/* * The USB Monitor, inspired by Dave Harding's USBMon. * * This is the 's' or 'stat' reader which debugs usbmon itself. * Note that this code blows through locks, so make sure that * /dbg/usbmon/0s is well protected from non-root users. * */ #include #include #include #include #include #include #include "usb_mon.h" #define STAT_BUF_SIZE 80 struct snap { int slen; char str[STAT_BUF_SIZE]; }; static int mon_stat_open(struct inode *inode, struct file *file) { struct mon_bus *mbus; struct snap *sp; sp = kmalloc(sizeof(struct snap), GFP_KERNEL); if (sp == NULL) return -ENOMEM; mbus = inode->i_private; sp->slen = snprintf(sp->str, STAT_BUF_SIZE, "nreaders %d events %u text_lost %u\n", mbus->nreaders, mbus->cnt_events, mbus->cnt_text_lost); file->private_data = sp; return 0; } static ssize_t mon_stat_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) { struct snap *sp = file->private_data; return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen); } static int mon_stat_release(struct inode *inode, struct file *file) { struct snap *sp = file->private_data; file->private_data = NULL; kfree(sp); return 0; } const struct file_operations mon_fops_stat = { .owner = THIS_MODULE, .open = mon_stat_open, .llseek = no_llseek, .read = mon_stat_read, /* .write = mon_stat_write, */ /* .poll = mon_stat_poll, */ /* .unlocked_ioctl = mon_stat_ioctl, */ .release = mon_stat_release, }; d> summaryrefslogtreecommitdiff
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authorDave Martin <Dave.Martin@arm.com>2017-01-06 17:54:51 +0000
committerChris Metcalf <cmetcalf@mellanox.com>2017-01-06 15:14:08 -0500
commitfd7c99142d77dc4a851879a66715abf12a3193fb (patch)
tree5fe0d6f6b165d867bb76c296c0afbb5b22c52f47 /net/ipv4/tcp_nv.c
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tile/ptrace: Preserve previous registers for short regset write
Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved. Cc: stable@vger.kernel.org Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Diffstat (limited to 'net/ipv4/tcp_nv.c')