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authorHugh Dickins <hugh@veritas.com>2005-09-14 06:13:02 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-14 11:18:13 -0700
commit2fd4ef85e0db9ed75c98e13953257a967ea55e03 (patch)
tree119dfe9f88a832f3db6ff66e631112626f268f18 /fs
parentfb085cf1d4294824571815d487daccc0609543f0 (diff)
downloadop-kernel-dev-2fd4ef85e0db9ed75c98e13953257a967ea55e03.zip
op-kernel-dev-2fd4ef85e0db9ed75c98e13953257a967ea55e03.tar.gz
[PATCH] error path in setup_arg_pages() misses vm_unacct_memory()
Pavel Emelianov and Kirill Korotaev observe that fs and arch users of security_vm_enough_memory tend to forget to vm_unacct_memory when a failure occurs further down (typically in setup_arg_pages variants). These are all users of insert_vm_struct, and that reservation will only be unaccounted on exit if the vma is marked VM_ACCOUNT: which in some cases it is (hidden inside VM_STACK_FLAGS) and in some cases it isn't. So x86_64 32-bit and ppc64 vDSO ELFs have been leaking memory into Committed_AS each time they're run. But don't add VM_ACCOUNT to them, it's inappropriate to reserve against the very unlikely case that gdb be used to COW a vDSO page - we ought to do something about that in do_wp_page, but there are yet other inconsistencies to be resolved. The safe and economical way to fix this is to let insert_vm_struct do the security_vm_enough_memory check when it finds VM_ACCOUNT is set. And the MIPS irix_brk has been calling security_vm_enough_memory before calling do_brk which repeats it, doubly accounting and so also leaking. Remove that, and all the fs and arch calls to security_vm_enough_memory: give it a less misleading name later on. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-Off-By: Kirill Korotaev <dev@sw.ru> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 6fae59a..a04a575 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -421,11 +421,6 @@ int setup_arg_pages(struct linux_binprm *bprm,
if (!mpnt)
return -ENOMEM;
- if (security_vm_enough_memory(arg_size >> PAGE_SHIFT)) {
- kmem_cache_free(vm_area_cachep, mpnt);
- return -ENOMEM;
- }
-
memset(mpnt, 0, sizeof(*mpnt));
down_write(&mm->mmap_sem);
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