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Noux: quote env values, fix #66

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When reading the values of environment variables supplied via Genode
config mechanism, the XML attribute values were taken as is. On the libc
side, however, the values are processed using Genode's 'Arg_string'
functions. When unquoted, 'Arg_string' expects values to be either
identifiers or numbers. In the general case, however, env values cannot
be expected to satisfy these requirements. Hence, it is better to always
quote these values when reading the XML config. An alternative (maybe
better) solution would be to not use the 'Arg_string' classes in the
libc side.
This commit is contained in:
Norman Feske 2012-01-08 21:15:43 +01:00
parent 1db46a2345
commit 8c3f832f09
1 changed files with 21 additions and 0 deletions
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21
ports/src/noux/main.cc
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@ -337,6 +337,26 @@ static Noux::Args const &args_of_init_process()
}
static void quote(char *buf, Genode::size_t buf_len)
{
char c = '"';
/*
* Make sure to leave space at the end of buffer for the finishing '"' and
* the null-termination.
*/
unsigned i = 0;
for (; c && (i + 2 < buf_len); i++)
{
char next_c = buf[i];
buf[i] = c;
c = next_c;
}
buf[i + 0] = '"';
buf[i + 1] = 0;
}
/**
* Return string containing the environment variables of init
*
@ -357,6 +377,7 @@ static char const *env_string_of_init_process()
arg_node.attribute("name").value(name_buf, sizeof(name_buf));
arg_node.attribute("value").value(value_buf, sizeof(value_buf));
quote(value_buf, sizeof(value_buf));
Genode::Arg_string::set_arg(env_buf, sizeof(env_buf),
name_buf, value_buf);