diff options
Diffstat (limited to 'target/linux/goldfish/patches-2.6.30/0060--ARM-Add-code-to-prevent-system-calls-from-being-re.patch')
| -rw-r--r-- | target/linux/goldfish/patches-2.6.30/0060--ARM-Add-code-to-prevent-system-calls-from-being-re.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0060--ARM-Add-code-to-prevent-system-calls-from-being-re.patch b/target/linux/goldfish/patches-2.6.30/0060--ARM-Add-code-to-prevent-system-calls-from-being-re.patch new file mode 100644 index 0000000000..f0d33ed211 --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0060--ARM-Add-code-to-prevent-system-calls-from-being-re.patch @@ -0,0 +1,35 @@ +From d52bcb0a807dde87057f330dbe95aa6d221a4b85 Mon Sep 17 00:00:00 2001 +From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com> +Date: Mon, 9 Apr 2007 17:13:02 +0700 +Subject: [PATCH 060/134] [ARM] Add code to prevent system calls from being restarted muliple times before returning from the kernel. + +Fixes crashes with thumb syscalls. +--- + arch/arm/kernel/signal.c | 9 +++++++++ + 1 files changed, 9 insertions(+), 0 deletions(-) + +--- a/arch/arm/kernel/signal.c ++++ b/arch/arm/kernel/signal.c +@@ -534,6 +534,14 @@ setup_rt_frame(int usig, struct k_sigact + + static inline void restart_syscall(struct pt_regs *regs) + { ++ if (regs->ARM_ORIG_r0 == -ERESTARTNOHAND || ++ regs->ARM_ORIG_r0 == -ERESTARTSYS || ++ regs->ARM_ORIG_r0 == -ERESTARTNOINTR || ++ regs->ARM_ORIG_r0 == -ERESTART_RESTARTBLOCK) { ++ /* the syscall cannot be safely restarted, return -EINTR instead */ ++ regs->ARM_r0 = -EINTR; ++ return; ++ } + regs->ARM_r0 = regs->ARM_ORIG_r0; + regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; + } +@@ -650,6 +658,7 @@ static int do_signal(sigset_t *oldset, s + */ + if (syscall) { + if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) { ++ regs->ARM_r0 = -EAGAIN; /* prevent multiple restarts */ + if (thumb_mode(regs)) { + regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; + regs->ARM_pc -= 2; |