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Diffstat (limited to 'arch/um/kernel/process.c')
-rw-r--r--arch/um/kernel/process.c51
1 files changed, 19 insertions, 32 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index f76a269..1b5ef3e 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -30,7 +30,6 @@
#include "init.h"
#include "os.h"
#include "uml-config.h"
-#include "ptrace_user.h"
#include "choose-mode.h"
#include "mode.h"
#ifdef UML_CONFIG_MODE_SKAS
@@ -65,8 +64,6 @@ void init_new_thread_signals(int altstack)
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGUSR2, (__sighandler_t) sig_handler,
flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGHUP, SIG_IGN);
@@ -133,7 +130,7 @@ int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
return(arg.pid);
}
-static int ptrace_child(void *arg)
+static int ptrace_child(void)
{
int ret;
int pid = os_getpid(), ppid = getppid();
@@ -162,20 +159,16 @@ static int ptrace_child(void *arg)
_exit(ret);
}
-static int start_ptraced_child(void **stack_out)
+static int start_ptraced_child(void)
{
- void *stack;
- unsigned long sp;
int pid, n, status;
- stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if(stack == MAP_FAILED)
- panic("check_ptrace : mmap failed, errno = %d", errno);
- sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
- pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
+ pid = fork();
+ if(pid == 0)
+ ptrace_child();
+
if(pid < 0)
- panic("check_ptrace : clone failed, errno = %d", errno);
+ panic("check_ptrace : fork failed, errno = %d", errno);
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("check_ptrace : wait failed, errno = %d", errno);
@@ -183,7 +176,6 @@ static int start_ptraced_child(void **stack_out)
panic("check_ptrace : expected SIGSTOP, got status = %d",
status);
- *stack_out = stack;
return(pid);
}
@@ -191,12 +183,12 @@ static int start_ptraced_child(void **stack_out)
* just avoid using sysemu, not panic, but only if SYSEMU features are broken.
* So only for SYSEMU features we test mustpanic, while normal host features
* must work anyway!*/
-static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
+static int stop_ptraced_child(int pid, int exitcode, int mustexit)
{
int status, n, ret = 0;
if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
- panic("check_ptrace : ptrace failed, errno = %d", errno);
+ panic("stop_ptraced_child : ptrace failed, errno = %d", errno);
CATCH_EINTR(n = waitpid(pid, &status, 0));
if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
int exit_with = WEXITSTATUS(status);
@@ -207,15 +199,13 @@ static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
printk("check_ptrace : child exited with exitcode %d, while "
"expecting %d; status 0x%x", exit_with,
exitcode, status);
- if (mustpanic)
+ if (mustexit)
panic("\n");
else
printk("\n");
ret = -1;
}
- if(munmap(stack, PAGE_SIZE) < 0)
- panic("check_ptrace : munmap failed, errno = %d", errno);
return ret;
}
@@ -237,12 +227,11 @@ __uml_setup("nosysemu", nosysemu_cmd_param,
static void __init check_sysemu(void)
{
- void *stack;
int pid, syscall, n, status, count=0;
printk("Checking syscall emulation patch for ptrace...");
sysemu_supported = 0;
- pid = start_ptraced_child(&stack);
+ pid = start_ptraced_child();
if(ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
goto fail;
@@ -260,7 +249,7 @@ static void __init check_sysemu(void)
panic("check_sysemu : failed to modify system "
"call return, errno = %d", errno);
- if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+ if (stop_ptraced_child(pid, 0, 0) < 0)
goto fail_stopped;
sysemu_supported = 1;
@@ -268,7 +257,7 @@ static void __init check_sysemu(void)
set_using_sysemu(!force_sysemu_disabled);
printk("Checking advanced syscall emulation patch for ptrace...");
- pid = start_ptraced_child(&stack);
+ pid = start_ptraced_child();
while(1){
count++;
if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
@@ -293,7 +282,7 @@ static void __init check_sysemu(void)
break;
}
}
- if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+ if (stop_ptraced_child(pid, 0, 0) < 0)
goto fail_stopped;
sysemu_supported = 2;
@@ -304,18 +293,17 @@ static void __init check_sysemu(void)
return;
fail:
- stop_ptraced_child(pid, stack, 1, 0);
+ stop_ptraced_child(pid, 1, 0);
fail_stopped:
printk("missing\n");
}
void __init check_ptrace(void)
{
- void *stack;
int pid, syscall, n, status;
printk("Checking that ptrace can change system call numbers...");
- pid = start_ptraced_child(&stack);
+ pid = start_ptraced_child();
if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
panic("check_ptrace: PTRACE_SETOPTIONS failed, errno = %d", errno);
@@ -342,7 +330,7 @@ void __init check_ptrace(void)
break;
}
}
- stop_ptraced_child(pid, stack, 0, 1);
+ stop_ptraced_child(pid, 0, 1);
printk("OK\n");
check_sysemu();
}
@@ -374,11 +362,10 @@ void forward_pending_sigio(int target)
static inline int check_skas3_ptrace_support(void)
{
struct ptrace_faultinfo fi;
- void *stack;
int pid, n, ret = 1;
printf("Checking for the skas3 patch in the host...");
- pid = start_ptraced_child(&stack);
+ pid = start_ptraced_child();
n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
if (n < 0) {
@@ -393,7 +380,7 @@ static inline int check_skas3_ptrace_support(void)
}
init_registers(pid);
- stop_ptraced_child(pid, stack, 1, 1);
+ stop_ptraced_child(pid, 1, 1);
return(ret);
}
generated by cgit v0.10.2 at 2024-11-17 12:03:08 (GMT)