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* [glibc/azanella/pthread-multiple-fixes] nptl: alpha: Fix Race conditions in pthread cancellation [BZ#12683]
@ 2021-06-08 20:49 Adhemerval Zanella
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From: Adhemerval Zanella @ 2021-06-08 20:49 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b7c4566e0e234e7208df7438dc80a95f7d374604
commit b7c4566e0e234e7208df7438dc80a95f7d374604
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Jan 9 12:03:28 2019 -0200
nptl: alpha: Fix Race conditions in pthread cancellation [BZ#12683]
This patch adds the alpha modifications required for the BZ#12683 fix
by adding the arch-specific cancellation syscall bridge.
Checked on alpha-linux-gnu.
Diff:
---
sysdeps/alpha/nptl/tcb-offsets.sym | 3 +
sysdeps/unix/sysv/linux/alpha/syscall_cancel.S | 80 ++++++++++++++++++++++++++
2 files changed, 83 insertions(+)
diff --git a/sysdeps/alpha/nptl/tcb-offsets.sym b/sysdeps/alpha/nptl/tcb-offsets.sym
index 1005621b37..15f2042278 100644
--- a/sysdeps/alpha/nptl/tcb-offsets.sym
+++ b/sysdeps/alpha/nptl/tcb-offsets.sym
@@ -11,3 +11,6 @@
MULTIPLE_THREADS_OFFSET thread_offsetof (header.multiple_threads)
TID_OFFSET thread_offsetof (tid)
+
+-- Not strictly offsets, used on syscall_cancel.S
+TCB_CANCELED_BITMASK CANCELED_BITMASK
diff --git a/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S b/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S
new file mode 100644
index 0000000000..e3726688fb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S
@@ -0,0 +1,80 @@
+/* Cancellable syscall wrapper. Linux/alpha version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+/* long int __syscall_cancel_arch (int *ch,
+ __syscall_arg_t nr,
+ __syscall_arg_t arg1,
+ __syscall_arg_t arg2,
+ __syscall_arg_t arg3,
+ __syscall_arg_t arg4,
+ __syscall_arg_t arg5,
+ __syscall_arg_t arg6) */
+
+ .set noreorder
+ .set noat
+ .set nomacro
+ENTRY (__syscall_cancel_arch)
+ .frame sp, 16, ra, 0
+ .mask 0x4000000,-16
+ cfi_startproc
+ ldah gp, 0(t12)
+ lda gp, 0(gp)
+ lda sp, -16(sp)
+ cfi_def_cfa_offset (16)
+ mov a1, v0
+ stq ra, 0(sp)
+ cfi_offset (26, -16)
+ .prologue 1
+
+ .global __syscall_cancel_arch_start
+__syscall_cancel_arch_start:
+ ldl t0, 0(a0)
+ addl zero, t0, t0
+ /* if (*ch & CANCELED_BITMASK) */
+ and t0, TCB_CANCELED_BITMASK, t0
+ bne t0, 1f
+ mov a2, a0
+ mov a3, a1
+ mov a4, a2
+ ldq a4, 16(sp)
+ mov a5, a3
+ ldq a5, 24(sp)
+ .set macro
+ callsys
+ .set nomacro
+
+ .global __syscall_cancel_arch_end
+__syscall_cancel_arch_end:
+ subq zero, v0, t0
+ ldq ra, 0(sp)
+ cmovne a3, t0, v0
+ lda sp, 16(sp)
+ cfi_remember_state
+ cfi_restore (26)
+ cfi_def_cfa_offset (0)
+ ret zero, (ra), 1
+ .align 4
+1:
+ cfi_restore_state
+ ldq t12, __do_cancel(gp) !literal!2
+ jsr ra, (t12), __cancel !lituse_jsr!2
+ cfi_endproc
+END (__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)
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2021-06-08 20:49 [glibc/azanella/pthread-multiple-fixes] nptl: alpha: Fix Race conditions in pthread cancellation [BZ#12683] Adhemerval Zanella
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