-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
*/
#include <linux/sched.h>
+#include <linux/fs_struct.h>
+
+#include <linux/compat.h>
+#include <linux/thread_info.h>
#define DEBUG_SUBSYSTEM S_LNET
uid_t cfs_curproc_uid(void)
{
- return current->uid;
+ return current_uid();
}
gid_t cfs_curproc_gid(void)
{
- return current->gid;
+ return current_gid();
}
uid_t cfs_curproc_fsuid(void)
{
- return current->fsuid;
+ return current_fsuid();
+}
+
+uid_t cfs_curproc_euid(void)
+{
+ return current_euid();
+}
+
+uid_t cfs_curproc_egid(void)
+{
+ return current_egid();
}
gid_t cfs_curproc_fsgid(void)
{
- return current->fsgid;
+ return current_fsgid();
}
pid_t cfs_curproc_pid(void)
{
int nr;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
task_lock(current);
- nr = current->group_info->ngroups;
+ nr = current_cred()->group_info->ngroups;
task_unlock(current);
-#else
- nr = current->ngroups;
-#endif
return nr;
}
void cfs_curproc_groups_dump(gid_t *array, int size)
{
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
task_lock(current);
- size = min_t(int, size, current->group_info->ngroups);
- memcpy(array, current->group_info->blocks[0], size * sizeof(__u32));
+ size = min_t(int, size, current_cred()->group_info->ngroups);
+ memcpy(array, current_cred()->group_info->blocks[0], size * sizeof(__u32));
task_unlock(current);
-#else
- LASSERT(size <= NGROUPS);
- size = min_t(int, size, current->ngroups);
- memcpy(array, current->groups, size * sizeof(__u32));
-#endif
}
void cfs_cap_raise(cfs_cap_t cap)
{
- cap_raise(cfs_current()->cap_effective, cfs_cap_unpack(cap));
+ struct cred *cred;
+ if ((cred = prepare_creds())) {
+ cap_raise(cred->cap_effective, cfs_cap_unpack(cap));
+ commit_creds(cred);
+ }
}
void cfs_cap_lower(cfs_cap_t cap)
{
- cap_lower(cfs_current()->cap_effective, cfs_cap_unpack(cap));
+ struct cred *cred;
+ if ((cred = prepare_creds())) {
+ cap_lower(cred->cap_effective, cfs_cap_unpack(cap));
+ commit_creds(cred);
+ }
}
int cfs_cap_raised(cfs_cap_t cap)
{
- return cap_raised(cfs_current()->cap_effective, cfs_cap_unpack(cap));
+ return cap_raised(current_cap(), cfs_cap_unpack(cap));
}
-cfs_cap_t cfs_curproc_cap_pack(void)
+void cfs_kernel_cap_pack(cfs_kernel_cap_t kcap, cfs_cap_t *cap)
{
#if defined (_LINUX_CAPABILITY_VERSION) && _LINUX_CAPABILITY_VERSION == 0x19980330
- return cfs_cap_pack(current->cap_effective);
+ *cap = cfs_cap_pack(kcap);
#elif defined (_LINUX_CAPABILITY_VERSION) && _LINUX_CAPABILITY_VERSION == 0x20071026
- return cfs_cap_pack(current->cap_effective[0]);
+ *cap = cfs_cap_pack(kcap[0]);
#elif defined(_KERNEL_CAPABILITY_VERSION) && _KERNEL_CAPABILITY_VERSION == 0x20080522
/* XXX lost high byte */
- return cfs_cap_pack(current->cap_effective.cap[0]);
+ *cap = cfs_cap_pack(kcap.cap[0]);
#else
#error "need correct _KERNEL_CAPABILITY_VERSION "
#endif
}
-void cfs_curproc_cap_unpack(cfs_cap_t cap)
+void cfs_kernel_cap_unpack(cfs_kernel_cap_t *kcap, cfs_cap_t cap)
{
#if defined (_LINUX_CAPABILITY_VERSION) && _LINUX_CAPABILITY_VERSION == 0x19980330
- current->cap_effective = cfs_cap_unpack(cap);
+ *kcap = cfs_cap_unpack(cap);
#elif defined (_LINUX_CAPABILITY_VERSION) && _LINUX_CAPABILITY_VERSION == 0x20071026
- current->cap_effective[0] = cfs_cap_unpack(cap);
+ (*kcap)[0] = cfs_cap_unpack(cap);
#elif defined(_KERNEL_CAPABILITY_VERSION) && _KERNEL_CAPABILITY_VERSION == 0x20080522
- current->cap_effective.cap[0] = cfs_cap_unpack(cap);
+ kcap->cap[0] = cfs_cap_unpack(cap);
#else
#error "need correct _KERNEL_CAPABILITY_VERSION "
#endif
}
+cfs_cap_t cfs_curproc_cap_pack(void)
+{
+ cfs_cap_t cap;
+ cfs_kernel_cap_pack(current_cap(), &cap);
+ return cap;
+}
+
+void cfs_curproc_cap_unpack(cfs_cap_t cap)
+{
+ struct cred *cred;
+ if ((cred = prepare_creds())) {
+ cfs_kernel_cap_unpack(&cred->cap_effective, cap);
+ commit_creds(cred);
+ }
+}
+
int cfs_capable(cfs_cap_t cap)
{
return capable(cfs_cap_unpack(cap));
}
+/* Check if task is running in 32-bit API mode, for the purpose of
+ * userspace binary interfaces. On 32-bit Linux this is (unfortunately)
+ * always true, even if the application is using LARGEFILE64 and 64-bit
+ * APIs, because Linux provides no way for the filesystem to know if it
+ * is called via 32-bit or 64-bit APIs. Other clients may vary. On
+ * 64-bit systems, this will only be true if the binary is calling a
+ * 32-bit system call. */
+int cfs_curproc_is_32bit(void)
+{
+#ifdef HAVE_IS_COMPAT_TASK
+ return is_compat_task();
+#else
+ return (BITS_PER_LONG == 32);
+#endif
+}
+
+static int cfs_access_process_vm(struct task_struct *tsk, unsigned long addr,
+ void *buf, int len, int write)
+{
+#ifdef HAVE_ACCESS_PROCESS_VM
+ return access_process_vm(tsk, addr, buf, len, write);
+#else
+ /* Just copied from kernel for the kernels which doesn't
+ * have access_process_vm() exported */
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
+ struct page *page;
+ void *old_buf = buf;
+
+ mm = get_task_mm(tsk);
+ if (!mm)
+ return 0;
+
+ down_read(&mm->mmap_sem);
+ /* ignore errors, just check how much was sucessfully transfered */
+ while (len) {
+ int bytes, ret, offset;
+ void *maddr;
+
+ ret = get_user_pages(tsk, mm, addr, 1,
+ write, 1, &page, &vma);
+ if (ret <= 0)
+ break;
+
+ bytes = len;
+ offset = addr & (PAGE_SIZE-1);
+ if (bytes > PAGE_SIZE-offset)
+ bytes = PAGE_SIZE-offset;
+
+ maddr = kmap(page);
+ if (write) {
+ copy_to_user_page(vma, page, addr,
+ maddr + offset, buf, bytes);
+ set_page_dirty_lock(page);
+ } else {
+ copy_from_user_page(vma, page, addr,
+ buf, maddr + offset, bytes);
+ }
+ kunmap(page);
+ page_cache_release(page);
+ len -= bytes;
+ buf += bytes;
+ addr += bytes;
+ }
+ up_read(&mm->mmap_sem);
+ mmput(mm);
+
+ return buf - old_buf;
+#endif /* HAVE_ACCESS_PROCESS_VM */
+}
+
+/* Read the environment variable of current process specified by @key. */
+int cfs_get_environ(const char *key, char *value, int *val_len)
+{
+ struct mm_struct *mm;
+ char *buffer, *tmp_buf = NULL;
+ int buf_len = CFS_PAGE_SIZE;
+ unsigned long addr;
+ int ret;
+ ENTRY;
+
+ buffer = (char *)cfs_alloc(buf_len, CFS_ALLOC_USER);
+ if (!buffer)
+ RETURN(-ENOMEM);
+
+ mm = get_task_mm(current);
+ if (!mm) {
+ cfs_free((void *)buffer);
+ RETURN(-EINVAL);
+ }
+
+ /* Avoid deadlocks on mmap_sem if called from sys_mmap_pgoff(),
+ * which is already holding mmap_sem for writes. If some other
+ * thread gets the write lock in the meantime, this thread will
+ * block, but at least it won't deadlock on itself. LU-1735 */
+ if (down_read_trylock(&mm->mmap_sem) == 0)
+ return -EDEADLK;
+ up_read(&mm->mmap_sem);
+
+ addr = mm->env_start;
+ ret = -ENOENT;
+
+ while (addr < mm->env_end) {
+ int this_len, retval, scan_len;
+ char *env_start, *env_end;
+
+ memset(buffer, 0, buf_len);
+
+ this_len = min((int)(mm->env_end - addr), buf_len);
+ retval = cfs_access_process_vm(current, addr, buffer,
+ this_len, 0);
+ if (retval != this_len)
+ break;
+
+ addr += retval;
+
+ /* Parse the buffer to find out the specified key/value pair.
+ * The "key=value" entries are separated by '\0'. */
+ env_start = buffer;
+ scan_len = this_len;
+ while (scan_len) {
+ char *entry;
+ int entry_len;
+
+ env_end = (char *)memscan(env_start, '\0', scan_len);
+ LASSERT(env_end >= env_start &&
+ env_end <= env_start + scan_len);
+
+ /* The last entry of this buffer cross the buffer
+ * boundary, reread it in next cycle. */
+ if (unlikely(env_end - env_start == scan_len)) {
+ /* This entry is too large to fit in buffer */
+ if (unlikely(scan_len == this_len)) {
+ CERROR("Too long env variable.\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ addr -= scan_len;
+ break;
+ }
+
+ entry = env_start;
+ entry_len = env_end - env_start;
+
+ /* Key length + length of '=' */
+ if (entry_len > strlen(key) + 1 &&
+ !memcmp(entry, key, strlen(key))) {
+ entry += (strlen(key) + 1);
+ entry_len -= (strlen(key) + 1);
+ /* The 'value' buffer passed in is too small.*/
+ if (entry_len >= *val_len) {
+ CERROR("Buffer is too small. "
+ "entry_len=%d buffer_len=%d\n",
+ entry_len, *val_len);
+ ret = -EOVERFLOW;
+ } else {
+ memcpy(value, entry, entry_len);
+ *val_len = entry_len;
+ ret = 0;
+ }
+ goto out;
+ }
+
+ scan_len -= (env_end - env_start + 1);
+ env_start = env_end + 1;
+ }
+ }
+out:
+ mmput(mm);
+ cfs_free((void *)buffer);
+ if (tmp_buf)
+ cfs_free((void *)tmp_buf);
+ RETURN(ret);
+}
+EXPORT_SYMBOL(cfs_get_environ);
+
EXPORT_SYMBOL(cfs_curproc_uid);
EXPORT_SYMBOL(cfs_curproc_pid);
+EXPORT_SYMBOL(cfs_curproc_euid);
EXPORT_SYMBOL(cfs_curproc_gid);
+EXPORT_SYMBOL(cfs_curproc_egid);
EXPORT_SYMBOL(cfs_curproc_fsuid);
EXPORT_SYMBOL(cfs_curproc_fsgid);
EXPORT_SYMBOL(cfs_curproc_umask);
EXPORT_SYMBOL(cfs_curproc_cap_pack);
EXPORT_SYMBOL(cfs_curproc_cap_unpack);
EXPORT_SYMBOL(cfs_capable);
+EXPORT_SYMBOL(cfs_curproc_is_32bit);
/*
* Local variables:
git://git.whamcloud.com / fs / lustre-release.git / blobdiff