Merge branch 'linus' into x86/xen

1 files changed, 60 insertions, 39 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 639d2d8b5710..3b6ff854d983 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -131,6 +131,15 @@ static int padzero(unsigned long elf_bss)
 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
 #endif
 
+#ifndef ELF_BASE_PLATFORM
+/*
+ * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
+ * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
+ * will be copied to the user stack in the same manner as AT_PLATFORM.
+ */
+#define ELF_BASE_PLATFORM NULL
+#endif
+
 static int
 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
                 unsigned long load_addr, unsigned long interp_load_addr)
@@ -142,7 +151,9 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
         elf_addr_t __user *envp;
         elf_addr_t __user *sp;
         elf_addr_t __user *u_platform;
+        elf_addr_t __user *u_base_platform;
         const char *k_platform = ELF_PLATFORM;
+        const char *k_base_platform = ELF_BASE_PLATFORM;
         int items;
         elf_addr_t *elf_info;
         int ei_index = 0;
@@ -172,6 +183,19 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
                         return -EFAULT;
         }
 
+        /*
+         * If this architecture has a "base" platform capability
+         * string, copy it to userspace.
+         */
+        u_base_platform = NULL;
+        if (k_base_platform) {
+                size_t len = strlen(k_base_platform) + 1;
+
+                u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
+                if (__copy_to_user(u_base_platform, k_base_platform, len))
+                        return -EFAULT;
+        }
+
         /* Create the ELF interpreter info */
         elf_info = (elf_addr_t *)current->mm->saved_auxv;
         /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
@@ -209,6 +233,10 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
                 NEW_AUX_ENT(AT_PLATFORM,
                             (elf_addr_t)(unsigned long)u_platform);
         }
+        if (k_base_platform) {
+                NEW_AUX_ENT(AT_BASE_PLATFORM,
+                            (elf_addr_t)(unsigned long)u_base_platform);
+        }
         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
         }
@@ -1478,7 +1506,7 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
         const struct user_regset_view *view = task_user_regset_view(dump_task);
         struct elf_thread_core_info *t;
         struct elf_prpsinfo *psinfo;
-        struct task_struct *g, *p;
+        struct core_thread *ct;
         unsigned int i;
 
         info->size = 0;
@@ -1517,31 +1545,26 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
         /*
          * Allocate a structure for each thread.
          */
-        rcu_read_lock();
-        do_each_thread(g, p)
-                if (p->mm == dump_task->mm) {
-                        t = kzalloc(offsetof(struct elf_thread_core_info,
-                                             notes[info->thread_notes]),
-                                    GFP_ATOMIC);
-                        if (unlikely(!t)) {
-                                rcu_read_unlock();
-                                return 0;
-                        }
-                        t->task = p;
-                        if (p == dump_task || !info->thread) {
-                                t->next = info->thread;
-                                info->thread = t;
-                        } else {
-                                /*
-                                 * Make sure to keep the original task at
-                                 * the head of the list.
-                                 */
-                                t->next = info->thread->next;
-                                info->thread->next = t;
-                        }
+        for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
+                t = kzalloc(offsetof(struct elf_thread_core_info,
+                                     notes[info->thread_notes]),
+                            GFP_KERNEL);
+                if (unlikely(!t))
+                        return 0;
+
+                t->task = ct->task;
+                if (ct->task == dump_task || !info->thread) {
+                        t->next = info->thread;
+                        info->thread = t;
+                } else {
+                        /*
+                         * Make sure to keep the original task at
+                         * the head of the list.
+                         */
+                        t->next = info->thread->next;
+                        info->thread->next = t;
                 }
-        while_each_thread(g, p);
-        rcu_read_unlock();
+        }
 
         /*
          * Now fill in each thread's information.
@@ -1688,7 +1711,6 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 {
 #define NUM_NOTES       6
         struct list_head *t;
-        struct task_struct *g, *p;
 
         info->notes = NULL;
         info->prstatus = NULL;
@@ -1720,20 +1742,19 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
 
         info->thread_status_size = 0;
         if (signr) {
+                struct core_thread *ct;
                 struct elf_thread_status *ets;
-                rcu_read_lock();
-                do_each_thread(g, p)
-                        if (current->mm == p->mm && current != p) {
-                                ets = kzalloc(sizeof(*ets), GFP_ATOMIC);
-                                if (!ets) {
-                                        rcu_read_unlock();
-                                        return 0;
-                                }
-                                ets->thread = p;
-                                list_add(&ets->list, &info->thread_list);
-                        }
-                while_each_thread(g, p);
-                rcu_read_unlock();
+
+                for (ct = current->mm->core_state->dumper.next;
+                                                ct; ct = ct->next) {
+                        ets = kzalloc(sizeof(*ets), GFP_KERNEL);
+                        if (!ets)
+                                return 0;
+
+                        ets->thread = ct->task;
+                        list_add(&ets->list, &info->thread_list);
+                }
+
                 list_for_each(t, &info->thread_list) {
                         int sz;