linux-libc-headers_2.6.31.bb : add newest kernel headers, this has the

0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch enabled
which is getting to be needed for udev.

DEF_PREF = -1 for now as I havent tested this properly yet

1 files changed, 429 insertions, 0 deletions

diff --git a/recipes/linux-libc-headers/linux-libc-headers-2.6.31/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch b/recipes/linux-libc-headers/linux-libc-headers-2.6.31/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch
new file mode 100644
index 0000000000..1dee314700
--- /dev/null
+++ b/recipes/linux-libc-headers/linux-libc-headers-2.6.31/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch
@@ -0,0 +1,429 @@
+Path: news.gmane.org!not-for-mail
+From: Mikael Pettersson <mikpe@it.uu.se>
+Newsgroups: gmane.linux.ports.arm.kernel
+Subject: [PATCH][v3] ARM support for
+	TIF_RESTORE_SIGMASK/pselect6/ppoll/epoll_pwait
+Date: Sat, 15 Aug 2009 13:09:28 +0200 (MEST)
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+Approved: news@gmane.org
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+Xref: news.gmane.org gmane.linux.ports.arm.kernel:64340
+Archived-At: <http://permalink.gmane.org/gmane.linux.ports.arm.kernel/64340>
+
+This patch adds support for TIF_RESTORE_SIGMASK to ARM's signal handling,
+which allows to hook up the pselect6, ppoll, and epoll_pwait syscalls on ARM.
+
+Tested here with eabi userspace and a test program with a deliberate race
+between a child's exit and the parent's sigprocmask/select sequence.
+Using sys_pselect6() instead of sigprocmask/select reliably prevents the race.
+
+The other arch's support for TIF_RESTORE_SIGMASK has evolved over time:
+
+In 2.6.16:
+- add TIF_RESTORE_SIGMASK which parallels TIF_SIGPENDING
+- test both when checking for pending signal [bad, changed later]
+- reimplement sys_sigsuspend() to use current->saved_sigmask,
+  TIF_RESTORE_SIGMASK [changed later], and -ERESTARTNOHAND;
+  ditto for sys_rt_sigsuspend(), but drop private code and
+  use common code via __ARCH_WANT_SYS_RT_SIGSUSPEND;
+- there are now no "extra" calls to do_signal() so its oldset
+  parameter is always &current->blocked so need not be passed,
+  also its return value is changed to void
+- change handle_signal() to return 0/-errno
+- change do_signal() to honor TIF_RESTORE_SIGMASK:
+  + get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK is set
+  + if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+  + if no signal was delivered and TIF_RESTORE_SIGMASK is set then
+    clear it and restore the sigmask
+- hook up sys_pselect6() and sys_ppoll()
+
+In 2.6.19:
+- hook up sys_epoll_pwait()
+
+In 2.6.26:
+- allow archs to override how TIF_RESTORE_SIGMASK is implemented;
+  default set_restore_sigmask() sets both TIF_RESTORE_SIGMASK and
+  TIF_SIGPENDING; archs need now just test TIF_SIGPENDING again
+  when checking for pending signal work; some archs now implement
+  TIF_RESTORE_SIGMASK as a secondary/non-atomic thread flag bit
+- call set_restore_sigmask() in sys_sigsuspend() instead of setting
+  TIF_RESTORE_SIGMASK
+
+In 2.6.29-rc:
+- kill sys_pselect7() which no arch wanted
+
+So for 2.6.31-rc6/ARM this patch does the following:
+- Add TIF_RESTORE_SIGMASK. Use the generic set_restore_sigmask()
+  which sets both TIF_SIGPENDING and TIF_RESTORE_SIGMASK, so
+  TIF_RESTORE_SIGMASK need not claim one of the scarce low thread
+  flags, and existing TIF_SIGPENDING and _TIF_WORK_MASK tests need
+  not be extended for TIF_RESTORE_SIGMASK.
+- sys_sigsuspend() is reimplemented to use current->saved_sigmask and
+  set_restore_sigmask(), making it identical to most other archs.
+- The private code for sys_rt_sigsuspend() is removed, instead generic
+  code supplies it via __ARCH_WANT_SYS_RT_SIGSUSPEND.
+- sys_sigsuspend() and sys_rt_sigsuspend() no longer need a pt_regs
+  parameter, so their assembly code wrappers are removed.
+- handle_signal() is changed to return 0 on success or -errno.
+- The oldset parameter to do_signal() is now redundant and removed,
+  and the return value is now also redundant so it's changed to void.
+- do_signal() is changed to honor TIF_RESTORE_SIGMASK:
+  + get oldset from current->saved_sigmask if TIF_RESTORE_SIGMASK is set
+  + if handle_signal() was successful then clear TIF_RESTORE_SIGMASK
+  + if no signal was delivered and TIF_RESTORE_SIGMASK is set then
+    clear it and restore the sigmask
+- Hook up sys_pselect6, sys_ppoll, and sys_epoll_pwait.
+
+Signed-off-by: Mikael Pettersson
+---
+Changes from previous versions:
+
+v2 (only posted as incremental diff against v1):
+- moved sigmask restoration in no-signal-delivered case into
+  "if (syscall)" block for extra protection against exception
+  path also invoking do_signal()
+v3 (this version):
+- moved oldset initialisation into "if (signr > 0)" block,
+  as requested by Russell
+
+ arch/arm/include/asm/thread_info.h |    2 
+ arch/arm/include/asm/unistd.h      |    7 +--
+ arch/arm/kernel/calls.S            |   10 ++--
+ arch/arm/kernel/entry-common.S     |   10 ----
+ arch/arm/kernel/signal.c           |   86 +++++++++++++++----------------------
+ 5 files changed, 48 insertions(+), 67 deletions(-)
+
+diff -rupN linux-2.6.31-rc6/arch/arm/include/asm/thread_info.h linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/include/asm/thread_info.h
+--- linux-2.6.31-rc6/arch/arm/include/asm/thread_info.h	2009-08-14 11:11:10.000000000 +0200
++++ linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/include/asm/thread_info.h	2009-08-14 11:26:44.000000000 +0200
+@@ -140,6 +140,7 @@ extern void vfp_sync_state(struct thread
+ #define TIF_USING_IWMMXT	17
+ #define TIF_MEMDIE		18
+ #define TIF_FREEZE		19
++#define TIF_RESTORE_SIGMASK	20
+ 
+ #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+ #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+@@ -147,6 +148,7 @@ extern void vfp_sync_state(struct thread
+ #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
+ #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
+ #define _TIF_FREEZE		(1 << TIF_FREEZE)
++#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+ 
+ /*
+  * Change these and you break ASM code in entry-common.S
+diff -rupN linux-2.6.31-rc6/arch/arm/include/asm/unistd.h linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/include/asm/unistd.h
+--- linux-2.6.31-rc6/arch/arm/include/asm/unistd.h	2009-08-14 11:11:10.000000000 +0200
++++ linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/include/asm/unistd.h	2009-08-14 11:26:44.000000000 +0200
+@@ -360,8 +360,8 @@
+ #define __NR_readlinkat			(__NR_SYSCALL_BASE+332)
+ #define __NR_fchmodat			(__NR_SYSCALL_BASE+333)
+ #define __NR_faccessat			(__NR_SYSCALL_BASE+334)
+-					/* 335 for pselect6 */
+-					/* 336 for ppoll */
++#define __NR_pselect6			(__NR_SYSCALL_BASE+335)
++#define __NR_ppoll			(__NR_SYSCALL_BASE+336)
+ #define __NR_unshare			(__NR_SYSCALL_BASE+337)
+ #define __NR_set_robust_list		(__NR_SYSCALL_BASE+338)
+ #define __NR_get_robust_list		(__NR_SYSCALL_BASE+339)
+@@ -372,7 +372,7 @@
+ #define __NR_vmsplice			(__NR_SYSCALL_BASE+343)
+ #define __NR_move_pages			(__NR_SYSCALL_BASE+344)
+ #define __NR_getcpu			(__NR_SYSCALL_BASE+345)
+-					/* 346 for epoll_pwait */
++#define __NR_epoll_pwait		(__NR_SYSCALL_BASE+346)
+ #define __NR_kexec_load			(__NR_SYSCALL_BASE+347)
+ #define __NR_utimensat			(__NR_SYSCALL_BASE+348)
+ #define __NR_signalfd			(__NR_SYSCALL_BASE+349)
+@@ -432,6 +432,7 @@
+ #define __ARCH_WANT_SYS_SIGPENDING
+ #define __ARCH_WANT_SYS_SIGPROCMASK
+ #define __ARCH_WANT_SYS_RT_SIGACTION
++#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+ 
+ #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
+ #define __ARCH_WANT_SYS_TIME
+diff -rupN linux-2.6.31-rc6/arch/arm/kernel/calls.S linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/calls.S
+--- linux-2.6.31-rc6/arch/arm/kernel/calls.S	2009-08-14 11:11:10.000000000 +0200
++++ linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/calls.S	2009-08-14 11:26:44.000000000 +0200
+@@ -81,7 +81,7 @@
+ 		CALL(sys_ni_syscall)		/* was sys_ssetmask */
+ /* 70 */	CALL(sys_setreuid16)
+ 		CALL(sys_setregid16)
+-		CALL(sys_sigsuspend_wrapper)
++		CALL(sys_sigsuspend)
+ 		CALL(sys_sigpending)
+ 		CALL(sys_sethostname)
+ /* 75 */	CALL(sys_setrlimit)
+@@ -188,7 +188,7 @@
+ 		CALL(sys_rt_sigpending)
+ 		CALL(sys_rt_sigtimedwait)
+ 		CALL(sys_rt_sigqueueinfo)
+-		CALL(sys_rt_sigsuspend_wrapper)
++		CALL(sys_rt_sigsuspend)
+ /* 180 */	CALL(ABI(sys_pread64, sys_oabi_pread64))
+ 		CALL(ABI(sys_pwrite64, sys_oabi_pwrite64))
+ 		CALL(sys_chown16)
+@@ -344,8 +344,8 @@
+ 		CALL(sys_readlinkat)
+ 		CALL(sys_fchmodat)
+ 		CALL(sys_faccessat)
+-/* 335 */	CALL(sys_ni_syscall)		/* eventually pselect6 */
+-		CALL(sys_ni_syscall)		/* eventually ppoll */
++/* 335 */	CALL(sys_pselect6)
++		CALL(sys_ppoll)
+ 		CALL(sys_unshare)
+ 		CALL(sys_set_robust_list)
+ 		CALL(sys_get_robust_list)
+@@ -355,7 +355,7 @@
+ 		CALL(sys_vmsplice)
+ 		CALL(sys_move_pages)
+ /* 345 */	CALL(sys_getcpu)
+-		CALL(sys_ni_syscall)		/* eventually epoll_pwait */
++		CALL(sys_epoll_pwait)
+ 		CALL(sys_kexec_load)
+ 		CALL(sys_utimensat)
+ 		CALL(sys_signalfd)
+diff -rupN linux-2.6.31-rc6/arch/arm/kernel/entry-common.S linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/entry-common.S
+--- linux-2.6.31-rc6/arch/arm/kernel/entry-common.S	2009-08-14 11:11:10.000000000 +0200
++++ linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/entry-common.S	2009-08-14 11:26:44.000000000 +0200
+@@ -373,16 +373,6 @@ sys_clone_wrapper:
+ 		b	sys_clone
+ ENDPROC(sys_clone_wrapper)
+ 
+-sys_sigsuspend_wrapper:
+-		add	r3, sp, #S_OFF
+-		b	sys_sigsuspend
+-ENDPROC(sys_sigsuspend_wrapper)
+-
+-sys_rt_sigsuspend_wrapper:
+-		add	r2, sp, #S_OFF
+-		b	sys_rt_sigsuspend
+-ENDPROC(sys_rt_sigsuspend_wrapper)
+-
+ sys_sigreturn_wrapper:
+ 		add	r0, sp, #S_OFF
+ 		b	sys_sigreturn
+diff -rupN linux-2.6.31-rc6/arch/arm/kernel/signal.c linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/signal.c
+--- linux-2.6.31-rc6/arch/arm/kernel/signal.c	2009-08-14 11:11:10.000000000 +0200
++++ linux-2.6.31-rc6.arm-restore-sigmask-v3/arch/arm/kernel/signal.c	2009-08-14 11:26:44.000000000 +0200
+@@ -47,57 +47,22 @@ const unsigned long sigreturn_codes[7] =
+ 	MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
+ };
+ 
+-static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
+-
+ /*
+  * atomically swap in the new signal mask, and wait for a signal.
+  */
+-asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
++asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
+ {
+-	sigset_t saveset;
+-
+ 	mask &= _BLOCKABLE;
+ 	spin_lock_irq(&current->sighand->siglock);
+-	saveset = current->blocked;
++	current->saved_sigmask = current->blocked;
+ 	siginitset(&current->blocked, mask);
+ 	recalc_sigpending();
+ 	spin_unlock_irq(&current->sighand->siglock);
+-	regs->ARM_r0 = -EINTR;
+-
+-	while (1) {
+-		current->state = TASK_INTERRUPTIBLE;
+-		schedule();
+-		if (do_signal(&saveset, regs, 0))
+-			return regs->ARM_r0;
+-	}
+-}
+-
+-asmlinkage int
+-sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
+-{
+-	sigset_t saveset, newset;
+-
+-	/* XXX: Don't preclude handling different sized sigset_t's. */
+-	if (sigsetsize != sizeof(sigset_t))
+-		return -EINVAL;
+-
+-	if (copy_from_user(&newset, unewset, sizeof(newset)))
+-		return -EFAULT;
+-	sigdelsetmask(&newset, ~_BLOCKABLE);
+-
+-	spin_lock_irq(&current->sighand->siglock);
+-	saveset = current->blocked;
+-	current->blocked = newset;
+-	recalc_sigpending();
+-	spin_unlock_irq(&current->sighand->siglock);
+-	regs->ARM_r0 = -EINTR;
+ 
+-	while (1) {
+-		current->state = TASK_INTERRUPTIBLE;
+-		schedule();
+-		if (do_signal(&saveset, regs, 0))
+-			return regs->ARM_r0;
+-	}
++	current->state = TASK_INTERRUPTIBLE;
++	schedule();
++	set_restore_sigmask();
++	return -ERESTARTNOHAND;
+ }
+ 
+ asmlinkage int 
+@@ -545,7 +510,7 @@ static inline void setup_syscall_restart
+ /*
+  * OK, we're invoking a handler
+  */	
+-static void
++static int
+ handle_signal(unsigned long sig, struct k_sigaction *ka,
+ 	      siginfo_t *info, sigset_t *oldset,
+ 	      struct pt_regs * regs, int syscall)
+@@ -596,7 +561,7 @@ handle_signal(unsigned long sig, struct 
+ 
+ 	if (ret != 0) {
+ 		force_sigsegv(sig, tsk);
+-		return;
++		return ret;
+ 	}
+ 
+ 	/*
+@@ -610,6 +575,7 @@ handle_signal(unsigned long sig, struct 
+ 	recalc_sigpending();
+ 	spin_unlock_irq(&tsk->sighand->siglock);
+ 
++	return 0;
+ }
+ 
+ /*
+@@ -621,7 +587,7 @@ handle_signal(unsigned long sig, struct 
+  * the kernel can handle, and then we build all the user-level signal handling
+  * stack-frames in one go after that.
+  */
+-static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
++static void do_signal(struct pt_regs *regs, int syscall)
+ {
+ 	struct k_sigaction ka;
+ 	siginfo_t info;
+@@ -634,7 +600,7 @@ static int do_signal(sigset_t *oldset, s
+ 	 * if so.
+ 	 */
+ 	if (!user_mode(regs))
+-		return 0;
++		return;
+ 
+ 	if (try_to_freeze())
+ 		goto no_signal;
+@@ -643,9 +609,24 @@ static int do_signal(sigset_t *oldset, s
+ 
+ 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ 	if (signr > 0) {
+-		handle_signal(signr, &ka, &info, oldset, regs, syscall);
++		sigset_t *oldset;
++
++		if (test_thread_flag(TIF_RESTORE_SIGMASK))
++			oldset = &current->saved_sigmask;
++		else
++			oldset = &current->blocked;
++		if (handle_signal(signr, &ka, &info, oldset, regs, syscall) == 0) {
++			/*
++			 * A signal was successfully delivered; the saved
++			 * sigmask will have been stored in the signal frame,
++			 * and will be restored by sigreturn, so we can simply
++			 * clear the TIF_RESTORE_SIGMASK flag.
++			 */
++			if (test_thread_flag(TIF_RESTORE_SIGMASK))
++				clear_thread_flag(TIF_RESTORE_SIGMASK);
++		}
+ 		single_step_set(current);
+-		return 1;
++		return;
+ 	}
+ 
+  no_signal:
+@@ -697,14 +678,21 @@ static int do_signal(sigset_t *oldset, s
+ 		    regs->ARM_r0 == -ERESTARTNOINTR) {
+ 			setup_syscall_restart(regs);
+ 		}
++
++		/* If there's no signal to deliver, we just put the saved sigmask
++		 * back.
++		 */
++		if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
++			clear_thread_flag(TIF_RESTORE_SIGMASK);
++			sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
++		}
+ 	}
+ 	single_step_set(current);
+-	return 0;
+ }
+ 
+ asmlinkage void
+ do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
+ {
+ 	if (thread_flags & _TIF_SIGPENDING)
+-		do_signal(&current->blocked, regs, syscall);
++		do_signal(regs, syscall);
+ }
+
+-------------------------------------------------------------------
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