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authorKees Cook <keescook@chromium.org>2018-04-10 16:35:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 10:28:37 -0700
commitc31dbb146dd44af44bc60780ce8fa7a9f5f746df (patch)
treeac3f22913cec3082511ab9143d153ad30975a884 /fs/exec.c
parentb83838313386f617d6bd8201be7f5b532059bba1 (diff)
exec: pin stack limit during exec
Since the stack rlimit is used in multiple places during exec and it can be changed via other threads (via setrlimit()) or processes (via prlimit()), the assumption that the value doesn't change cannot be made. This leads to races with mm layout selection and argument size calculations. This changes the exec path to use the rlimit stored in bprm instead of in current. Before starting the thread, the bprm stack rlimit is stored back to current. Link: http://lkml.kernel.org/r/1518638796-20819-4-git-send-email-keescook@chromium.org Fixes: 64701dee4178e ("exec: Use sane stack rlimit under secureexec") Signed-off-by: Kees Cook <keescook@chromium.org> Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Reported-by: Andy Lutomirski <luto@kernel.org> Reported-by: Brad Spengler <spender@grsecurity.net> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Greg KH <greg@kroah.com> Cc: Hugh Dickins <hughd@google.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Willy Tarreau <w@1wt.eu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c27
1 files changed, 15 insertions, 12 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 422ad79a7a03..183059c427b9 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -257,7 +257,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
* to work from.
*/
limit = _STK_LIM / 4 * 3;
- limit = min(limit, rlimit(RLIMIT_STACK) / 4);
+ limit = min(limit, bprm->rlim_stack.rlim_cur / 4);
if (size > limit)
goto fail;
}
@@ -411,6 +411,11 @@ static int bprm_mm_init(struct linux_binprm *bprm)
if (!mm)
goto err;
+ /* Save current stack limit for all calculations made during exec. */
+ task_lock(current->group_leader);
+ bprm->rlim_stack = current->signal->rlim[RLIMIT_STACK];
+ task_unlock(current->group_leader);
+
err = __bprm_mm_init(bprm);
if (err)
goto err;
@@ -697,7 +702,7 @@ int setup_arg_pages(struct linux_binprm *bprm,
#ifdef CONFIG_STACK_GROWSUP
/* Limit stack size */
- stack_base = rlimit_max(RLIMIT_STACK);
+ stack_base = bprm->rlim_stack.rlim_max;
if (stack_base > STACK_SIZE_MAX)
stack_base = STACK_SIZE_MAX;
@@ -770,7 +775,7 @@ int setup_arg_pages(struct linux_binprm *bprm,
* Align this down to a page boundary as expand_stack
* will align it up.
*/
- rlim_stack = rlimit(RLIMIT_STACK) & PAGE_MASK;
+ rlim_stack = bprm->rlim_stack.rlim_cur & PAGE_MASK;
#ifdef CONFIG_STACK_GROWSUP
if (stack_size + stack_expand > rlim_stack)
stack_base = vma->vm_start + rlim_stack;
@@ -1323,8 +1328,6 @@ EXPORT_SYMBOL(would_dump);
void setup_new_exec(struct linux_binprm * bprm)
{
- struct rlimit rlim_stack;
-
/*
* Once here, prepare_binrpm() will not be called any more, so
* the final state of setuid/setgid/fscaps can be merged into the
@@ -1343,15 +1346,11 @@ void setup_new_exec(struct linux_binprm * bprm)
* RLIMIT_STACK, but after the point of no return to avoid
* needing to clean up the change on failure.
*/
- if (current->signal->rlim[RLIMIT_STACK].rlim_cur > _STK_LIM)
- current->signal->rlim[RLIMIT_STACK].rlim_cur = _STK_LIM;
+ if (bprm->rlim_stack.rlim_cur > _STK_LIM)
+ bprm->rlim_stack.rlim_cur = _STK_LIM;
}
- task_lock(current->group_leader);
- rlim_stack = current->signal->rlim[RLIMIT_STACK];
- task_unlock(current->group_leader);
-
- arch_pick_mmap_layout(current->mm, &rlim_stack);
+ arch_pick_mmap_layout(current->mm, &bprm->rlim_stack);
current->sas_ss_sp = current->sas_ss_size = 0;
@@ -1387,6 +1386,10 @@ EXPORT_SYMBOL(setup_new_exec);
/* Runs immediately before start_thread() takes over. */
void finalize_exec(struct linux_binprm *bprm)
{
+ /* Store any stack rlimit changes before starting thread. */
+ task_lock(current->group_leader);
+ current->signal->rlim[RLIMIT_STACK] = bprm->rlim_stack;
+ task_unlock(current->group_leader);
}
EXPORT_SYMBOL(finalize_exec);