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automates the recognition of whether or not the host kernel has the skas patch applied. Makefile edits itself, and all gui is automated.master
freesource
22 years ago
7 changed files with 218 additions and 9 deletions
@ -0,0 +1,19 @@ |
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CC=gcc |
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CFLAGS=-Wall -O2 |
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SRC=skas-or-tt.c |
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OBJS=$(patsubst %.c,%.o, $(SRC)) |
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all: skas-or-tt |
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skas-or-tt: $(OBJS) |
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$(CC) $(CFLAGS) -o $@ $(OBJS) -o $@ |
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$(OBJS): %.o : %.c |
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$(CC) $(CFLAGS) -c $< -o $@ |
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$(OBJS): Makefile |
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clean: |
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rm -f *.o *.a core skas-or-tt |
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@ -0,0 +1,141 @@ |
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/*
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skas_or_tt Copyright (C) 2003 |
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Jonathan Rosenbaum <freesource@users.sourceforge.net> |
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A program to check for the existence of the skas patch in the host |
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kernel and /proc/mm. Basically borrowed/simplified from jdike's |
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process.c. This is a good way to learn about clone() and ptrace(). |
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*/ |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <wait.h> |
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#include <sys/mman.h> /* for mmap */ |
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#include <sys/ptrace.h> |
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#include <sys/types.h> |
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#include <sched.h> /* clone */ |
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#define PTRACE_FAULTINFO 52 |
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#define PAGE_SIZE 1024 |
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int main(void) |
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{ |
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int n, pid, ret = 1; |
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void *stack; |
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struct ptrace_faultinfo { |
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int is_write; |
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unsigned long addr; |
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}; |
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struct ptrace_faultinfo fi; |
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printf("Checking for the skas3 patch in the host..."); |
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pid = start_ptraced_child(&stack); |
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n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi); |
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if(n < 0){ |
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if(errno == EIO) |
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printf("not found\n"); |
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else printf("No (unexpected errno - %d)\n", errno); |
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ret = 0; |
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} |
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else printf("found\n"); |
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printf("Checking for /proc/mm..."); |
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if(access("/proc/mm", W_OK)){ |
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printf("not found\n"); |
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ret = 0; |
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} |
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else printf("found\n"); |
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kill(pid, SIGKILL); |
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return(ret); |
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} |
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int threadFunction( void* argument ) |
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{ |
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printf( "child thread exiting\n" ); |
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exit(0); |
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} |
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int os_getpid(void) |
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{ |
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return(getpid()); |
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} |
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void os_stop_process(int pid) |
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{ |
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kill(pid, SIGSTOP); |
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} |
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void os_kill_process(int pid, int reap_child) |
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{ |
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kill(pid, SIGKILL); |
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if(reap_child) |
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waitpid(pid, NULL, 0); |
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} |
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static int ptrace_child(void *arg) |
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{ |
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int pid = os_getpid(); |
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if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){ |
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perror("ptrace"); |
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os_kill_process(pid, 0); |
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} |
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os_stop_process(pid); |
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_exit(os_getpid() == pid); |
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} |
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int start_ptraced_child(void **stack_out) |
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{ |
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void *stack; |
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unsigned long sp; |
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int pid, n, status; |
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stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, |
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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if(stack == MAP_FAILED) |
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printf("check_ptrace : mmap failed, errno = %d", errno); |
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sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *); |
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pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL); |
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if(pid < 0) { |
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printf("check_ptrace : clone failed, errno = %d\n", errno); |
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exit(0); |
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} |
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n = waitpid(pid, &status, WUNTRACED); |
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if(n < 0) { |
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printf("check_ptrace : wait failed, errno = %d\n", errno); |
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exit(0); |
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} |
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if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) { |
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printf("check_ptrace : expected SIGSTOP, got status = %d\n", |
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status); |
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exit(0); |
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} |
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*stack_out = stack; |
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return(pid); |
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} |
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style. |
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* Emacs will notice this stuff at the end of the file and automatically |
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* adjust the settings for this buffer only. This must remain at the end |
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* of the file. |
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* --------------------------------------------------------------------------- |
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* Local variables: |
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* c-file-style: "linux" |
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* End: |
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*/ |
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