20 files changed, 64 insertions, 147 deletions

diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index 04ab3b653a48..b6810db24ca4 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -15,7 +15,6 @@ generic-y += mcs_spinlock.h
 generic-y += mmiowb.h
 generic-y += module.h
 generic-y += module.lds.h
-generic-y += param.h
 generic-y += parport.h
 generic-y += percpu.h
 generic-y += preempt.h
diff --git a/arch/um/include/asm/asm-prototypes.h b/arch/um/include/asm/asm-prototypes.h
index 5898a26daa0d..408b31d59127 100644
--- a/arch/um/include/asm/asm-prototypes.h
+++ b/arch/um/include/asm/asm-prototypes.h
@@ -1 +1,6 @@
 #include <asm-generic/asm-prototypes.h>
+#include <asm/checksum.h>
+
+#ifdef CONFIG_UML_X86
+extern void cmpxchg8b_emu(void);
+#endif
diff --git a/arch/um/include/asm/cpufeature.h b/arch/um/include/asm/cpufeature.h
index 1eb8b834fbec..4354f6984271 100644
--- a/arch/um/include/asm/cpufeature.h
+++ b/arch/um/include/asm/cpufeature.h
@@ -4,7 +4,7 @@
 
 #include <asm/processor.h>
 
-#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
+#if defined(__KERNEL__) && !defined(__ASSEMBLER__)
 
 #include <asm/asm.h>
 #include <linux/bitops.h>
@@ -137,5 +137,5 @@ t_no:
 #define CPU_FEATURE_TYPEVAL		boot_cpu_data.x86_vendor, boot_cpu_data.x86, \
 					boot_cpu_data.x86_model
 
-#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
+#endif /* defined(__KERNEL__) && !defined(__ASSEMBLER__) */
 #endif /* _ASM_UM_CPUFEATURE_H */
diff --git a/arch/um/include/asm/current.h b/arch/um/include/asm/current.h
index de64e032d66c..8accc6d6f502 100644
--- a/arch/um/include/asm/current.h
+++ b/arch/um/include/asm/current.h
@@ -5,7 +5,7 @@
 #include <linux/compiler.h>
 #include <linux/threads.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct task_struct;
 extern struct task_struct *cpu_tasks[NR_CPUS];
@@ -18,6 +18,6 @@ static __always_inline struct task_struct *get_current(void)
 
 #define current get_current()
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __ASM_CURRENT_H */
diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
index 749dfe8512e8..36dbedd1af48 100644
--- a/arch/um/include/asm/irq.h
+++ b/arch/um/include/asm/irq.h
@@ -13,17 +13,18 @@
 #define TELNETD_IRQ 		8
 #define XTERM_IRQ 		9
 #define RANDOM_IRQ 		10
+#define SIGCHLD_IRQ		11
 
 #ifdef CONFIG_UML_NET_VECTOR
 
-#define VECTOR_BASE_IRQ		(RANDOM_IRQ + 1)
+#define VECTOR_BASE_IRQ		(SIGCHLD_IRQ + 1)
 #define VECTOR_IRQ_SPACE	8
 
 #define UM_FIRST_DYN_IRQ (VECTOR_IRQ_SPACE + VECTOR_BASE_IRQ)
 
 #else
 
-#define UM_FIRST_DYN_IRQ (RANDOM_IRQ + 1)
+#define UM_FIRST_DYN_IRQ (SIGCHLD_IRQ + 1)
 
 #endif
 
diff --git a/arch/um/include/asm/mmu.h b/arch/um/include/asm/mmu.h
index a3eaca41ff61..4d0e4239f3cc 100644
--- a/arch/um/include/asm/mmu.h
+++ b/arch/um/include/asm/mmu.h
@@ -6,11 +6,14 @@
 #ifndef __ARCH_UM_MMU_H
 #define __ARCH_UM_MMU_H
 
+#include "linux/types.h"
 #include <mm_id.h>
 
 typedef struct mm_context {
 	struct mm_id id;
 
+	struct list_head list;
+
 	/* Address range in need of a TLB sync */
 	unsigned long sync_tlb_range_from;
 	unsigned long sync_tlb_range_to;
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 23dcc914d44e..0bbb24868557 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -16,11 +16,6 @@
 #define activate_mm activate_mm
 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 {
-	/*
-	 * This is called by fs/exec.c and sys_unshare()
-	 * when the new ->mm is used for the first time.
-	 */
-	__switch_mm(&new->context.id);
 }
 
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
@@ -28,11 +23,9 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 {
 	unsigned cpu = smp_processor_id();
 
-	if(prev != next){
+	if (prev != next) {
 		cpumask_clear_cpu(cpu, mm_cpumask(prev));
 		cpumask_set_cpu(cpu, mm_cpumask(next));
-		if(next != &init_mm)
-			__switch_mm(&next->context.id);
 	}
 }
 
diff --git a/arch/um/include/asm/page.h b/arch/um/include/asm/page.h
index 3d516f3ca9c7..6f54254aaf44 100644
--- a/arch/um/include/asm/page.h
+++ b/arch/um/include/asm/page.h
@@ -11,7 +11,7 @@
 
 #include <vdso/page.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 struct page;
 
@@ -94,7 +94,7 @@ extern unsigned long uml_physmem;
 #include <asm-generic/memory_model.h>
 #include <asm-generic/getorder.h>
 
-#endif	/* __ASSEMBLY__ */
+#endif	/* __ASSEMBLER__ */
 
 #ifdef CONFIG_X86_32
 #define __HAVE_ARCH_GATE_AREA 1
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index ca2a519d53ab..24fdea6f88c3 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -314,7 +314,7 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
 	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
 #define __swp_entry_to_pte(x)		((pte_t) { (x).val })
 
-static inline int pte_swp_exclusive(pte_t pte)
+static inline bool pte_swp_exclusive(pte_t pte)
 {
 	return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE);
 }
diff --git a/arch/um/include/asm/ptrace-generic.h b/arch/um/include/asm/ptrace-generic.h
index 4696f24d1492..86d74f9d33cf 100644
--- a/arch/um/include/asm/ptrace-generic.h
+++ b/arch/um/include/asm/ptrace-generic.h
@@ -6,7 +6,7 @@
 #ifndef __UM_PTRACE_GENERIC_H
 #define __UM_PTRACE_GENERIC_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <sysdep/ptrace.h>
 
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
index f9ad06fcc991..7a6f4dc99fa1 100644
--- a/arch/um/include/asm/thread_info.h
+++ b/arch/um/include/asm/thread_info.h
@@ -9,7 +9,7 @@
 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <asm/types.h>
 #include <asm/page.h>
@@ -43,6 +43,8 @@ struct thread_info {
 #define TIF_NOTIFY_RESUME	8
 #define TIF_SECCOMP		9	/* secure computing */
 #define TIF_SINGLESTEP		10	/* single stepping userspace */
+#define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */
+
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -50,7 +52,11 @@ struct thread_info {
 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
+#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
 
+#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \
+				 _TIF_NOTIFY_RESUME)
+
 #endif
diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h
index 4f44dcce8a7c..2f9bfd99460a 100644
--- a/arch/um/include/shared/as-layout.h
+++ b/arch/um/include/shared/as-layout.h
@@ -26,7 +26,7 @@
 #define STUB_DATA_PAGES 2 /* must be a power of two */
 #define STUB_END (STUB_DATA + STUB_DATA_PAGES * UM_KERN_PAGE_SIZE)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <sysdep/ptrace.h>
 
diff --git a/arch/um/include/shared/common-offsets.h b/arch/um/include/shared/common-offsets.h
index 73f3a4792ed8..8ca66a1918c3 100644
--- a/arch/um/include/shared/common-offsets.h
+++ b/arch/um/include/shared/common-offsets.h
@@ -14,3 +14,7 @@ DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
 
 DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
 DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
+
+DEFINE(UM_KERN_GDT_ENTRY_TLS_ENTRIES, GDT_ENTRY_TLS_ENTRIES);
+
+DEFINE(UM_SECCOMP_ARCH_NATIVE, SECCOMP_ARCH_NATIVE);
diff --git a/arch/um/include/shared/irq_user.h b/arch/um/include/shared/irq_user.h
index 88835b52ae2b..746abc24a5d5 100644
--- a/arch/um/include/shared/irq_user.h
+++ b/arch/um/include/shared/irq_user.h
@@ -17,6 +17,8 @@ enum um_irq_type {
 struct siginfo;
 extern void sigio_handler(int sig, struct siginfo *unused_si,
 			  struct uml_pt_regs *regs, void *mc);
+extern void sigchld_handler(int sig, struct siginfo *unused_si,
+			   struct uml_pt_regs *regs, void *mc);
 void sigio_run_timetravel_handlers(void);
 extern void free_irq_by_fd(int fd);
 extern void deactivate_fd(int fd, int irqnum);
diff --git a/arch/um/include/shared/net_kern.h b/arch/um/include/shared/net_kern.h
deleted file mode 100644
index 67b2e9a1f2e5..000000000000
--- a/arch/um/include/shared/net_kern.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- */
-
-#ifndef __UM_NET_KERN_H
-#define __UM_NET_KERN_H
-
-#include <linux/netdevice.h>
-#include <linux/platform_device.h>
-#include <linux/skbuff.h>
-#include <linux/socket.h>
-#include <linux/list.h>
-#include <linux/workqueue.h>
-
-struct uml_net {
-	struct list_head list;
-	struct net_device *dev;
-	struct platform_device pdev;
-	int index;
-};
-
-struct uml_net_private {
-	struct list_head list;
-	spinlock_t lock;
-	struct net_device *dev;
-	struct timer_list tl;
-
-	struct work_struct work;
-	int fd;
-	unsigned char mac[ETH_ALEN];
-	int max_packet;
-	unsigned short (*protocol)(struct sk_buff *);
-	int (*open)(void *);
-	void (*close)(int, void *);
-	void (*remove)(void *);
-	int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
-	int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
-
-	void (*add_address)(unsigned char *, unsigned char *, void *);
-	void (*delete_address)(unsigned char *, unsigned char *, void *);
-	char user[];
-};
-
-struct net_kern_info {
-	void (*init)(struct net_device *, void *);
-	unsigned short (*protocol)(struct sk_buff *);
-	int (*read)(int, struct sk_buff *skb, struct uml_net_private *);
-	int (*write)(int, struct sk_buff *skb, struct uml_net_private *);
-};
-
-struct transport {
-	struct list_head list;
-	const char *name;
-	int (* const setup)(char *, char **, void *);
-	const struct net_user_info *user;
-	const struct net_kern_info *kern;
-	const int private_size;
-	const int setup_size;
-};
-
-extern int tap_setup_common(char *str, char *type, char **dev_name,
-			    char **mac_out, char **gate_addr);
-extern void register_transport(struct transport *new);
-extern unsigned short eth_protocol(struct sk_buff *skb);
-extern void uml_net_setup_etheraddr(struct net_device *dev, char *str);
-
-
-#endif
diff --git a/arch/um/include/shared/net_user.h b/arch/um/include/shared/net_user.h
deleted file mode 100644
index ba92a4d93531..000000000000
--- a/arch/um/include/shared/net_user.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- */
-
-#ifndef __UM_NET_USER_H__
-#define __UM_NET_USER_H__
-
-#define ETH_ADDR_LEN (6)
-#define ETH_HEADER_ETHERTAP (16)
-#define ETH_HEADER_OTHER (26) /* 14 for ethernet + VLAN + MPLS for crazy people */
-#define ETH_MAX_PACKET (1500)
-
-#define UML_NET_VERSION (4)
-
-struct net_user_info {
-	int (*init)(void *, void *);
-	int (*open)(void *);
-	void (*close)(int, void *);
-	void (*remove)(void *);
-	void (*add_address)(unsigned char *, unsigned char *, void *);
-	void (*delete_address)(unsigned char *, unsigned char *, void *);
-	int max_packet;
-	int mtu;
-};
-
-extern void iter_addresses(void *d, void (*cb)(unsigned char *,
-					       unsigned char *, void *),
-			   void *arg);
-
-extern void *get_output_buffer(int *len_out);
-extern void free_output_buffer(void *buffer);
-
-extern int tap_open_common(void *dev, char *gate_addr);
-extern void tap_check_ips(char *gate_addr, unsigned char *eth_addr);
-
-extern void read_output(int fd, char *output_out, int len);
-
-extern int net_read(int fd, void *buf, int len);
-extern int net_recvfrom(int fd, void *buf, int len);
-extern int net_write(int fd, void *buf, int len);
-extern int net_send(int fd, void *buf, int len);
-extern int net_sendto(int fd, void *buf, int len, void *to, int sock_len);
-
-extern void open_addr(unsigned char *addr, unsigned char *netmask, void *arg);
-extern void close_addr(unsigned char *addr, unsigned char *netmask, void *arg);
-
-extern char *split_if_spec(char *str, ...);
-
-extern int dev_netmask(void *d, void *m);
-
-#endif
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 152a60080d5b..b35cc8ce333b 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -143,7 +143,6 @@ extern int os_access(const char *file, int mode);
 extern int os_set_exec_close(int fd);
 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 extern int os_get_ifname(int fd, char *namebuf);
-extern int os_set_slip(int fd);
 extern int os_mode_fd(int fd, int mode);
 
 extern int os_seek_file(int fd, unsigned long long offset);
@@ -198,6 +197,7 @@ extern int create_mem_file(unsigned long long len);
 extern void report_enomem(void);
 
 /* process.c */
+pid_t os_reap_child(void);
 extern void os_alarm_process(int pid);
 extern void os_kill_process(int pid, int reap_child);
 extern void os_kill_ptraced_process(int pid, int reap_child);
@@ -286,7 +286,7 @@ int unmap(struct mm_id *mm_idp, unsigned long addr, unsigned long len);
 
 /* skas/process.c */
 extern int is_skas_winch(int pid, int fd, void *data);
-extern int start_userspace(unsigned long stub_stack);
+extern int start_userspace(struct mm_id *mm_id);
 extern void userspace(struct uml_pt_regs *regs);
 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 extern void switch_threads(jmp_buf *me, jmp_buf *you);
diff --git a/arch/um/include/shared/skas/mm_id.h b/arch/um/include/shared/skas/mm_id.h
index 140388c282f6..4f977ef5dda5 100644
--- a/arch/um/include/shared/skas/mm_id.h
+++ b/arch/um/include/shared/skas/mm_id.h
@@ -6,12 +6,19 @@
 #ifndef __MM_ID_H
 #define __MM_ID_H
 
+#define STUB_MAX_FDS 4
+
 struct mm_id {
 	int pid;
 	unsigned long stack;
 	int syscall_data_len;
+
+	/* Only used with SECCOMP mode */
+	int sock;
+	int syscall_fd_num;
+	int syscall_fd_map[STUB_MAX_FDS];
 };
 
-void __switch_mm(struct mm_id *mm_idp);
+void notify_mm_kill(int pid);
 
 #endif
diff --git a/arch/um/include/shared/skas/skas.h b/arch/um/include/shared/skas/skas.h
index 85c50122ab98..807514e10538 100644
--- a/arch/um/include/shared/skas/skas.h
+++ b/arch/um/include/shared/skas/skas.h
@@ -8,7 +8,7 @@
 
 #include <sysdep/ptrace.h>
 
-extern int userspace_pid[];
+extern int using_seccomp;
 
 extern void new_thread_handler(void);
 extern void handle_syscall(struct uml_pt_regs *regs);
diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
index 81a4cace032c..c261a77a32f6 100644
--- a/arch/um/include/shared/skas/stub-data.h
+++ b/arch/um/include/shared/skas/stub-data.h
@@ -11,8 +11,15 @@
 #include <linux/compiler_types.h>
 #include <as-layout.h>
 #include <sysdep/tls.h>
+#include <sysdep/stub-data.h>
+#include <mm_id.h>
+
+#define FUTEX_IN_CHILD 0
+#define FUTEX_IN_KERN 1
 
 struct stub_init_data {
+	int seccomp;
+
 	unsigned long stub_start;
 
 	int stub_code_fd;
@@ -20,7 +27,8 @@ struct stub_init_data {
 	int stub_data_fd;
 	unsigned long stub_data_offset;
 
-	unsigned long segv_handler;
+	unsigned long signal_handler;
+	unsigned long signal_restorer;
 };
 
 #define STUB_NEXT_SYSCALL(s) \
@@ -52,6 +60,16 @@ struct stub_data {
 	/* 128 leaves enough room for additional fields in the struct */
 	struct stub_syscall syscall_data[(UM_KERN_PAGE_SIZE - 128) / sizeof(struct stub_syscall)] __aligned(16);
 
+	/* data shared with signal handler (only used in seccomp mode) */
+	short restart_wait;
+	unsigned int futex;
+	int signal;
+	unsigned short si_offset;
+	unsigned short mctx_offset;
+
+	/* seccomp architecture specific state restore */
+	struct stub_data_arch arch_data;
+
 	/* Stack for our signal handlers and for calling into . */
 	unsigned char sigstack[UM_KERN_PAGE_SIZE] __aligned(UM_KERN_PAGE_SIZE);
 };