Messages in this thread Patch in this message | | | Date | Sun, 14 Mar 2004 19:42:11 -0500 | From | Brian Gerst <> | Subject | [PATCH] x86 execve from kernel |
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Remove the jump through int $0x80 for execve from a kernel thread.
-- Brian Gerst diff -urN linux-bk/arch/i386/kernel/process.c linux/arch/i386/kernel/process.c --- linux-bk/arch/i386/kernel/process.c 2004-03-14 18:25:39.000000000 -0500 +++ linux/arch/i386/kernel/process.c 2004-03-14 19:39:47.333293016 -0500 @@ -630,6 +630,33 @@ } /* + * execs a userspace program from a kernel thread + */ +int execve(char *filename, char **argv, char **envp) +{ + struct pt_regs regs; + int error; + unsigned long flags; + + memset(®s, 0, sizeof(regs)); + regs.eflags = X86_EFLAGS_IF; + + error = do_execve(filename, + (char __user * __user *) argv, + (char __user * __user *) envp, + ®s); + if (error == 0) { + current->ptrace &= ~PT_DTRACE; + __asm__ __volatile__( + "movl %0,%%esp\n\t" + "movl %1,%%ebp\n\t" + "jmp resume_userspace\n\t" + : : "r" (®s), "r" (current_thread_info())); + } + return error; +} + +/* * These bracket the sleeping functions.. */ extern void scheduling_functions_start_here(void); diff -urN linux-bk/include/asm-i386/unistd.h linux/include/asm-i386/unistd.h --- linux-bk/include/asm-i386/unistd.h 2004-03-14 18:25:46.000000000 -0500 +++ linux/include/asm-i386/unistd.h 2004-03-14 19:12:38.000000000 -0500 @@ -395,7 +395,7 @@ static inline _syscall3(int,read,int,fd,char *,buf,off_t,count) static inline _syscall3(off_t,lseek,int,fd,off_t,offset,int,count) static inline _syscall1(int,dup,int,fd) -static inline _syscall3(int,execve,const char *,file,char **,argv,char **,envp) +extern int execve(char *, char **, char **); static inline _syscall3(int,open,const char *,file,int,flag,int,mode) static inline _syscall1(int,close,int,fd) static inline _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options) | |