptl/sysdeps/pthread/unwind-forcedunwind.c
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@@ -51,7 +51,7 @@ pthread_cancel_init (void)
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return;
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}
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- handle = __libc_dlopen (LIBGCC_S_SO);
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+ handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN);
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if (handle == NULL
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|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
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Index: glibc-2.17-c758a686/sysdeps/gnu/unwind-resume.c
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===================================================================
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--- glibc-2.17-c758a686.orig/sysdeps/gnu/unwind-resume.c
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+++ glibc-2.17-c758a686/sysdeps/gnu/unwind-resume.c
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@@ -35,12 +35,17 @@ init (void)
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void *resume, *personality;
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void *handle;
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- handle = __libc_dlopen (LIBGCC_S_SO);
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+ /* Use RTLD_NOW here for consistency with pthread_cancel_init.
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+ RTLD_NOW will rarely make a difference here because unwinding is
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+ already in progress, so libgcc_s.so has already been loaded if
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+ its unwinder is used. */
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+ handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN);
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if (handle == NULL
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|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
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|| (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
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- __libc_fatal (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
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+ __libc_fatal (LIBGCC_S_SO
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+ " must be installed for unwinding to work\n");
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libgcc_s_resume = resume;
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libgcc_s_personality = personality;
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