* [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe
@ 2009-01-30 20:09 Aurelien Jarno
2009-02-02 7:59 ` Laurent Desnogues
0 siblings, 1 reply; 3+ messages in thread
From: Aurelien Jarno @ 2009-01-30 20:09 UTC (permalink / raw)
To: qemu-devel
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 <riku.voipio@iki.fi>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Modified Paths:
--------------
trunk/linux-user/main.c
trunk/linux-user/qemu.h
trunk/linux-user/syscall.c
Modified: trunk/linux-user/main.c
===================================================================
--- trunk/linux-user/main.c 2009-01-30 19:59:17 UTC (rev 6484)
+++ trunk/linux-user/main.c 2009-01-30 20:09:01 UTC (rev 6485)
@@ -37,6 +37,8 @@
#define DEBUG_LOGFILE "/tmp/qemu.log"
+char *exec_path;
+
static const char *interp_prefix = CONFIG_QEMU_PREFIX;
const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
@@ -2341,6 +2343,7 @@
if (optind >= argc)
usage();
filename = argv[optind];
+ exec_path = argv[optind];
/* Zero out regs */
memset(regs, 0, sizeof(struct target_pt_regs));
Modified: trunk/linux-user/qemu.h
===================================================================
--- trunk/linux-user/qemu.h 2009-01-30 19:59:17 UTC (rev 6484)
+++ trunk/linux-user/qemu.h 2009-01-30 20:09:01 UTC (rev 6485)
@@ -120,6 +120,7 @@
uint8_t stack[0];
} __attribute__((aligned(16))) TaskState;
+extern char *exec_path;
void init_task_state(TaskState *ts);
extern const char *qemu_uname_release;
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;
+ }
unlock_user(p2, arg2, ret);
unlock_user(p, arg1, 0);
}
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe
2009-01-30 20:09 [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe Aurelien Jarno
@ 2009-02-02 7:59 ` Laurent Desnogues
2009-02-02 9:15 ` Riku Voipio
0 siblings, 1 reply; 3+ messages in thread
From: Laurent Desnogues @ 2009-02-02 7:59 UTC (permalink / raw)
To: qemu-devel
On Fri, Jan 30, 2009 at 9:09 PM, Aurelien Jarno <aurelien@aurel32.net> 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 <riku.voipio@iki.fi>
> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
>
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-01-30 20:09 [Qemu-devel] [6485] linux-user: identify running binary in /proc/self/exe Aurelien Jarno
2009-02-02 7:59 ` Laurent Desnogues
2009-02-02 9:15 ` Riku Voipio
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