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Use atomics when checking for parent setgid in VFS2 tmpfs file creation.

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Reported-by: syzbot+59550b48e06cc0d3b638@syzkaller.appspotmail.com
PiperOrigin-RevId: 386075453
This commit is contained in:
Jamie Liu
2021-07-21 12:54:34 -07:00
committed by gVisor bot
parent a4d743db59
commit a89b2f005b
1 changed files with 2 additions and 2 deletions
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pkg/sentry/fsimpl/tmpfs/tmpfs.go
+2 -2
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@@ -397,8 +397,8 @@ func (i *inode) init(impl interface{}, fs *filesystem, kuid auth.KUID, kgid auth
}
// Inherit the group and setgid bit as in fs/inode.c:inode_init_owner().
if parentDir != nil && parentDir.inode.mode&linux.S_ISGID == linux.S_ISGID {
kgid = auth.KGID(parentDir.inode.gid)
if parentDir != nil && atomic.LoadUint32(&parentDir.inode.mode)&linux.S_ISGID == linux.S_ISGID {
kgid = auth.KGID(atomic.LoadUint32(&parentDir.inode.gid))
if mode&linux.S_IFDIR == linux.S_IFDIR {
mode |= linux.S_ISGID
}