exec: copy-and-paste the fixes into compat_do_execve() paths

commit 114279be2120a916e8a04feeb2ac976a10016f2f upstream.

Note: this patch targets 2.6.37 and tries to be as simple as possible.
That is why it adds more copy-and-paste horror into fs/compat.c and
uglifies fs/exec.c, this will be cleanuped later.

compat_copy_strings() plays with bprm->vma/mm directly and thus has
two problems: it lacks the RLIMIT_STACK check and argv/envp memory
is not visible to oom killer.

Export acct_arg_size() and get_arg_page(), change compat_copy_strings()
to use get_arg_page(), change compat_do_execve() to do acct_arg_size(0)
as do_execve() does.

Add the fatal_signal_pending/cond_resched checks into compat_count() and
compat_copy_strings(), this matches the code in fs/exec.c and certainly
makes sense.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Moritz Muehlenhoff <jmm@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/compat.c b/fs/compat.c
index a53216d73cbc714a0b12e8d06c80d6bdb0645112..93b8ebf040b739e14e003535cae8c466ef2cae92 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1241,6 +1241,10 @@ static int compat_count(compat_uptr_t __user *argv, int max)
                        argv++;
                        if(++i > max)
                                return -E2BIG;
+
+                       if (fatal_signal_pending(current))
+                               return -ERESTARTNOHAND;
+                       cond_resched();
                }
        }
        return i;
@@ -1282,6 +1286,12 @@ static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
                while (len > 0) {
                        int offset, bytes_to_copy;
 
+                       if (fatal_signal_pending(current)) {
+                               ret = -ERESTARTNOHAND;
+                               goto out;
+                       }
+                       cond_resched();
+
                        offset = pos % PAGE_SIZE;
                        if (offset == 0)
                                offset = PAGE_SIZE;
@@ -1298,18 +1308,8 @@ static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
                        if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
                                struct page *page;
 
-#ifdef CONFIG_STACK_GROWSUP
-                               ret = expand_stack_downwards(bprm->vma, pos);
-                               if (ret < 0) {
-                                       /* We've exceed the stack rlimit. */
-                                       ret = -E2BIG;
-                                       goto out;
-                               }
-#endif
-                               ret = get_user_pages(current, bprm->mm, pos,
-                                                    1, 1, 1, &page, NULL);
-                               if (ret <= 0) {
-                                       /* We've exceed the stack rlimit. */
+                               page = get_arg_page(bprm, pos, 1);
+                               if (!page) {
                                        ret = -E2BIG;
                                        goto out;
                                }
@@ -1425,8 +1425,10 @@ out:
                security_bprm_free(bprm);
 
 out_mm:
-       if (bprm->mm)
+       if (bprm->mm) {
+               acct_arg_size(bprm, 0);
                mmput(bprm->mm);
+       }
 
 out_file:
        if (bprm->file) {

diff --git a/fs/exec.c b/fs/exec.c
index f08ebee3bb4a5783ef7a53f90d067b8c64312b04..56313f6e71e86a848a02f62079741ffd08228365 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -168,7 +168,7 @@ exit:
 
 #ifdef CONFIG_MMU
 
-static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
+void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
 {
        struct mm_struct *mm = current->mm;
        long diff = (long)(pages - bprm->vma_pages);
@@ -183,7 +183,7 @@ static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
        up_write(&mm->mmap_sem);
 }
 
-static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
+struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
                int write)
 {
        struct page *page;
@@ -308,11 +308,11 @@ static bool valid_arg_len(struct linux_binprm *bprm, long len)
 
 #else
 
-static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
+void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)
 {
 }
 
-static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
+struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
                int write)
 {
        struct page *page;

diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index a2e0013900ef3a522d73ea9670a3b4cd87049488..b79b90160862191717a8ffcac47da6dd9874be43 100644 (file)
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -53,6 +53,10 @@ struct linux_binprm{
        unsigned long loader, exec;
 };
 
+extern void acct_arg_size(struct linux_binprm *bprm, unsigned long pages);
+extern struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
+                                       int write);
+
 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)