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94084c |
Downstream adjustment: Change return type of
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rseq_register_current_thread to bool. Upstream, this was part of the
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commit that introduced the ABI symbols.
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94084c |
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commit a41c8e92350e744a4bc639df5025153d05263e7f
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Dec 9 09:49:32 2021 +0100
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nptl: rseq failure after registration on main thread is fatal
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This simplifies the application programming model.
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Browser sandboxes have already been fixed:
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Sandbox is incompatible with rseq registration
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<https://bugzilla.mozilla.org/show_bug.cgi?id=1651701>
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Allow rseq in the Linux sandboxes. r=gcp
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<https://hg.mozilla.org/mozilla-central/rev/042425712eb1>
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Sandbox needs to support rseq system call
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<https://bugs.chromium.org/p/chromium/issues/detail?id=1104160>
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94084c |
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94084c |
Linux sandbox: Allow rseq(2)
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<https://chromium.googlesource.com/chromium/src.git/+/230675d9ac8f1>
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Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
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index f405fa356c2955ce..109c5e3dc78c9aa2 100644
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--- a/nptl/pthread_create.c
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+++ b/nptl/pthread_create.c
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@@ -371,7 +371,8 @@ start_thread (void *arg)
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/* Register rseq TLS to the kernel. */
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{
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bool do_rseq = THREAD_GETMEM (pd, flags) & ATTR_FLAG_DO_RSEQ;
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- rseq_register_current_thread (pd, do_rseq);
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+ if (!rseq_register_current_thread (pd, do_rseq) && do_rseq)
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+ __libc_fatal ("Fatal glibc error: rseq registration failed\n");
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}
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#ifndef __ASSUME_SET_ROBUST_LIST
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diff --git a/sysdeps/unix/sysv/linux/rseq-internal.h b/sysdeps/unix/sysv/linux/rseq-internal.h
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index 15bc7ffd6eda632d..6a3441f2cc49e7c4 100644
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--- a/sysdeps/unix/sysv/linux/rseq-internal.h
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+++ b/sysdeps/unix/sysv/linux/rseq-internal.h
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@@ -26,7 +26,7 @@
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#include <sys/rseq.h>
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#ifdef RSEQ_SIG
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-static inline void
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+static inline bool
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rseq_register_current_thread (struct pthread *self, bool do_rseq)
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{
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if (do_rseq)
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@@ -35,15 +35,17 @@ rseq_register_current_thread (struct pthread *self, bool do_rseq)
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sizeof (self->rseq_area),
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0, RSEQ_SIG);
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if (!INTERNAL_SYSCALL_ERROR_P (ret))
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- return;
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+ return true;
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}
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THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
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+ return false;
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}
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#else /* RSEQ_SIG */
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static inline void
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rseq_register_current_thread (struct pthread *self, bool do_rseq)
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{
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THREAD_SETMEM (self, rseq_area.cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED);
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+ return false;
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}
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#endif /* RSEQ_SIG */
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