mirror of https://gitee.com/openkylin/linux.git
[PATCH] cdrom_sysctl_info fix
Fix the cdrom_sysctl_info possible buffer overwrite bug. Also fix the locking of accessing topCdromPtr pointer. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Dave Young
Jens Axboe
parent
32eef96411
commit
554988d6fe
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@ -302,7 +302,7 @@ module_param(lockdoor, bool, 0);
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module_param(check_media_type, bool, 0);
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module_param(mrw_format_restart, bool, 0);
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static DEFINE_SPINLOCK(cdrom_lock);
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static DEFINE_MUTEX(cdrom_mutex);
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static const char *mrw_format_status[] = {
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"not mrw",
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@ -438,10 +438,10 @@ int register_cdrom(struct cdrom_device_info *cdi)
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cdo->generic_packet = cdrom_dummy_generic_packet;
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cdinfo(CD_REG_UNREG, "drive \"/dev/%s\" registered\n", cdi->name);
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spin_lock(&cdrom_lock);
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mutex_lock(&cdrom_mutex);
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cdi->next = topCdromPtr;
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topCdromPtr = cdi;
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spin_unlock(&cdrom_lock);
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mutex_unlock(&cdrom_mutex);
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return 0;
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}
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#undef ENSURE
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@ -452,7 +452,7 @@ int unregister_cdrom(struct cdrom_device_info *unreg)
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cdinfo(CD_OPEN, "entering unregister_cdrom\n");
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prev = NULL;
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spin_lock(&cdrom_lock);
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mutex_lock(&cdrom_mutex);
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cdi = topCdromPtr;
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while (cdi && cdi != unreg) {
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prev = cdi;
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@ -460,7 +460,7 @@ int unregister_cdrom(struct cdrom_device_info *unreg)
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}
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if (cdi == NULL) {
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spin_unlock(&cdrom_lock);
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mutex_unlock(&cdrom_mutex);
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return -2;
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}
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if (prev)
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@ -468,7 +468,7 @@ int unregister_cdrom(struct cdrom_device_info *unreg)
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else
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topCdromPtr = cdi->next;
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spin_unlock(&cdrom_lock);
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mutex_unlock(&cdrom_mutex);
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if (cdi->exit)
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cdi->exit(cdi);
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@ -3289,103 +3289,137 @@ static struct cdrom_sysctl_settings {
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int check; /* check media type */
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} cdrom_sysctl_settings;
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enum cdrom_print_option {
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CTL_NAME,
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CTL_SPEED,
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CTL_SLOTS,
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CTL_CAPABILITY
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};
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static int cdrom_print_info(const char *header, int val, char *info,
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int *pos, enum cdrom_print_option option)
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{
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const int max_size = sizeof(cdrom_sysctl_settings.info);
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struct cdrom_device_info *cdi;
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int ret;
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ret = scnprintf(info + *pos, max_size - *pos, header);
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if (!ret)
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return 1;
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*pos += ret;
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for (cdi = topCdromPtr; cdi; cdi = cdi->next) {
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switch (option) {
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case CTL_NAME:
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ret = scnprintf(info + *pos, max_size - *pos,
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"\t%s", cdi->name);
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break;
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case CTL_SPEED:
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ret = scnprintf(info + *pos, max_size - *pos,
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"\t%d", cdi->speed);
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break;
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case CTL_SLOTS:
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ret = scnprintf(info + *pos, max_size - *pos,
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"\t%d", cdi->capacity);
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break;
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case CTL_CAPABILITY:
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ret = scnprintf(info + *pos, max_size - *pos,
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"\t%d", CDROM_CAN(val) != 0);
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break;
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default:
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printk(KERN_INFO "cdrom: invalid option%d\n", option);
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return 1;
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}
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if (!ret)
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return 1;
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*pos += ret;
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}
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return 0;
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}
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static int cdrom_sysctl_info(ctl_table *ctl, int write, struct file * filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int pos;
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struct cdrom_device_info *cdi;
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int pos;
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char *info = cdrom_sysctl_settings.info;
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const int max_size = sizeof(cdrom_sysctl_settings.info);
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if (!*lenp || (*ppos && !write)) {
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*lenp = 0;
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return 0;
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}
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mutex_lock(&cdrom_mutex);
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pos = sprintf(info, "CD-ROM information, " VERSION "\n");
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pos += sprintf(info+pos, "\ndrive name:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%s", cdi->name);
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pos += sprintf(info+pos, "\ndrive speed:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", cdi->speed);
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pos += sprintf(info+pos, "\ndrive # of slots:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", cdi->capacity);
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pos += sprintf(info+pos, "\nCan close tray:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CLOSE_TRAY) != 0);
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pos += sprintf(info+pos, "\nCan open tray:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_OPEN_TRAY) != 0);
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pos += sprintf(info+pos, "\nCan lock tray:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_LOCK) != 0);
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pos += sprintf(info+pos, "\nCan change speed:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_SELECT_SPEED) != 0);
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pos += sprintf(info+pos, "\nCan select disk:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_SELECT_DISC) != 0);
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pos += sprintf(info+pos, "\nCan read multisession:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MULTI_SESSION) != 0);
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pos += sprintf(info+pos, "\nCan read MCN:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MCN) != 0);
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pos += sprintf(info+pos, "\nReports media changed:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MEDIA_CHANGED) != 0);
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pos += sprintf(info+pos, "\nCan play audio:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_PLAY_AUDIO) != 0);
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pos += sprintf(info+pos, "\nCan write CD-R:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CD_R) != 0);
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pos += sprintf(info+pos, "\nCan write CD-RW:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_CD_RW) != 0);
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pos += sprintf(info+pos, "\nCan read DVD:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD) != 0);
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pos += sprintf(info+pos, "\nCan write DVD-R:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD_R) != 0);
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pos += sprintf(info+pos, "\nCan write DVD-RAM:");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_DVD_RAM) != 0);
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pos += sprintf(info+pos, "\nCan read MRW:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MRW) != 0);
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pos += sprintf(info+pos, "\nCan write MRW:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_MRW_W) != 0);
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pos += sprintf(info+pos, "\nCan write RAM:\t");
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for (cdi=topCdromPtr;cdi!=NULL;cdi=cdi->next)
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pos += sprintf(info+pos, "\t%d", CDROM_CAN(CDC_RAM) != 0);
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strcpy(info+pos,"\n\n");
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return proc_dostring(ctl, write, filp, buffer, lenp, ppos);
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if (cdrom_print_info("\ndrive name:\t", 0, info, &pos, CTL_NAME))
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goto done;
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if (cdrom_print_info("\ndrive speed:\t", 0, info, &pos, CTL_SPEED))
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goto done;
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if (cdrom_print_info("\ndrive # of slots:", 0, info, &pos, CTL_SLOTS))
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goto done;
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if (cdrom_print_info("\nCan close tray:\t",
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CDC_CLOSE_TRAY, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan open tray:\t",
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CDC_OPEN_TRAY, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan lock tray:\t",
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CDC_LOCK, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan change speed:",
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CDC_SELECT_SPEED, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan select disk:",
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CDC_SELECT_DISC, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan read multisession:",
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CDC_MULTI_SESSION, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan read MCN:\t",
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CDC_MCN, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nReports media changed:",
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CDC_MEDIA_CHANGED, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan play audio:\t",
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CDC_PLAY_AUDIO, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write CD-R:\t",
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CDC_CD_R, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write CD-RW:",
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CDC_CD_RW, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan read DVD:\t",
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CDC_DVD, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write DVD-R:",
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CDC_DVD_R, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write DVD-RAM:",
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CDC_DVD_RAM, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan read MRW:\t",
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CDC_MRW, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write MRW:\t",
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CDC_MRW_W, info, &pos, CTL_CAPABILITY))
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goto done;
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if (cdrom_print_info("\nCan write RAM:\t",
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CDC_RAM, info, &pos, CTL_CAPABILITY))
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goto done;
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if (!scnprintf(info + pos, max_size - pos, "\n\n"))
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goto done;
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doit:
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mutex_unlock(&cdrom_mutex);
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return proc_dostring(ctl, write, filp, buffer, lenp, ppos);
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done:
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printk(KERN_INFO "cdrom: info buffer too small\n");
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goto doit;
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}
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/* Unfortunately, per device settings are not implemented through
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