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authorOleg Nesterov <oleg@redhat.com>2010-11-30 20:56:02 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-30 17:56:38 -0800
commit114279be2120a916e8a04feeb2ac976a10016f2f (patch)
tree866a5dfab411d18941d58f8796edab6da760213e /fs
parent3c77f845722158206a7209c45ccddc264d19319c (diff)
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exec: copy-and-paste the fixes into compat_do_execve() paths
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> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/compat.c28
-rw-r--r--fs/exec.c8
2 files changed, 19 insertions, 17 deletions
diff --git a/fs/compat.c b/fs/compat.c
index c580c322fa6..eb1740ac8c0 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1350,6 +1350,10 @@ 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;
@@ -1391,6 +1395,12 @@ 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;
@@ -1407,18 +1417,8 @@ 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;
}
@@ -1539,8 +1539,10 @@ int compat_do_execve(char * filename,
return retval;
out:
- 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 4303b9035fe..d68c378a313 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -164,7 +164,7 @@ out:
#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)
#endif
}
-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;
@@ -297,11 +297,11 @@ 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;