Move to final version of upstream patch for non-constant SIGSTKSZ
NOTE: I did not build this package because it will cause dependency problems (requiring every other OCaml package in F35 to be rebuilt). If there is a mass rebuild of Rawhide then that would be a good time to rebuild it.
This commit is contained in:
Richard W.M. Jones
parent
b8653f50ff
commit
129153b851
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@ -23,5 +23,5 @@ index 07e2eda1a..340508a60 100644
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> ocamlmklibconfig.ml
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--
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2.29.0.rc2
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2.32.0
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@ -23,5 +23,5 @@ index 83455a3b6..213392b25 100644
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# Enable SSE2 on x86 mingw to avoid using 80-bit registers.
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--
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2.29.0.rc2
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2.32.0
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@ -39,5 +39,5 @@ index 213392b25..c7e594b5d 100644
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# We first compute default values for as and aspp
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# If values have been given by the user then they take precedence over
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--
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2.29.0.rc2
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2.32.0
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@ -0,0 +1,103 @@
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From 3104d92743614f8f52039e0520116af4179880a5 Mon Sep 17 00:00:00 2001
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From: Xavier Leroy <xavierleroy@users.noreply.github.com>
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Date: Fri, 5 Mar 2021 19:14:07 +0100
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Subject: [PATCH 4/4] Dynamically allocate the alternate signal stack (#10266)
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In Glibc 2.34 and later, SIGSTKSZ may not be a compile-time constant.
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It is no longer possible to statically allocate the alternate signal
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stack for the main thread, as we've been doing for the last 25 years.
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This commit implements dynamic allocation of the alternate signal stack
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even for the main thread. It reuses the code already in place to allocate
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the alternate signal stack for other threads.
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Fixes: #10250.
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(cherry picked from commit fc9534746bf5d08a4c109f22e344cf49d5d46d54)
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---
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runtime/caml/signals.h | 2 +-
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runtime/signals_byt.c | 2 +-
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runtime/signals_nat.c | 25 ++++++++++++++-----------
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3 files changed, 16 insertions(+), 13 deletions(-)
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diff --git a/runtime/caml/signals.h b/runtime/caml/signals.h
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index 3ff152c26..285dbd7fe 100644
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--- a/runtime/caml/signals.h
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+++ b/runtime/caml/signals.h
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@@ -87,7 +87,7 @@ value caml_do_pending_actions_exn (void);
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value caml_process_pending_actions_with_root (value extra_root); // raises
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value caml_process_pending_actions_with_root_exn (value extra_root);
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int caml_set_signal_action(int signo, int action);
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-CAMLextern void caml_setup_stack_overflow_detection(void);
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+CAMLextern int caml_setup_stack_overflow_detection(void);
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CAMLextern void (*caml_enter_blocking_section_hook)(void);
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CAMLextern void (*caml_leave_blocking_section_hook)(void);
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diff --git a/runtime/signals_byt.c b/runtime/signals_byt.c
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index 2183142da..38eb5e3a4 100644
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--- a/runtime/signals_byt.c
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+++ b/runtime/signals_byt.c
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@@ -81,4 +81,4 @@ int caml_set_signal_action(int signo, int action)
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return 0;
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}
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-CAMLexport void caml_setup_stack_overflow_detection(void) {}
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+CAMLexport int caml_setup_stack_overflow_detection(void) { return 0; }
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diff --git a/runtime/signals_nat.c b/runtime/signals_nat.c
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index 8b64ab452..2b4004860 100644
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--- a/runtime/signals_nat.c
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+++ b/runtime/signals_nat.c
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@@ -181,8 +181,6 @@ DECLARE_SIGNAL_HANDLER(trap_handler)
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#error "CONTEXT_SP is required if HAS_STACK_OVERFLOW_DETECTION is defined"
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#endif
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-static char sig_alt_stack[SIGSTKSZ];
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-
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/* Code compiled with ocamlopt never accesses more than
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EXTRA_STACK bytes below the stack pointer. */
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#define EXTRA_STACK 256
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@@ -276,28 +274,33 @@ void caml_init_signals(void)
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#endif
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#ifdef HAS_STACK_OVERFLOW_DETECTION
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- {
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- stack_t stk;
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+ if (caml_setup_stack_overflow_detection() != -1) {
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struct sigaction act;
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- stk.ss_sp = sig_alt_stack;
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- stk.ss_size = SIGSTKSZ;
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- stk.ss_flags = 0;
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SET_SIGACT(act, segv_handler);
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act.sa_flags |= SA_ONSTACK | SA_NODEFER;
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sigemptyset(&act.sa_mask);
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- if (sigaltstack(&stk, NULL) == 0) { sigaction(SIGSEGV, &act, NULL); }
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+ sigaction(SIGSEGV, &act, NULL);
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}
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#endif
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}
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-CAMLexport void caml_setup_stack_overflow_detection(void)
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+/* Allocate and select an alternate stack for handling signals,
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+ especially SIGSEGV signals.
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+ Each thread needs its own alternate stack.
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+ The alternate stack used to be statically-allocated for the main thread,
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+ but this is incompatible with Glibc 2.34 and newer, where SIGSTKSZ
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+ may not be a compile-time constant (issue #10250). */
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+
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+CAMLexport int caml_setup_stack_overflow_detection(void)
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{
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#ifdef HAS_STACK_OVERFLOW_DETECTION
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stack_t stk;
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stk.ss_sp = malloc(SIGSTKSZ);
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+ if (stk.ss_sp == NULL) return -1;
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stk.ss_size = SIGSTKSZ;
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stk.ss_flags = 0;
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- if (stk.ss_sp)
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- sigaltstack(&stk, NULL);
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+ return sigaltstack(&stk, NULL);
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+#else
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+ return 0;
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#endif
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}
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--
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2.32.0
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@ -1,39 +0,0 @@
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From dfb5e954a04f59b0456cc4c0ddf3acaf22e0ff07 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Sun, 28 Feb 2021 20:45:47 +0000
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Subject: [PATCH 4/4] Workaround for glibc non-constant SIGSTKSZ
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https://github.com/ocaml/ocaml/issues/10250
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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---
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runtime/signals_nat.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/runtime/signals_nat.c b/runtime/signals_nat.c
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index 8b64ab452..7f0a97513 100644
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--- a/runtime/signals_nat.c
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+++ b/runtime/signals_nat.c
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@@ -181,7 +181,19 @@ DECLARE_SIGNAL_HANDLER(trap_handler)
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#error "CONTEXT_SP is required if HAS_STACK_OVERFLOW_DETECTION is defined"
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#endif
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+#ifndef __GLIBC__
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static char sig_alt_stack[SIGSTKSZ];
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+#else
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+/* glibc 2.34 has non-constant SIGSTKSZ */
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+static char *sig_alt_stack;
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+
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+static void allocate_sig_alt_stack(void) __attribute__((constructor));
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+static void
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+allocate_sig_alt_stack(void)
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+{
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+ sig_alt_stack = malloc(SIGSTKSZ);
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+}
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+#endif
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/* Code compiled with ocamlopt never accesses more than
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EXTRA_STACK bytes below the stack pointer. */
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--
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2.29.0.rc2
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@ -31,7 +31,7 @@
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Name: ocaml
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Version: 4.12.0
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Release: 1%{?dist}
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Release: 2%{?dist}
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Summary: OCaml compiler and programming environment
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@ -60,7 +60,7 @@ Source0: https://caml.inria.fr/pub/distrib/ocaml-4.12/ocaml-%{version}.ta
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Patch0001: 0001-Don-t-add-rpaths-to-libraries.patch
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Patch0002: 0002-configure-Allow-user-defined-C-compiler-flags.patch
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Patch0003: 0003-configure-Remove-incorrect-assumption-about-cross-co.patch
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Patch0004: 0004-Workaround-for-glibc-non-constant-SIGSTKSZ.patch
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Patch0004: 0004-Dynamically-allocate-the-alternate-signal-stack-1026.patch
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BuildRequires: make
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BuildRequires: git
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@ -370,6 +370,9 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/ocaml/eventlog_metadata
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%changelog
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* Wed Jun 23 2021 Richard W.M. Jones <rjones@redhat.com> - 4.12.0-2
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- Move to final version of upstream patch for non-constant SIGSTKSZ
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* Sun Feb 28 2021 Richard W.M. Jones <rjones@redhat.com> - 4.12.0-1
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- OCaml 4.12.0 release (RHBZ#1893381).
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- Workaround for glibc non-constant SIGSTKSZ
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