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authorDavid S. Miller <davem@davemloft.net>2019-04-05 14:14:19 -0700
committerDavid S. Miller <davem@davemloft.net>2019-04-05 14:14:19 -0700
commitf83f7151950dd9e0f6b4a1a405bf5e55c5294e4d (patch)
treef8d9d8ee821fcc9f0a8e1a8679bc622219c70e3b /kernel
parent8f4043f1253292495dbf9c8be0c1b07b4b9902b7 (diff)
parent7f46774c6480174eb869a3c15167eafac467a6af (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Minor comment merge conflict in mlx5. Staging driver has a fixup due to the skb->xmit_more changes in 'net-next', but was removed in 'net'. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/cpumap.c13
-rw-r--r--kernel/bpf/inode.c32
-rw-r--r--kernel/bpf/verifier.c5
-rw-r--r--kernel/cpu.c20
-rw-r--r--kernel/ptrace.c15
-rw-r--r--kernel/signal.c13
-rw-r--r--kernel/watchdog.c6
7 files changed, 70 insertions, 34 deletions
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index 8974b3755670..3c18260403dd 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -162,10 +162,14 @@ static void cpu_map_kthread_stop(struct work_struct *work)
static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
struct xdp_frame *xdpf)
{
+ unsigned int hard_start_headroom;
unsigned int frame_size;
void *pkt_data_start;
struct sk_buff *skb;
+ /* Part of headroom was reserved to xdpf */
+ hard_start_headroom = sizeof(struct xdp_frame) + xdpf->headroom;
+
/* build_skb need to place skb_shared_info after SKB end, and
* also want to know the memory "truesize". Thus, need to
* know the memory frame size backing xdp_buff.
@@ -183,15 +187,15 @@ static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
* is not at a fixed memory location, with mixed length
* packets, which is bad for cache-line hotness.
*/
- frame_size = SKB_DATA_ALIGN(xdpf->len + xdpf->headroom) +
+ frame_size = SKB_DATA_ALIGN(xdpf->len + hard_start_headroom) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- pkt_data_start = xdpf->data - xdpf->headroom;
+ pkt_data_start = xdpf->data - hard_start_headroom;
skb = build_skb(pkt_data_start, frame_size);
if (!skb)
return NULL;
- skb_reserve(skb, xdpf->headroom);
+ skb_reserve(skb, hard_start_headroom);
__skb_put(skb, xdpf->len);
if (xdpf->metasize)
skb_metadata_set(skb, xdpf->metasize);
@@ -205,6 +209,9 @@ static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
* - RX ring dev queue index (skb_record_rx_queue)
*/
+ /* Allow SKB to reuse area used by xdp_frame */
+ xdp_scrub_frame(xdpf);
+
return skb;
}
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 2ada5e21dfa6..4a8f390a2b82 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -554,19 +554,6 @@ struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type typ
}
EXPORT_SYMBOL(bpf_prog_get_type_path);
-static void bpf_evict_inode(struct inode *inode)
-{
- enum bpf_type type;
-
- truncate_inode_pages_final(&inode->i_data);
- clear_inode(inode);
-
- if (S_ISLNK(inode->i_mode))
- kfree(inode->i_link);
- if (!bpf_inode_type(inode, &type))
- bpf_any_put(inode->i_private, type);
-}
-
/*
* Display the mount options in /proc/mounts.
*/
@@ -579,11 +566,28 @@ static int bpf_show_options(struct seq_file *m, struct dentry *root)
return 0;
}
+static void bpf_destroy_inode_deferred(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ enum bpf_type type;
+
+ if (S_ISLNK(inode->i_mode))
+ kfree(inode->i_link);
+ if (!bpf_inode_type(inode, &type))
+ bpf_any_put(inode->i_private, type);
+ free_inode_nonrcu(inode);
+}
+
+static void bpf_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, bpf_destroy_inode_deferred);
+}
+
static const struct super_operations bpf_super_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.show_options = bpf_show_options,
- .evict_inode = bpf_evict_inode,
+ .destroy_inode = bpf_destroy_inode,
};
enum {
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 2fe89138309a..b7ad8003c4e6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1898,8 +1898,9 @@ continue_func:
}
frame++;
if (frame >= MAX_CALL_FRAMES) {
- WARN_ONCE(1, "verifier bug. Call stack is too deep\n");
- return -EFAULT;
+ verbose(env, "the call stack of %d frames is too deep !\n",
+ frame);
+ return -E2BIG;
}
goto process_func;
}
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 025f419d16f6..6754f3ecfd94 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -564,6 +564,20 @@ static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st)
cpuhp_invoke_callback(cpu, st->state, false, NULL, NULL);
}
+static inline bool can_rollback_cpu(struct cpuhp_cpu_state *st)
+{
+ if (IS_ENABLED(CONFIG_HOTPLUG_CPU))
+ return true;
+ /*
+ * When CPU hotplug is disabled, then taking the CPU down is not
+ * possible because takedown_cpu() and the architecture and
+ * subsystem specific mechanisms are not available. So the CPU
+ * which would be completely unplugged again needs to stay around
+ * in the current state.
+ */
+ return st->state <= CPUHP_BRINGUP_CPU;
+}
+
static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
enum cpuhp_state target)
{
@@ -574,8 +588,10 @@ static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
st->state++;
ret = cpuhp_invoke_callback(cpu, st->state, true, NULL, NULL);
if (ret) {
- st->target = prev_state;
- undo_cpu_up(cpu, st);
+ if (can_rollback_cpu(st)) {
+ st->target = prev_state;
+ undo_cpu_up(cpu, st);
+ }
break;
}
}
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 771e93f9c43f..6f357f4fc859 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -29,6 +29,7 @@
#include <linux/hw_breakpoint.h>
#include <linux/cn_proc.h>
#include <linux/compat.h>
+#include <linux/sched/signal.h>
/*
* Access another process' address space via ptrace.
@@ -924,18 +925,26 @@ int ptrace_request(struct task_struct *child, long request,
ret = ptrace_setsiginfo(child, &siginfo);
break;
- case PTRACE_GETSIGMASK:
+ case PTRACE_GETSIGMASK: {
+ sigset_t *mask;
+
if (addr != sizeof(sigset_t)) {
ret = -EINVAL;
break;
}
- if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))
+ if (test_tsk_restore_sigmask(child))
+ mask = &child->saved_sigmask;
+ else
+ mask = &child->blocked;
+
+ if (copy_to_user(datavp, mask, sizeof(sigset_t)))
ret = -EFAULT;
else
ret = 0;
break;
+ }
case PTRACE_SETSIGMASK: {
sigset_t new_set;
@@ -961,6 +970,8 @@ int ptrace_request(struct task_struct *child, long request,
child->blocked = new_set;
spin_unlock_irq(&child->sighand->siglock);
+ clear_tsk_restore_sigmask(child);
+
ret = 0;
break;
}
diff --git a/kernel/signal.c b/kernel/signal.c
index b7953934aa99..f98448cf2def 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3605,16 +3605,11 @@ SYSCALL_DEFINE4(pidfd_send_signal, int, pidfd, int, sig,
if (unlikely(sig != kinfo.si_signo))
goto err;
+ /* Only allow sending arbitrary signals to yourself. */
+ ret = -EPERM;
if ((task_pid(current) != pid) &&
- (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL)) {
- /* Only allow sending arbitrary signals to yourself. */
- ret = -EPERM;
- if (kinfo.si_code != SI_USER)
- goto err;
-
- /* Turn this into a regular kill signal. */
- prepare_kill_siginfo(sig, &kinfo);
- }
+ (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
+ goto err;
} else {
prepare_kill_siginfo(sig, &kinfo);
}
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 403c9bd90413..6a5787233113 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -554,13 +554,15 @@ static void softlockup_start_all(void)
int lockup_detector_online_cpu(unsigned int cpu)
{
- watchdog_enable(cpu);
+ if (cpumask_test_cpu(cpu, &watchdog_allowed_mask))
+ watchdog_enable(cpu);
return 0;
}
int lockup_detector_offline_cpu(unsigned int cpu)
{
- watchdog_disable(cpu);
+ if (cpumask_test_cpu(cpu, &watchdog_allowed_mask))
+ watchdog_disable(cpu);
return 0;
}