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linux_dsm_epyc7002/fs/cifs/cifs_debug.c
Jeff Layton 52dfb446db cifs: try to handle the MUST SecurityFlags sanely 
The cifs.ko SecurityFlags interface wins my award for worst-designed
interface ever, but we're sort of stuck with it since it's documented
and people do use it (even if it doesn't work correctly).

Case in point -- you can specify multiple sets of "MUST" flags. It makes
absolutely no sense, but you can do it.

What should the effect be in such a case? No one knows or seems to have
considered this so far, so let's define it now. If you try to specify
multiple MUST flags, clear any other MAY or MUST bits except for the
ones that involve signing.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-26 17:31:55 -05:00

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/*
* fs/cifs_debug.c
*
* Copyright (C) International Business Machines Corp., 2000,2005
*
* Modified by Steve French (sfrench@us.ibm.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
void
cifs_dump_mem(char *label, void *data, int length)
{
int i, j;
int *intptr = data;
char *charptr = data;
char buf[10], line[80];
printk(KERN_DEBUG "%s: dump of %d bytes of data at 0x%p\n",
label, length, data);
for (i = 0; i < length; i += 16) {
line[0] = 0;
for (j = 0; (j < 4) && (i + j * 4 < length); j++) {
sprintf(buf, " %08x", intptr[i / 4 + j]);
strcat(line, buf);
}
buf[0] = ' ';
buf[2] = 0;
for (j = 0; (j < 16) && (i + j < length); j++) {
buf[1] = isprint(charptr[i + j]) ? charptr[i + j] : '.';
strcat(line, buf);
}
printk(KERN_DEBUG "%s\n", line);
}
}
#ifdef CONFIG_CIFS_DEBUG
void cifs_vfs_err(const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_ERR "CIFS VFS: %pV", &vaf);
va_end(args);
}
#endif
void cifs_dump_detail(void *buf)
{
#ifdef CONFIG_CIFS_DEBUG2
struct smb_hdr *smb = (struct smb_hdr *)buf;
cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
smb->Command, smb->Status.CifsError,
smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
cifs_dbg(VFS, "smb buf %p len %u\n", smb, smbCalcSize(smb));
#endif /* CONFIG_CIFS_DEBUG2 */
}
void cifs_dump_mids(struct TCP_Server_Info *server)
{
#ifdef CONFIG_CIFS_DEBUG2
struct list_head *tmp;
struct mid_q_entry *mid_entry;
if (server == NULL)
return;
cifs_dbg(VFS, "Dump pending requests:\n");
spin_lock(&GlobalMid_Lock);
list_for_each(tmp, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
mid_entry->mid_state,
le16_to_cpu(mid_entry->command),
mid_entry->pid,
mid_entry->callback_data,
mid_entry->mid);
#ifdef CONFIG_CIFS_STATS2
cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
mid_entry->large_buf,
mid_entry->resp_buf,
mid_entry->when_received,
jiffies);
#endif /* STATS2 */
cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
mid_entry->multiRsp, mid_entry->multiEnd);
if (mid_entry->resp_buf) {
cifs_dump_detail(mid_entry->resp_buf);
cifs_dump_mem("existing buf: ",
mid_entry->resp_buf, 62);
}
}
spin_unlock(&GlobalMid_Lock);
#endif /* CONFIG_CIFS_DEBUG2 */
}
#ifdef CONFIG_PROC_FS
static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
{
struct list_head *tmp1, *tmp2, *tmp3;
struct mid_q_entry *mid_entry;
struct TCP_Server_Info *server;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
int i, j;
__u32 dev_type;
seq_puts(m,
"Display Internal CIFS Data Structures for Debugging\n"
"---------------------------------------------------\n");
seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
seq_printf(m, "Features:");
#ifdef CONFIG_CIFS_DFS_UPCALL
seq_printf(m, " dfs");
#endif
#ifdef CONFIG_CIFS_FSCACHE
seq_printf(m, " fscache");
#endif
#ifdef CONFIG_CIFS_WEAK_PW_HASH
seq_printf(m, " lanman");
#endif
#ifdef CONFIG_CIFS_POSIX
seq_printf(m, " posix");
#endif
#ifdef CONFIG_CIFS_UPCALL
seq_printf(m, " spnego");
#endif
#ifdef CONFIG_CIFS_XATTR
seq_printf(m, " xattr");
#endif
#ifdef CONFIG_CIFS_ACL
seq_printf(m, " acl");
#endif
seq_putc(m, '\n');
seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
seq_printf(m, "Servers:");
i = 0;
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
i++;
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifs_ses,
smb_ses_list);
if ((ses->serverDomain == NULL) ||
(ses->serverOS == NULL) ||
(ses->serverNOS == NULL)) {
seq_printf(m, "\n%d) entry for %s not fully "
"displayed\n\t", i, ses->serverName);
} else {
seq_printf(m,
"\n%d) Name: %s Domain: %s Uses: %d OS:"
" %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
" session status: %d\t",
i, ses->serverName, ses->serverDomain,
ses->ses_count, ses->serverOS, ses->serverNOS,
ses->capabilities, ses->status);
}
seq_printf(m, "TCP status: %d\n\tLocal Users To "
"Server: %d SecMode: 0x%x Req On Wire: %d",
server->tcpStatus, server->srv_count,
server->sec_mode, in_flight(server));
#ifdef CONFIG_CIFS_STATS2
seq_printf(m, " In Send: %d In MaxReq Wait: %d",
atomic_read(&server->in_send),
atomic_read(&server->num_waiters));
#endif
seq_puts(m, "\n\tShares:");
j = 0;
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3, struct cifs_tcon,
tcon_list);
++j;
dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
tcon->treeName, tcon->tc_count);
if (tcon->nativeFileSystem) {
seq_printf(m, "Type: %s ",
tcon->nativeFileSystem);
}
seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
"\n\tPathComponentMax: %d Status: 0x%d",
le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
le32_to_cpu(tcon->fsAttrInfo.Attributes),
le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
tcon->tidStatus);
if (dev_type == FILE_DEVICE_DISK)
seq_puts(m, " type: DISK ");
else if (dev_type == FILE_DEVICE_CD_ROM)
seq_puts(m, " type: CDROM ");
else
seq_printf(m, " type: %d ", dev_type);
if (server->ops->dump_share_caps)
server->ops->dump_share_caps(m, tcon);
if (tcon->need_reconnect)
seq_puts(m, "\tDISCONNECTED ");
seq_putc(m, '\n');
}
seq_puts(m, "\n\tMIDs:\n");
spin_lock(&GlobalMid_Lock);
list_for_each(tmp3, &server->pending_mid_q) {
mid_entry = list_entry(tmp3, struct mid_q_entry,
qhead);
seq_printf(m, "\tState: %d com: %d pid:"
" %d cbdata: %p mid %llu\n",
mid_entry->mid_state,
le16_to_cpu(mid_entry->command),
mid_entry->pid,
mid_entry->callback_data,
mid_entry->mid);
}
spin_unlock(&GlobalMid_Lock);
}
}
spin_unlock(&cifs_tcp_ses_lock);
seq_putc(m, '\n');
/* BB add code to dump additional info such as TCP session info now */
return 0;
}
static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_debug_data_proc_show, NULL);
}
static const struct file_operations cifs_debug_data_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_debug_data_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#ifdef CONFIG_CIFS_STATS
static ssize_t cifs_stats_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
struct list_head *tmp1, *tmp2, *tmp3;
struct TCP_Server_Info *server;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
#ifdef CONFIG_CIFS_STATS2
atomic_set(&totBufAllocCount, 0);
atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifs_ses,
smb_ses_list);
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3,
struct cifs_tcon,
tcon_list);
atomic_set(&tcon->num_smbs_sent, 0);
if (server->ops->clear_stats)
server->ops->clear_stats(tcon);
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
}
return count;
}
static int cifs_stats_proc_show(struct seq_file *m, void *v)
{
int i;
struct list_head *tmp1, *tmp2, *tmp3;
struct TCP_Server_Info *server;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
seq_printf(m,
"Resources in use\nCIFS Session: %d\n",
sesInfoAllocCount.counter);
seq_printf(m, "Share (unique mount targets): %d\n",
tconInfoAllocCount.counter);
seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
bufAllocCount.counter,
cifs_min_rcv + tcpSesAllocCount.counter);
seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
smBufAllocCount.counter, cifs_min_small);
#ifdef CONFIG_CIFS_STATS2
seq_printf(m, "Total Large %d Small %d Allocations\n",
atomic_read(&totBufAllocCount),
atomic_read(&totSmBufAllocCount));
#endif /* CONFIG_CIFS_STATS2 */
seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
seq_printf(m,
"\n%d session %d share reconnects\n",
tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
seq_printf(m,
"Total vfs operations: %d maximum at one time: %d\n",
GlobalCurrentXid, GlobalMaxActiveXid);
i = 0;
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifs_ses,
smb_ses_list);
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3,
struct cifs_tcon,
tcon_list);
i++;
seq_printf(m, "\n%d) %s", i, tcon->treeName);
if (tcon->need_reconnect)
seq_puts(m, "\tDISCONNECTED ");
seq_printf(m, "\nSMBs: %d",
atomic_read(&tcon->num_smbs_sent));
if (server->ops->print_stats)
server->ops->print_stats(m, tcon);
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
seq_putc(m, '\n');
return 0;
}
static int cifs_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_stats_proc_show, NULL);
}
static const struct file_operations cifs_stats_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_stats_proc_write,
};
#endif /* STATS */
static struct proc_dir_entry *proc_fs_cifs;
static const struct file_operations cifsFYI_proc_fops;
static const struct file_operations cifs_lookup_cache_proc_fops;
static const struct file_operations traceSMB_proc_fops;
static const struct file_operations cifs_security_flags_proc_fops;
static const struct file_operations cifs_linux_ext_proc_fops;
void
cifs_proc_init(void)
{
proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
if (proc_fs_cifs == NULL)
return;
proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
#ifdef CONFIG_CIFS_STATS
proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
#endif /* STATS */
proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
&cifs_linux_ext_proc_fops);
proc_create("SecurityFlags", 0, proc_fs_cifs,
&cifs_security_flags_proc_fops);
proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
&cifs_lookup_cache_proc_fops);
}
void
cifs_proc_clean(void)
{
if (proc_fs_cifs == NULL)
return;
remove_proc_entry("DebugData", proc_fs_cifs);
remove_proc_entry("cifsFYI", proc_fs_cifs);
remove_proc_entry("traceSMB", proc_fs_cifs);
#ifdef CONFIG_CIFS_STATS
remove_proc_entry("Stats", proc_fs_cifs);
#endif
remove_proc_entry("SecurityFlags", proc_fs_cifs);
remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
remove_proc_entry("fs/cifs", NULL);
}
static int cifsFYI_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", cifsFYI);
return 0;
}
static int cifsFYI_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifsFYI_proc_show, NULL);
}
static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
cifsFYI = 0;
else if (c == '1' || c == 'y' || c == 'Y')
cifsFYI = 1;
else if ((c > '1') && (c <= '9'))
cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
return count;
}
static const struct file_operations cifsFYI_proc_fops = {
.owner = THIS_MODULE,
.open = cifsFYI_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifsFYI_proc_write,
};
static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", linuxExtEnabled);
return 0;
}
static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_linux_ext_proc_show, NULL);
}
static ssize_t cifs_linux_ext_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
linuxExtEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
linuxExtEnabled = 1;
return count;
}
static const struct file_operations cifs_linux_ext_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_linux_ext_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_linux_ext_proc_write,
};
static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", lookupCacheEnabled);
return 0;
}
static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_lookup_cache_proc_show, NULL);
}
static ssize_t cifs_lookup_cache_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
lookupCacheEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
lookupCacheEnabled = 1;
return count;
}
static const struct file_operations cifs_lookup_cache_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_lookup_cache_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_lookup_cache_proc_write,
};
static int traceSMB_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", traceSMB);
return 0;
}
static int traceSMB_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, traceSMB_proc_show, NULL);
}
static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
traceSMB = 0;
else if (c == '1' || c == 'y' || c == 'Y')
traceSMB = 1;
return count;
}
static const struct file_operations traceSMB_proc_fops = {
.owner = THIS_MODULE,
.open = traceSMB_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = traceSMB_proc_write,
};
static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "0x%x\n", global_secflags);
return 0;
}
static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_security_flags_proc_show, NULL);
}
/*
* Ensure that if someone sets a MUST flag, that we disable all other MAY
* flags except for the ones corresponding to the given MUST flag. If there are
* multiple MUST flags, then try to prefer more secure ones.
*/
static void
cifs_security_flags_handle_must_flags(unsigned int *flags)
{
unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
*flags = CIFSSEC_MUST_KRB5;
else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
*flags = CIFSSEC_MUST_NTLMSSP;
else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
*flags = CIFSSEC_MUST_NTLMV2;
else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
*flags = CIFSSEC_MUST_NTLM;
else if ((*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
*flags = CIFSSEC_MUST_LANMAN;
else if ((*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
*flags = CIFSSEC_MUST_PLNTXT;
*flags |= signflags;
}
static ssize_t cifs_security_flags_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
int rc;
unsigned int flags;
char flags_string[12];
char c;
if ((count < 1) || (count > 11))
return -EINVAL;
memset(flags_string, 0, 12);
if (copy_from_user(flags_string, buffer, count))
return -EFAULT;
if (count < 3) {
/* single char or single char followed by null */
c = flags_string[0];
if (c == '0' || c == 'n' || c == 'N') {
global_secflags = CIFSSEC_DEF; /* default */
return count;
} else if (c == '1' || c == 'y' || c == 'Y') {
global_secflags = CIFSSEC_MAX;
return count;
} else if (!isdigit(c)) {
cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
flags_string);
return -EINVAL;
}
}
/* else we have a number */
rc = kstrtouint(flags_string, 0, &flags);
if (rc) {
cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
flags_string);
return rc;
}
cifs_dbg(FYI, "sec flags 0x%x\n", flags);
if (flags == 0) {
cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
return -EINVAL;
}
if (flags & ~CIFSSEC_MASK) {
cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
flags & ~CIFSSEC_MASK);
return -EINVAL;
}
cifs_security_flags_handle_must_flags(&flags);
/* flags look ok - update the global security flags for cifs module */
global_secflags = flags;
if (global_secflags & CIFSSEC_MUST_SIGN) {
/* requiring signing implies signing is allowed */
global_secflags |= CIFSSEC_MAY_SIGN;
cifs_dbg(FYI, "packet signing now required\n");
} else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
cifs_dbg(FYI, "packet signing disabled\n");
}
/* BB should we turn on MAY flags for other MUST options? */
return count;
}
static const struct file_operations cifs_security_flags_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_security_flags_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_security_flags_proc_write,
};
#else
inline void cifs_proc_init(void)
{
}
inline void cifs_proc_clean(void)
{
}
#endif /* PROC_FS */
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