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74 lines
2.5 KiB
74 lines
2.5 KiB
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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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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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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