diff options
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 76459616a7f..89fc354156c 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -43,7 +43,7 @@ #include <linux/mount.h> #include <linux/ipc_namespace.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include "util.h" @@ -493,7 +493,11 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) if (size < SHMMIN || size > ns->shm_ctlmax) return -EINVAL; - if (ns->shm_tot + numpages > ns->shm_ctlall) + if (numpages << PAGE_SHIFT < size) + return -ENOSPC; + + if (ns->shm_tot + numpages < ns->shm_tot || + ns->shm_tot + numpages > ns->shm_ctlall) return -ENOSPC; shp = ipc_rcu_alloc(sizeof(*shp)); @@ -609,15 +613,15 @@ static inline int shm_more_checks(struct kern_ipc_perm *ipcp, SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg) { struct ipc_namespace *ns; - struct ipc_ops shm_ops; + static const struct ipc_ops shm_ops = { + .getnew = newseg, + .associate = shm_security, + .more_checks = shm_more_checks, + }; struct ipc_params shm_params; ns = current->nsproxy->ipc_ns; - shm_ops.getnew = newseg; - shm_ops.associate = shm_security; - shm_ops.more_checks = shm_more_checks; - shm_params.key = key; shm_params.flg = shmflg; shm_params.u.size = size; @@ -694,7 +698,7 @@ static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminf out.shmmin = in->shmmin; out.shmmni = in->shmmni; out.shmseg = in->shmseg; - out.shmall = in->shmall; + out.shmall = in->shmall; return copy_to_user(buf, &out, sizeof(out)); } @@ -1160,6 +1164,9 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr, down_write(¤t->mm->mmap_sem); if (addr && !(shmflg & SHM_REMAP)) { err = -EINVAL; + if (addr + size < addr) + goto invalid; + if (find_vma_intersection(current->mm, addr, addr + size)) goto invalid; /* |