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Re: [Qemu-devel] [6485] linux-user: identify running binary in /proc/se
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe |
Date: |
Mon, 2 Feb 2009 08:59:14 +0100 |
On Fri, Jan 30, 2009 at 9:09 PM, Aurelien Jarno <address@hidden> wrote:
> Revision: 6485
> http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6485
> Author: aurel32
> Date: 2009-01-30 20:09:01 +0000 (Fri, 30 Jan 2009)
>
> Log Message:
> -----------
> linux-user: identify running binary in /proc/self/exe
>
> Some applications like to test /proc/self/exe to find
> out who they are. Fake the result of readlink() for
> them. Use realpath() to return full path to binary
> (which the links /proc/self/exe are)
>
> Signed-off-by: Riku Voipio <address@hidden>
> Signed-off-by: Aurelien Jarno <address@hidden>
>
> Modified Paths:
> --------------
> trunk/linux-user/main.c
> trunk/linux-user/qemu.h
> trunk/linux-user/syscall.c
>
[...]
> Modified: trunk/linux-user/syscall.c
> ===================================================================
> --- trunk/linux-user/syscall.c 2009-01-30 19:59:17 UTC (rev 6484)
> +++ trunk/linux-user/syscall.c 2009-01-30 20:09:01 UTC (rev 6485)
> @@ -4410,13 +4410,22 @@
> #endif
> case TARGET_NR_readlink:
> {
> - void *p2;
> + void *p2, *temp;
> p = lock_user_string(arg1);
> p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
> if (!p || !p2)
> ret = -TARGET_EFAULT;
> - else
> - ret = get_errno(readlink(path(p), p2, arg3));
> + else {
> + if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) {
> + char real[PATH_MAX];
> + temp = realpath(exec_path,real);
> + ret = (temp==NULL) ? get_errno(-1) : strlen(real) ;
> + snprintf((char *)p2, arg3, "%s", real);
> + }
> + else
> + ret = get_errno(readlink(path(p), p2, arg3));
> + break;
Do we really want to skip unlock_user?
> + }
> unlock_user(p2, arg2, ret);
> unlock_user(p, arg1, 0);
> }
Laurent
- Re: [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe,
Laurent Desnogues <=