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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-08 21:48:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-08 21:48:15 -0700
commit5ad18b2e60b75c7297a998dea702451d33a052ed (patch)
treec47fb503b4cfc8d3e99ad425aadede9832e96dc4 /drivers/usb
parent92c1d6522135050cb377a18cc6e30d08dfb87efb (diff)
parent318759b4737c3b3789e2fd64d539f437d52386f5 (diff)
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull force_sig() argument change from Eric Biederman: "A source of error over the years has been that force_sig has taken a task parameter when it is only safe to use force_sig with the current task. The force_sig function is built for delivering synchronous signals such as SIGSEGV where the userspace application caused a synchronous fault (such as a page fault) and the kernel responded with a signal. Because the name force_sig does not make this clear, and because the force_sig takes a task parameter the function force_sig has been abused for sending other kinds of signals over the years. Slowly those have been fixed when the oopses have been tracked down. This set of changes fixes the remaining abusers of force_sig and carefully rips out the task parameter from force_sig and friends making this kind of error almost impossible in the future" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits) signal/x86: Move tsk inside of CONFIG_MEMORY_FAILURE in do_sigbus signal: Remove the signal number and task parameters from force_sig_info signal: Factor force_sig_info_to_task out of force_sig_info signal: Generate the siginfo in force_sig signal: Move the computation of force into send_signal and correct it. signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal signal: Remove the task parameter from force_sig_fault signal: Use force_sig_fault_to_task for the two calls that don't deliver to current signal: Explicitly call force_sig_fault on current signal/unicore32: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from ptrace_break signal/nds32: Remove tsk parameter from send_sigtrap signal/riscv: Remove tsk parameter from do_trap signal/sh: Remove tsk parameter from force_sig_info_fault signal/um: Remove task parameter from send_sigtrap signal/x86: Remove task parameter from send_sigtrap signal: Remove task parameter from force_sig_mceerr signal: Remove task parameter from force_sig signal: Remove task parameter from force_sigsegv ...
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/devio.c48
1 files changed, 24 insertions, 24 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index fa783531ee88..a02448105527 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -63,7 +63,7 @@ struct usb_dev_state {
unsigned int discsignr;
struct pid *disc_pid;
const struct cred *cred;
- void __user *disccontext;
+ sigval_t disccontext;
unsigned long ifclaimed;
u32 disabled_bulk_eps;
bool privileges_dropped;
@@ -90,6 +90,7 @@ struct async {
unsigned int ifnum;
void __user *userbuffer;
void __user *userurb;
+ sigval_t userurb_sigval;
struct urb *urb;
struct usb_memory *usbm;
unsigned int mem_usage;
@@ -582,22 +583,19 @@ static void async_completed(struct urb *urb)
{
struct async *as = urb->context;
struct usb_dev_state *ps = as->ps;
- struct kernel_siginfo sinfo;
struct pid *pid = NULL;
const struct cred *cred = NULL;
unsigned long flags;
- int signr;
+ sigval_t addr;
+ int signr, errno;
spin_lock_irqsave(&ps->lock, flags);
list_move_tail(&as->asynclist, &ps->async_completed);
as->status = urb->status;
signr = as->signr;
if (signr) {
- clear_siginfo(&sinfo);
- sinfo.si_signo = as->signr;
- sinfo.si_errno = as->status;
- sinfo.si_code = SI_ASYNCIO;
- sinfo.si_addr = as->userurb;
+ errno = as->status;
+ addr = as->userurb_sigval;
pid = get_pid(as->pid);
cred = get_cred(as->cred);
}
@@ -615,7 +613,7 @@ static void async_completed(struct urb *urb)
spin_unlock_irqrestore(&ps->lock, flags);
if (signr) {
- kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
+ kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
put_pid(pid);
put_cred(cred);
}
@@ -1427,7 +1425,7 @@ find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
- void __user *arg)
+ void __user *arg, sigval_t userurb_sigval)
{
struct usbdevfs_iso_packet_desc *isopkt = NULL;
struct usb_host_endpoint *ep;
@@ -1727,6 +1725,7 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
isopkt = NULL;
as->ps = ps;
as->userurb = arg;
+ as->userurb_sigval = userurb_sigval;
if (as->usbm) {
unsigned long uurb_start = (unsigned long)uurb->buffer;
@@ -1801,13 +1800,17 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
+ sigval_t userurb_sigval;
if (copy_from_user(&uurb, arg, sizeof(uurb)))
return -EFAULT;
+ memset(&userurb_sigval, 0, sizeof(userurb_sigval));
+ userurb_sigval.sival_ptr = arg;
+
return proc_do_submiturb(ps, &uurb,
(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
- arg);
+ arg, userurb_sigval);
}
static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
@@ -1977,7 +1980,7 @@ static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *a
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
ps->discsignr = ds.signr;
- ps->disccontext = compat_ptr(ds.context);
+ ps->disccontext.sival_int = ds.context;
return 0;
}
@@ -2005,13 +2008,17 @@ static int get_urb32(struct usbdevfs_urb *kurb,
static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
+ sigval_t userurb_sigval;
if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
return -EFAULT;
+ memset(&userurb_sigval, 0, sizeof(userurb_sigval));
+ userurb_sigval.sival_int = ptr_to_compat(arg);
+
return proc_do_submiturb(ps, &uurb,
((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
- arg);
+ arg, userurb_sigval);
}
static int processcompl_compat(struct async *as, void __user * __user *arg)
@@ -2092,7 +2099,7 @@ static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
ps->discsignr = ds.signr;
- ps->disccontext = ds.context;
+ ps->disccontext.sival_ptr = ds.context;
return 0;
}
@@ -2614,22 +2621,15 @@ const struct file_operations usbdev_file_operations = {
static void usbdev_remove(struct usb_device *udev)
{
struct usb_dev_state *ps;
- struct kernel_siginfo sinfo;
while (!list_empty(&udev->filelist)) {
ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
destroy_all_async(ps);
wake_up_all(&ps->wait);
list_del_init(&ps->list);
- if (ps->discsignr) {
- clear_siginfo(&sinfo);
- sinfo.si_signo = ps->discsignr;
- sinfo.si_errno = EPIPE;
- sinfo.si_code = SI_ASYNCIO;
- sinfo.si_addr = ps->disccontext;
- kill_pid_info_as_cred(ps->discsignr, &sinfo,
- ps->disc_pid, ps->cred);
- }
+ if (ps->discsignr)
+ kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
+ ps->disc_pid, ps->cred);
}
}