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nptl: rseq failure after registration on main thread is fatal

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This simplifies the application programming model.

Browser sandboxes have already been fixed:

  Sandbox is incompatible with rseq registration
  <https://bugzilla.mozilla.org/show_bug.cgi?id=1651701>

  Allow rseq in the Linux sandboxes. r=gcp
  <https://hg.mozilla.org/mozilla-central/rev/042425712eb1>

  Sandbox needs to support rseq system call
  <https://bugs.chromium.org/p/chromium/issues/detail?id=1104160>

  Linux sandbox: Allow rseq(2)
  <https://chromium.googlesource.com/chromium/src.git/+/230675d9ac8f1>

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
This commit is contained in:
Florian Weimer 2021-12-09 09:49:32 +01:00
parent c901c3e764
commit a41c8e9235
1 changed files with 2 additions and 1 deletions
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3
nptl/pthread_create.c
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@ -370,7 +370,8 @@ start_thread (void *arg)
/* Register rseq TLS to the kernel. */
{
bool do_rseq = THREAD_GETMEM (pd, flags) & ATTR_FLAG_DO_RSEQ;
rseq_register_current_thread (pd, do_rseq);
if (!rseq_register_current_thread (pd, do_rseq) && do_rseq)
__libc_fatal ("Fatal glibc error: rseq registration failed\n");
}
#ifndef __ASSUME_SET_ROBUST_LIST