From: Marcel Holtmann marcel@holtmann.org
mainline inclusion from mainline-v5.6-rc1 commit 18f81241b74fb49d576c83fbbab9a0b6e3bb20d4 category: bugfix bugzilla: 1https://gitee.com/src-openeuler/kernel/issues/I917MX CVE: CVE-2024-24860
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The debugfs entries for {min,max}_key_size are created during SMP registration and thus it might lead to multiple attempts to create the same entries. Avoid this by moving them to the LE controller init section.
Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Johan Hedberg johan.hedberg@intel.com Signed-off-by: Liu Jian liujian56@huawei.com
Conflicts: net/bluetooth/hci_debugfs.c --- net/bluetooth/hci_debugfs.c | 61 ++++++++++++++++++++++++ net/bluetooth/smp.c | 93 ------------------------------------- 2 files changed, 61 insertions(+), 93 deletions(-)
diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c index 51f5b1efc3a5..16d60376e4e4 100644 --- a/net/bluetooth/hci_debugfs.c +++ b/net/bluetooth/hci_debugfs.c @@ -26,6 +26,7 @@ #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h>
+#include "smp.h" #include "hci_debugfs.h"
#define DEFINE_QUIRK_ATTRIBUTE(__name, __quirk) \ @@ -941,6 +942,62 @@ static int adv_max_interval_get(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(adv_max_interval_fops, adv_max_interval_get, adv_max_interval_set, "%llu\n");
+static int min_key_size_set(void *data, u64 val) +{ + struct hci_dev *hdev = data; + + if (val > hdev->le_max_key_size || val < SMP_MIN_ENC_KEY_SIZE) + return -EINVAL; + + hci_dev_lock(hdev); + hdev->le_min_key_size = val; + hci_dev_unlock(hdev); + + return 0; +} + +static int min_key_size_get(void *data, u64 *val) +{ + struct hci_dev *hdev = data; + + hci_dev_lock(hdev); + *val = hdev->le_min_key_size; + hci_dev_unlock(hdev); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(min_key_size_fops, min_key_size_get, + min_key_size_set, "%llu\n"); + +static int max_key_size_set(void *data, u64 val) +{ + struct hci_dev *hdev = data; + + if (val > SMP_MAX_ENC_KEY_SIZE || val < hdev->le_min_key_size) + return -EINVAL; + + hci_dev_lock(hdev); + hdev->le_max_key_size = val; + hci_dev_unlock(hdev); + + return 0; +} + +static int max_key_size_get(void *data, u64 *val) +{ + struct hci_dev *hdev = data; + + hci_dev_lock(hdev); + *val = hdev->le_max_key_size; + hci_dev_unlock(hdev); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(max_key_size_fops, max_key_size_get, + max_key_size_set, "%llu\n"); + DEFINE_QUIRK_ATTRIBUTE(quirk_strict_duplicate_filter, HCI_QUIRK_STRICT_DUPLICATE_FILTER); DEFINE_QUIRK_ATTRIBUTE(quirk_simultaneous_discovery, @@ -994,6 +1051,10 @@ void hci_debugfs_create_le(struct hci_dev *hdev) &adv_max_interval_fops); debugfs_create_u16("discov_interleaved_timeout", 0644, hdev->debugfs, &hdev->discov_interleaved_timeout); + debugfs_create_file("min_key_size", 0644, hdev->debugfs, hdev, + &min_key_size_fops); + debugfs_create_file("max_key_size", 0644, hdev->debugfs, hdev, + &max_key_size_fops);
debugfs_create_file("quirk_strict_duplicate_filter", 0644, hdev->debugfs, hdev, diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 719ae1dff7b4..3935837daab4 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -3401,94 +3401,6 @@ static const struct file_operations force_bredr_smp_fops = { .llseek = default_llseek, };
-static ssize_t le_min_key_size_read(struct file *file, - char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hci_dev *hdev = file->private_data; - char buf[4]; - - snprintf(buf, sizeof(buf), "%2u\n", hdev->le_min_key_size); - - return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); -} - -static ssize_t le_min_key_size_write(struct file *file, - const char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hci_dev *hdev = file->private_data; - char buf[32]; - size_t buf_size = min(count, (sizeof(buf) - 1)); - u8 key_size; - - if (copy_from_user(buf, user_buf, buf_size)) - return -EFAULT; - - buf[buf_size] = '\0'; - - sscanf(buf, "%hhu", &key_size); - - if (key_size > hdev->le_max_key_size || - key_size < SMP_MIN_ENC_KEY_SIZE) - return -EINVAL; - - hdev->le_min_key_size = key_size; - - return count; -} - -static const struct file_operations le_min_key_size_fops = { - .open = simple_open, - .read = le_min_key_size_read, - .write = le_min_key_size_write, - .llseek = default_llseek, -}; - -static ssize_t le_max_key_size_read(struct file *file, - char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hci_dev *hdev = file->private_data; - char buf[4]; - - snprintf(buf, sizeof(buf), "%2u\n", hdev->le_max_key_size); - - return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); -} - -static ssize_t le_max_key_size_write(struct file *file, - const char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hci_dev *hdev = file->private_data; - char buf[32]; - size_t buf_size = min(count, (sizeof(buf) - 1)); - u8 key_size; - - if (copy_from_user(buf, user_buf, buf_size)) - return -EFAULT; - - buf[buf_size] = '\0'; - - sscanf(buf, "%hhu", &key_size); - - if (key_size > SMP_MAX_ENC_KEY_SIZE || - key_size < hdev->le_min_key_size) - return -EINVAL; - - hdev->le_max_key_size = key_size; - - return count; -} - -static const struct file_operations le_max_key_size_fops = { - .open = simple_open, - .read = le_max_key_size_read, - .write = le_max_key_size_write, - .llseek = default_llseek, -}; - int smp_register(struct hci_dev *hdev) { struct l2cap_chan *chan; @@ -3513,11 +3425,6 @@ int smp_register(struct hci_dev *hdev)
hdev->smp_data = chan;
- debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, - &le_min_key_size_fops); - debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, - &le_max_key_size_fops); - /* If the controller does not support BR/EDR Secure Connections * feature, then the BR/EDR SMP channel shall not be present. *