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take security_mmap_file() outside of ->mmap_sem

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-05-30 17:11:23 -04:00
parent e5467859f7
commit 8b3ec6814c
5 changed files with 62 additions and 28 deletions
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5
ipc/shm.c
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@@ -1036,6 +1036,10 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
sfd->file = shp->shm_file;
sfd->vm_ops = NULL;
err = security_mmap_file(file, prot, flags);
if (err)
goto out_fput;
down_write(&current->mm->mmap_sem);
if (addr && !(shmflg & SHM_REMAP)) {
err = -EINVAL;
@@ -1058,6 +1062,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
invalid:
up_write(&current->mm->mmap_sem);
out_fput:
fput(file);
out_nattch: