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authorAnton Arapov <anton@redhat.com>2012-10-29 11:15:37 +0100
committerAnton Arapov <anton@redhat.com>2012-10-29 11:15:37 +0100
commit7d558cd9c7b18e4b16953265aa0da45e63f3b968 (patch)
tree7135d5a810768c9c619346282ee9cfdf1765e225 /arch/um/kernel
parent985ef6b2108ed28ffd5f6630e1e0fce2e2a775f2 (diff)
downloadkernel-uprobes-f17.tar.gz
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kernel-uprobes-f17.zip
fedora kernel: cd394142aac30b5c751f25b517572e2448695641v3.6.3-2f17
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/exec.c25
-rw-r--r--arch/um/kernel/irq.c2
-rw-r--r--arch/um/kernel/process.c21
-rw-r--r--arch/um/kernel/ptrace.c71
-rw-r--r--arch/um/kernel/sigio.c3
-rw-r--r--arch/um/kernel/signal.c6
-rw-r--r--arch/um/kernel/skas/syscall.c6
-rw-r--r--arch/um/kernel/syscall.c24
-rw-r--r--arch/um/kernel/time.c2
-rw-r--r--arch/um/kernel/trap.c39
10 files changed, 99 insertions, 100 deletions
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
index 6cade936636..8c82786da82 100644
--- a/arch/um/kernel/exec.c
+++ b/arch/um/kernel/exec.c
@@ -39,34 +39,21 @@ void flush_thread(void)
void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
{
+ get_safe_registers(regs->regs.gp, regs->regs.fp);
PT_REGS_IP(regs) = eip;
PT_REGS_SP(regs) = esp;
-}
-EXPORT_SYMBOL(start_thread);
-
-static long execve1(const char *file,
- const char __user *const __user *argv,
- const char __user *const __user *env)
-{
- long error;
-
- error = do_execve(file, argv, env, &current->thread.regs);
- if (error == 0) {
- task_lock(current);
- current->ptrace &= ~PT_DTRACE;
+ current->ptrace &= ~PT_DTRACE;
#ifdef SUBARCH_EXECVE1
- SUBARCH_EXECVE1(&current->thread.regs.regs);
+ SUBARCH_EXECVE1(regs->regs);
#endif
- task_unlock(current);
- }
- return error;
}
+EXPORT_SYMBOL(start_thread);
long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env)
{
long err;
- err = execve1(file, argv, env);
+ err = do_execve(file, argv, env, &current->thread.regs);
if (!err)
UML_LONGJMP(current->thread.exec_buf, 1);
return err;
@@ -81,7 +68,7 @@ long sys_execve(const char __user *file, const char __user *const __user *argv,
filename = getname(file);
error = PTR_ERR(filename);
if (IS_ERR(filename)) goto out;
- error = execve1(filename, argv, env);
+ error = do_execve(filename, argv, env, &current->thread.regs);
putname(filename);
out:
return error;
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 00506c3d5d6..9883026f073 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -30,7 +30,7 @@ static struct irq_fd **last_irq_ptr = &active_fds;
extern void free_irqs(void);
-void sigio_handler(int sig, struct uml_pt_regs *regs)
+void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
struct irq_fd *irq_fd;
int n;
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index ccb9a9d283f..c5f5afa5074 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -151,12 +151,10 @@ void new_thread_handler(void)
* 0 if it just exits
*/
n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
- if (n == 1) {
- /* Handle any immediate reschedules or signals */
- interrupt_end();
+ if (n == 1)
userspace(&current->thread.regs.regs);
- }
- else do_exit(0);
+ else
+ do_exit(0);
}
/* Called magically, see new_thread_handler above */
@@ -175,9 +173,6 @@ void fork_handler(void)
current->thread.prev_sched = NULL;
- /* Handle any immediate reschedules or signals */
- interrupt_end();
-
userspace(&current->thread.regs.regs);
}
@@ -186,22 +181,22 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
struct pt_regs *regs)
{
void (*handler)(void);
+ int kthread = current->flags & PF_KTHREAD;
int ret = 0;
p->thread = (struct thread_struct) INIT_THREAD;
- if (current->thread.forking) {
+ if (!kthread) {
memcpy(&p->thread.regs.regs, &regs->regs,
sizeof(p->thread.regs.regs));
- UPT_SET_SYSCALL_RETURN(&p->thread.regs.regs, 0);
+ PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
if (sp != 0)
REGS_SP(p->thread.regs.regs.gp) = sp;
handler = fork_handler;
arch_copy_thread(&current->thread.arch, &p->thread.arch);
- }
- else {
+ } else {
get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
p->thread.request.u.thread = current->thread.request.u.thread;
handler = new_thread_handler;
@@ -209,7 +204,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
- if (current->thread.forking) {
+ if (!kthread) {
clear_flushed_tls(p);
/*
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 06b19039050..694d551c889 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -3,11 +3,12 @@
* Licensed under the GPL
*/
-#include "linux/audit.h"
-#include "linux/ptrace.h"
-#include "linux/sched.h"
-#include "asm/uaccess.h"
-#include "skas_ptrace.h"
+#include <linux/audit.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/tracehook.h>
+#include <asm/uaccess.h>
+#include <skas_ptrace.h>
@@ -162,48 +163,36 @@ static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
* PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
*/
-void syscall_trace(struct uml_pt_regs *regs, int entryexit)
+void syscall_trace_enter(struct pt_regs *regs)
{
- int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
- int tracesysgood;
-
- if (!entryexit)
- audit_syscall_entry(HOST_AUDIT_ARCH,
- UPT_SYSCALL_NR(regs),
- UPT_SYSCALL_ARG1(regs),
- UPT_SYSCALL_ARG2(regs),
- UPT_SYSCALL_ARG3(regs),
- UPT_SYSCALL_ARG4(regs));
- else
- audit_syscall_exit(regs);
-
- /* Fake a debug trap */
- if (is_singlestep)
- send_sigtrap(current, regs, 0);
+ audit_syscall_entry(HOST_AUDIT_ARCH,
+ UPT_SYSCALL_NR(&regs->regs),
+ UPT_SYSCALL_ARG1(&regs->regs),
+ UPT_SYSCALL_ARG2(&regs->regs),
+ UPT_SYSCALL_ARG3(&regs->regs),
+ UPT_SYSCALL_ARG4(&regs->regs));
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
- if (!(current->ptrace & PT_PTRACED))
- return;
+ tracehook_report_syscall_entry(regs);
+}
- /*
- * the 0x80 provides a way for the tracing parent to distinguish
- * between a syscall stop and SIGTRAP delivery
- */
- tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
- ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
+void syscall_trace_leave(struct pt_regs *regs)
+{
+ int ptraced = current->ptrace;
- if (entryexit) /* force do_signal() --> is_syscall() */
- set_thread_flag(TIF_SIGPENDING);
+ audit_syscall_exit(regs);
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
+ /* Fake a debug trap */
+ if (ptraced & PT_DTRACE)
+ send_sigtrap(current, &regs->regs, 0);
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ tracehook_report_syscall_exit(regs, 0);
+ /* force do_signal() --> is_syscall() */
+ if (ptraced & PT_PTRACED)
+ set_thread_flag(TIF_SIGPENDING);
}
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
index 2a163925576..c88211139a5 100644
--- a/arch/um/kernel/sigio.c
+++ b/arch/um/kernel/sigio.c
@@ -25,8 +25,7 @@ int write_sigio_irq(int fd)
int err;
err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
- IRQF_SAMPLE_RANDOM, "write sigio",
- NULL);
+ 0, "write sigio", NULL);
if (err) {
printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
"err = %d\n", err);
diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c
index 7362d58efc2..cc9c2350e41 100644
--- a/arch/um/kernel/signal.c
+++ b/arch/um/kernel/signal.c
@@ -22,9 +22,13 @@ static void handle_signal(struct pt_regs *regs, unsigned long signr,
struct k_sigaction *ka, siginfo_t *info)
{
sigset_t *oldset = sigmask_to_save();
+ int singlestep = 0;
unsigned long sp;
int err;
+ if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
+ singlestep = 1;
+
/* Did we come from a system call? */
if (PT_REGS_SYSCALL_NR(regs) >= 0) {
/* If so, check system call restarting.. */
@@ -61,7 +65,7 @@ static void handle_signal(struct pt_regs *regs, unsigned long signr,
if (err)
force_sigsegv(signr, current);
else
- signal_delivered(signr, info, ka, regs, 0);
+ signal_delivered(signr, info, ka, regs, singlestep);
}
static int kern_do_signal(struct pt_regs *regs)
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index 05fbeb480e0..86368a025a9 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -18,7 +18,7 @@ void handle_syscall(struct uml_pt_regs *r)
long result;
int syscall;
- syscall_trace(r, 0);
+ syscall_trace_enter(regs);
/*
* This should go in the declaration of syscall, but when I do that,
@@ -34,7 +34,7 @@ void handle_syscall(struct uml_pt_regs *r)
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);
- UPT_SET_SYSCALL_RETURN(r, result);
+ PT_REGS_SET_SYSCALL_RETURN(regs, result);
- syscall_trace(r, 1);
+ syscall_trace_leave(regs);
}
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index f958cb876ee..a4c6d8eee74 100644
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -17,25 +17,25 @@
long sys_fork(void)
{
- long ret;
-
- current->thread.forking = 1;
- ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
+ return do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
&current->thread.regs, 0, NULL, NULL);
- current->thread.forking = 0;
- return ret;
}
long sys_vfork(void)
{
- long ret;
-
- current->thread.forking = 1;
- ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
UPT_SP(&current->thread.regs.regs),
&current->thread.regs, 0, NULL, NULL);
- current->thread.forking = 0;
- return ret;
+}
+
+long sys_clone(unsigned long clone_flags, unsigned long newsp,
+ void __user *parent_tid, void __user *child_tid)
+{
+ if (!newsp)
+ newsp = UPT_SP(&current->thread.regs.regs);
+
+ return do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
+ child_tid);
}
long old_mmap(unsigned long addr, unsigned long len,
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index d1a23fb3190..5f76d4ba151 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -13,7 +13,7 @@
#include "kern_util.h"
#include "os.h"
-void timer_handler(int sig, struct uml_pt_regs *regs)
+void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
unsigned long flags;
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 3be60765c0e..0353b98ae35 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -172,7 +172,7 @@ void fatal_sigsegv(void)
os_dump_core();
}
-void segv_handler(int sig, struct uml_pt_regs *regs)
+void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
@@ -258,8 +258,11 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
return 0;
}
-void relay_signal(int sig, struct uml_pt_regs *regs)
+void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
+ struct faultinfo *fi;
+ struct siginfo clean_si;
+
if (!UPT_IS_USER(regs)) {
if (sig == SIGBUS)
printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
@@ -269,18 +272,40 @@ void relay_signal(int sig, struct uml_pt_regs *regs)
arch_examine_signal(sig, regs);
- current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
- force_sig(sig, current);
+ memset(&clean_si, 0, sizeof(clean_si));
+ clean_si.si_signo = si->si_signo;
+ clean_si.si_errno = si->si_errno;
+ clean_si.si_code = si->si_code;
+ switch (sig) {
+ case SIGILL:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGBUS:
+ case SIGTRAP:
+ fi = UPT_FAULTINFO(regs);
+ clean_si.si_addr = (void __user *) FAULT_ADDRESS(*fi);
+ current->thread.arch.faultinfo = *fi;
+#ifdef __ARCH_SI_TRAPNO
+ clean_si.si_trapno = si->si_trapno;
+#endif
+ break;
+ default:
+ printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d)\n",
+ sig, si->si_code);
+ }
+
+ force_sig_info(sig, &clean_si, current);
}
-void bus_handler(int sig, struct uml_pt_regs *regs)
+void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
if (current->thread.fault_catcher != NULL)
UML_LONGJMP(current->thread.fault_catcher, 1);
- else relay_signal(sig, regs);
+ else
+ relay_signal(sig, si, regs);
}
-void winch(int sig, struct uml_pt_regs *regs)
+void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);
}