@@ -442,6 +442,38 @@ put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
#endif
}
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define unsafe_put_compat_sigset(compat, set, label) do { \
+ compat_sigset_t __user *__c = compat; \
+ const sigset_t *__s = set; \
+ \
+ switch (_NSIG_WORDS) { \
+ case 4: \
+ unsafe_put_user(__s->sig[3] >> 32, &__c->sig[7], label); \
+ unsafe_put_user(__s->sig[3], &__c->sig[6], label); \
+ fallthrough; \
+ case 3: \
+ unsafe_put_user(__s->sig[2] >> 32, &__c->sig[5], label); \
+ unsafe_put_user(__s->sig[2], &__c->sig[4], label); \
+ fallthrough; \
+ case 2: \
+ unsafe_put_user(__s->sig[1] >> 32, &__c->sig[3], label); \
+ unsafe_put_user(__s->sig[1], &__c->sig[2], label); \
+ fallthrough; \
+ case 1: \
+ unsafe_put_user(__s->sig[0] >> 32, &__c->sig[1], label); \
+ unsafe_put_user(__s->sig[0], &__c->sig[0], label); \
+ } \
+} while (0)
+#else
+#define unsafe_put_compat_sigset(compat, set, label) do { \
+ compat_sigset_t __user *__c = compat; \
+ const sigset_t *__s = set; \
+ \
+ unsafe_copy_to_user(__c, __s, sizeof(*__c), label); \
+} while (0)
+#endif
+
extern int compat_ptrace_request(struct task_struct *child,
compat_long_t request,
compat_ulong_t addr, compat_ulong_t data);
Implement 'unsafe' version of put_compat_sigset() For the bigendian, use unsafe_put_user() directly to avoid intermediate copy through the stack. For the littleendian, use a straight unsafe_copy_to_user(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- include/linux/compat.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)