Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754020Ab0BUHVs (ORCPT ); Sun, 21 Feb 2010 02:21:48 -0500 Received: from mail.windriver.com ([147.11.1.11]:59266 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753544Ab0BUHVq (ORCPT ); Sun, 21 Feb 2010 02:21:46 -0500 From: Dongdong Deng To: rusty@rustcorp.com.au, davem@davemloft.net Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, dongdong.deng@windriver.com, jason.wessel@windriver.com, lenb@kernel.org, dwmw2@infradead.org, mdharm-usb@one-eyed-alien.net, bfields@fieldses.org, robert.richter@amd.com Subject: [PATCH] module param_call: fix potential NULL pointer dereference Date: Sun, 21 Feb 2010 15:24:38 +0800 Message-Id: <1266737078-26186-1-git-send-email-dongdong.deng@windriver.com> X-Mailer: git-send-email 1.6.0.4 X-OriginalArrivalTime: 21 Feb 2010 07:18:35.0897 (UTC) FILETIME=[14FE7690:01CAB2C6] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11094 Lines: 342 The param_set_fn() function will get a parameter which is a NULL pointer when insmod module with params via following method: $insmod module.ko module_params BTW: the normal method usually as following format: $insmod module.ko module_params=example If the param_set_fn() function didn't check that parameter and used it directly, it could caused an OOPS due to NULL pointer dereference. The solution is simple: Just checking the parameter before using in param_set_fn(). Example: int set_module_params(const char *val, struct kernel_param *kp) { /*Checking the val parameter before using */ if (!val) return -EINVAL; ... } module_param_call(module_params, set_module_params, NULL, NULL, 0644); Signed-off-by: Dongdong Deng CC: Jason Wessel CC: Len Brown CC: David Woodhouse CC: Matthew Dharm CC: "J. Bruce Fields" CC: Robert Richter --- arch/powerpc/platforms/pseries/cmm.c | 7 ++++++- arch/x86/oprofile/nmi_int.c | 3 +++ drivers/acpi/debug.c | 3 +++ drivers/ide/ide.c | 13 ++++++++++++- drivers/infiniband/hw/ipath/ipath_init_chip.c | 3 +++ drivers/md/md.c | 9 ++++++++- drivers/misc/kgdbts.c | 7 ++++++- drivers/mtd/devices/block2mtd.c | 3 +++ drivers/mtd/devices/phram.c | 3 +++ drivers/pci/pcie/aspm.c | 3 +++ drivers/serial/kgdboc.c | 7 ++++++- drivers/usb/storage/libusual.c | 3 +++ fs/lockd/svc.c | 5 ++++- fs/nfs/idmap.c | 9 +++++++-- net/netfilter/nf_conntrack_core.c | 3 +++ net/sunrpc/svc.c | 3 +++ 16 files changed, 76 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c index a277f2e..4f87813 100644 --- a/arch/powerpc/platforms/pseries/cmm.c +++ b/arch/powerpc/platforms/pseries/cmm.c @@ -721,7 +721,12 @@ static void cmm_exit(void) **/ static int cmm_set_disable(const char *val, struct kernel_param *kp) { - int disable = simple_strtoul(val, NULL, 10); + int disable; + + if (!val) + return -EINVAL; + + disable = simple_strtoul(val, NULL, 10); if (disable != 0 && disable != 1) return -EINVAL; diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c index 3347f69..561e2fe 100644 --- a/arch/x86/oprofile/nmi_int.c +++ b/arch/x86/oprofile/nmi_int.c @@ -560,6 +560,9 @@ static int __init p4_init(char **cpu_type) static int force_arch_perfmon; static int force_cpu_type(const char *str, struct kernel_param *kp) { + if (!str) + return -EINVAL; + if (!strcmp(str, "arch_perfmon")) { force_arch_perfmon = 1; printk(KERN_INFO "oprofile: forcing architectural perfmon\n"); diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c index cc421b7..fbceafd 100644 --- a/drivers/acpi/debug.c +++ b/drivers/acpi/debug.c @@ -150,6 +150,9 @@ static int param_set_trace_state(const char *val, struct kernel_param *kp) { int result = 0; + if (!val) + return -EINVAL; + if (!strncmp(val, "enable", strlen("enable") - 1)) { result = acpi_debug_trace(trace_method_name, trace_debug_level, trace_debug_layer, 0); diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c index 16d0569..ce66d34 100644 --- a/drivers/ide/ide.c +++ b/drivers/ide/ide.c @@ -181,7 +181,12 @@ MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) { int a, b, i, j = 1; - unsigned int *dev_param_mask = (unsigned int *)kp->arg; + unsigned int *dev_param_mask; + + if (!s || !kp) + return -EINVAL; + + dev_param_mask = (unsigned int *)kp->arg; /* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */ if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && @@ -244,6 +249,9 @@ static int ide_set_disk_chs(const char *str, struct kernel_param *kp) { int a, b, c = 0, h = 0, s = 0, i, j = 1; + if (!str) + return -EINVAL; + /* controller . device (0 or 1) : Cylinders , Heads , Sectors */ /* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */ if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && @@ -328,6 +336,9 @@ static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) { int i, j = 1; + if (!s) + return -EINVAL; + /* controller (ignore) */ /* controller : 1 (ignore) | 0 (use) */ if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) diff --git a/drivers/infiniband/hw/ipath/ipath_init_chip.c b/drivers/infiniband/hw/ipath/ipath_init_chip.c index 077879c..2e21679 100644 --- a/drivers/infiniband/hw/ipath/ipath_init_chip.c +++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c @@ -1035,6 +1035,9 @@ static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp) unsigned short val; int ret; + if (!str) + return -EINVAL; + ret = ipath_parse_ushort(str, &val); spin_lock_irqsave(&ipath_devs_lock, flags); diff --git a/drivers/md/md.c b/drivers/md/md.c index a20a71e..61bc893 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4200,9 +4200,14 @@ static int add_named_array(const char *val, struct kernel_param *kp) * We allocate an array with a large free minor number, and * set the name to val. val must not already be an active name. */ - int len = strlen(val); + int len; char buf[DISK_NAME_LEN]; + if (!val) + return -EINVAL; + + len = strlen(val); + while (len && val[len-1] == '\n') len--; if (len >= DISK_NAME_LEN) @@ -7177,6 +7182,8 @@ static int get_ro(char *buffer, struct kernel_param *kp) static int set_ro(const char *val, struct kernel_param *kp) { char *e; + if (!val) + return -EINVAL; int num = simple_strtoul(val, &e, 10); if (*val && (*e == '\0' || *e == '\n')) { start_readonly = num; diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c index fcb6ec1..982abd1 100644 --- a/drivers/misc/kgdbts.c +++ b/drivers/misc/kgdbts.c @@ -1062,7 +1062,12 @@ static void kgdbts_put_char(u8 chr) static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp) { - int len = strlen(kmessage); + int len; + + if (!kmessage || !(len = strlen(kmessage))) { + printk(KERN_ERR "kgdbts: config string too short\n"); + return -ENOSPC; + } if (len >= MAX_CONFIG_LEN) { printk(KERN_ERR "kgdbts: config string too long\n"); diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c index 8c295f4..1dd9140 100644 --- a/drivers/mtd/devices/block2mtd.c +++ b/drivers/mtd/devices/block2mtd.c @@ -383,6 +383,9 @@ static int block2mtd_setup2(const char *val) size_t erase_size = PAGE_SIZE; int i, ret; + if (!val) + parse_err("no argument"); + if (strnlen(val, sizeof(buf)) >= sizeof(buf)) parse_err("parameter too long"); diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c index 1696bbe..c3447f1 100644 --- a/drivers/mtd/devices/phram.c +++ b/drivers/mtd/devices/phram.c @@ -241,6 +241,9 @@ static int phram_setup(const char *val, struct kernel_param *kp) uint32_t len; int i, ret; + if (!val) + parse_err("not arguments\n"); + if (strnlen(val, sizeof(buf)) >= sizeof(buf)) parse_err("parameter too long\n"); diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index be53d98..04770db 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -728,6 +728,9 @@ static int pcie_aspm_set_policy(const char *val, struct kernel_param *kp) int i; struct pcie_link_state *link; + if (!val) + return -EINVAL; + for (i = 0; i < ARRAY_SIZE(policy_str); i++) if (!strncmp(val, policy_str[i], strlen(policy_str[i]))) break; diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c index eadc1ab..8832b7a 100644 --- a/drivers/serial/kgdboc.c +++ b/drivers/serial/kgdboc.c @@ -108,7 +108,12 @@ static void kgdboc_put_char(u8 chr) static int param_set_kgdboc_var(const char *kmessage, struct kernel_param *kp) { - int len = strlen(kmessage); + int len; + + if (!kmessage || !(len = strlen(kmessage))) { + printk(KERN_ERR "kgdboc: config string too short\n"); + return -ENOSPC; + } if (len >= MAX_CONFIG_LEN) { printk(KERN_ERR "kgdboc: config string too long\n"); diff --git a/drivers/usb/storage/libusual.c b/drivers/usb/storage/libusual.c index fe3ffe1..5eeb768 100644 --- a/drivers/usb/storage/libusual.c +++ b/drivers/usb/storage/libusual.c @@ -209,6 +209,9 @@ static int usu_set_bias(const char *bias_s, struct kernel_param *kp) int len; int bias_n = 0; + if (!bias_s) + return -EINVAL; + len = strlen(bias_s); if (len == 0) return -EDOM; diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index e50cfa3..cbf2d5a 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -451,7 +451,10 @@ static ctl_table nlm_sysctl_root[] = { static int param_set_##name(const char *val, struct kernel_param *kp) \ { \ char *endp; \ - __typeof__(type) num = which_strtol(val, &endp, 0); \ + __typeof__(type) num; \ + if (!val) \ + return -EINVAL; \ + num = which_strtol(val, &endp, 0); \ if (endp == val || *endp || num < (min) || num > (max)) \ return -EINVAL; \ *((int *) kp->arg) = num; \ diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index 21a84d4..7e8c0c6 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -60,8 +60,13 @@ unsigned int nfs_idmap_cache_timeout = 600 * HZ; static int param_set_idmap_timeout(const char *val, struct kernel_param *kp) { char *endp; - int num = simple_strtol(val, &endp, 0); - int jif = num * HZ; + int num, jif; + + if (!val) + return -EINVAL; + + num = simple_strtol(val, &endp, 0); + jif = num * HZ; if (endp == val || *endp || num < 0 || jif < num) return -EINVAL; *((int *)kp->arg) = jif; diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 4d79e3c..375f5d4 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1196,6 +1196,9 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) struct hlist_nulls_head *hash, *old_hash; struct nf_conntrack_tuple_hash *h; + if (!val) + return -EINVAL; + if (current->nsproxy->net_ns != &init_net) return -EOPNOTSUPP; diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 538ca43..b33a6dd 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -70,6 +70,9 @@ param_set_pool_mode(const char *val, struct kernel_param *kp) struct svc_pool_map *m = &svc_pool_map; int err; + if (!val) + return -EINVAL; + mutex_lock(&svc_pool_map_mutex); err = -EBUSY; -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/