Re: [Qemu-devel] [PATCH v2 3/4] linux-user: pass elf interpreter prefix in execve

[Joel Holdsworth <joel.holdsworth@vcatechnology.com>]

On 15/06/16 21:06, Laurent Vivier wrote:
> More details: why do we need this?
>
> Add your Signed-off-by.
>
> Le 14/06/2016 à 21:26, Joel Holdsworth a écrit :
>> ---
>>   linux-user/syscall.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
>> index 440986e..1513f0f 100644
>> --- a/linux-user/syscall.c
>> +++ b/linux-user/syscall.c
>> @@ -6667,7 +6667,7 @@ static abi_long qemu_execve(char *filename, char *argv[],
>>       char *i_arg = NULL, *i_name = NULL;
>>       char **qemu_argp, **argp;
>>       int i, j;
>> -    size_t qemu_argc = 3, argc, host_envc, envpc;
>> +    size_t qemu_argc = 5, argc, host_envc, envpc;
>>       int fd, ret;
>>       char *cp;
>>       size_t def_envc = 0, undef_envc = 0;
>> @@ -6782,6 +6782,8 @@ static abi_long qemu_execve(char *filename, char *argv[],
>>   
>>       /* set up the qemu arguments */
>>       *argp++ = strdup(qemu_execve_path);
>> +    *argp++ = strdup("-L");
>> +    *argp++ = strdup(path("/"));
> why "/"?
>
> You should propagate the one from the parent (if != NULL).

path("/") seems to be the easiest way to get access to 'static struct 
pathelem *base' in util/path.c, which is set from the parent's -L<path> 
in init_paths.