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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-20 14:24:26 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-12-19 18:07:41 -0500 |
| commit | c40702c49faef05ae324f121d8b3e215244ee152 (patch) | |
| tree | b0b2a51b07e944497da5cb48fb461963a3762cad /kernel | |
| parent | 9026843952adac5b123c7b8dc961e5c15828d9e1 (diff) | |
| download | lwn-c40702c49faef05ae324f121d8b3e215244ee152.tar.gz lwn-c40702c49faef05ae324f121d8b3e215244ee152.zip | |
new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those
note that they are relying on access_ok() already checked by caller.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/signal.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index aee85bd76b8a..f072513302c3 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -3117,6 +3117,14 @@ int restore_altstack(const stack_t __user *uss) return err == -EFAULT ? err : 0; } +int __save_altstack(stack_t __user *uss, unsigned long sp) +{ + struct task_struct *t = current; + return __put_user((void __user *)t->sas_ss_sp, &uss->ss_sp) | + __put_user(sas_ss_flags(sp), &uss->ss_flags) | + __put_user(t->sas_ss_size, &uss->ss_size); +} + #ifdef CONFIG_COMPAT #ifdef CONFIG_GENERIC_SIGALTSTACK asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr, @@ -3158,6 +3166,14 @@ int compat_restore_altstack(const compat_stack_t __user *uss) /* squash all but -EFAULT for now */ return err == -EFAULT ? err : 0; } + +int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp) +{ + struct task_struct *t = current; + return __put_user(ptr_to_compat((void __user *)t->sas_ss_sp), &uss->ss_sp) | + __put_user(sas_ss_flags(sp), &uss->ss_flags) | + __put_user(t->sas_ss_size, &uss->ss_size); +} #endif #endif |