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Add kern_mmap_racct_check(), a helper to verify limits in vm_mmap*().
Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24652
This commit is contained in:
parent
fbf2a77876
commit
67a659d282
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=365486
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@ -62,6 +62,7 @@ struct sockaddr;
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struct stat;
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struct thr_param;
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struct uio;
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struct vm_map;
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typedef int (*mmap_check_fp_fn)(struct file *, int, int, int);
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@ -197,8 +198,10 @@ int kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr,
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size_t len);
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int kern_mmap(struct thread *td, uintptr_t addr, size_t len, int prot,
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int flags, int fd, off_t pos);
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int kern_mmap_req(struct thread *td, const struct mmap_req *mrp);
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int kern_mmap_racct_check(struct thread *td, struct vm_map *map,
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vm_size_t size);
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int kern_mmap_maxprot(struct proc *p, int prot);
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int kern_mmap_req(struct thread *td, const struct mmap_req *mrp);
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int kern_mprotect(struct thread *td, uintptr_t addr, size_t size, int prot);
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int kern_msgctl(struct thread *, int, int, struct msqid_ds *);
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int kern_msgrcv(struct thread *, int, void *, size_t, long, int, long *);
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@ -1509,6 +1509,39 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
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return (error);
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}
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int
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kern_mmap_racct_check(struct thread *td, vm_map_t map, vm_size_t size)
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{
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int error;
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RACCT_PROC_LOCK(td->td_proc);
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if (map->size + size > lim_cur(td, RLIMIT_VMEM)) {
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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if (ptoa(pmap_wired_count(map->pmap)) + size >
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lim_cur(td, RLIMIT_MEMLOCK)) {
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racct_set_force(td->td_proc, RACCT_VMEM, map->size);
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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error = racct_set(td->td_proc, RACCT_MEMLOCK,
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ptoa(pmap_wired_count(map->pmap)) + size);
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if (error != 0) {
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racct_set_force(td->td_proc, RACCT_VMEM, map->size);
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RACCT_PROC_UNLOCK(td->td_proc);
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return (error);
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}
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}
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RACCT_PROC_UNLOCK(td->td_proc);
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return (0);
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}
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/*
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* Internal version of mmap that maps a specific VM object into an
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* map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
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@ -1518,39 +1551,15 @@ vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
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vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
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boolean_t writecounted, struct thread *td)
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{
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boolean_t curmap, fitit;
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vm_offset_t max_addr;
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int docow, error, findspace, rv;
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bool curmap, fitit;
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curmap = map == &td->td_proc->p_vmspace->vm_map;
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if (curmap) {
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RACCT_PROC_LOCK(td->td_proc);
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if (map->size + size > lim_cur(td, RLIMIT_VMEM)) {
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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if (!old_mlock && map->flags & MAP_WIREFUTURE) {
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if (ptoa(pmap_wired_count(map->pmap)) + size >
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lim_cur(td, RLIMIT_MEMLOCK)) {
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racct_set_force(td->td_proc, RACCT_VMEM,
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map->size);
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RACCT_PROC_UNLOCK(td->td_proc);
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return (ENOMEM);
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}
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error = racct_set(td->td_proc, RACCT_MEMLOCK,
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ptoa(pmap_wired_count(map->pmap)) + size);
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if (error != 0) {
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racct_set_force(td->td_proc, RACCT_VMEM,
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map->size);
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RACCT_PROC_UNLOCK(td->td_proc);
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return (error);
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}
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}
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RACCT_PROC_UNLOCK(td->td_proc);
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error = kern_mmap_racct_check(td, map, size);
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if (error != 0)
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return (error);
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}
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/*
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