ppc: kvm: use anon_inode_getfd() with O_CLOEXEC flag

KVM uses anon_inode_get() to allocate file descriptors as part
of some of its ioctls. But those ioctls are lacking a flag argument
allowing userspace to choose options for the newly opened file descriptor.

In such case it's advised to use O_CLOEXEC by default so that
userspace is allowed to choose, without race, if the file descriptor
is going to be inherited across exec().

This patch set O_CLOEXEC flag on all file descriptors created
with anon_inode_getfd() to not leak file descriptors across exec().

Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Link: http://lkml.kernel.org/r/cover.1377372576.git.ydroneaud@opteya.com
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Yann Droneaud 2013-08-24 22:14:08 +02:00 коммит произвёл Gleb Natapov
Родитель 24009b0549
Коммит 2f84d5ea6f
3 изменённых файлов: 3 добавлений и 3 удалений

Просмотреть файл

@ -1579,7 +1579,7 @@ int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf)
ctx->first_pass = 1; ctx->first_pass = 1;
rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY; rwflag = (ghf->flags & KVM_GET_HTAB_WRITE) ? O_WRONLY : O_RDONLY;
ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag); ret = anon_inode_getfd("kvm-htab", &kvm_htab_fops, ctx, rwflag | O_CLOEXEC);
if (ret < 0) { if (ret < 0) {
kvm_put_kvm(kvm); kvm_put_kvm(kvm);
return ret; return ret;

Просмотреть файл

@ -136,7 +136,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
mutex_unlock(&kvm->lock); mutex_unlock(&kvm->lock);
return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops, return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
stt, O_RDWR); stt, O_RDWR | O_CLOEXEC);
fail: fail:
if (stt) { if (stt) {

Просмотреть файл

@ -1556,7 +1556,7 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
if (!ri) if (!ri)
return -ENOMEM; return -ENOMEM;
fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR); fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR | O_CLOEXEC);
if (fd < 0) if (fd < 0)
kvm_release_rma(ri); kvm_release_rma(ri);