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Ignore user-supplied fd redirections above 2 for builtins

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Prevents e.g. specifying an fd which corresponds to the history file
as the stdin for builtin_source
This commit is contained in:
ridiculousfish 2015-01-08 10:44:05 -08:00
parent 7864d0d416
commit 34db67680d
3 changed files with 14 additions and 6 deletions
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10
exec.cpp
View file

@ -366,7 +366,7 @@ static bool io_transmogrify(const io_chain_t &in_chain, io_chain_t *out_chain, s
}
opened_fds.push_back(fd);
out.reset(new io_fd_t(in->fd, fd));
out.reset(new io_fd_t(in->fd, fd, false));
break;
}
@ -867,7 +867,7 @@ void exec_job(parser_t &parser, job_t *j)
case INTERNAL_BUILTIN:
{
int local_builtin_stdin = 0;
int local_builtin_stdin = STDIN_FILENO;
bool close_stdin = false;
/*
@ -887,7 +887,11 @@ void exec_job(parser_t &parser, job_t *j)
case IO_FD:
{
CAST_INIT(const io_fd_t *, in_fd, in.get());
local_builtin_stdin = in_fd->old_fd;
/* Ignore user-supplied fd redirections from an fd other than the standard ones. e.g. in source <&3 don't actually read from fd 3, which is internal to fish. We still respect this redirection in that we pass it on as a block IO to the code that source runs, and therefore this is not an error. Non-user supplied fd redirections come about through transmogrification, and we need to respect those here. */
if (! in_fd->user_supplied || (in_fd->old_fd >= 0 && in_fd->old_fd < 3))
{
local_builtin_stdin = in_fd->old_fd;
}
break;
}
case IO_PIPE:

8
io.h
View file

@ -66,11 +66,15 @@ public:
/** fd to redirect specified fd to. For example, in 2>&1, old_fd is 1, and io_data_t::fd is 2 */
const int old_fd;
/** Whether this redirection was supplied by a script. For example, 'cmd <&3' would have user_supplied set to true. But a redirection that comes about through transmogrification would not. */
const bool user_supplied;
virtual void print() const;
io_fd_t(int f, int old) :
io_fd_t(int f, int old, bool us) :
io_data_t(IO_FD, f),
old_fd(old)
old_fd(old),
user_supplied(us)
{
}
};

2
parse_execution.cpp
View file

@ -1083,7 +1083,7 @@ bool parse_execution_context_t::determine_io_chain(const parse_node_t &statement
}
else
{
new_io.reset(new io_fd_t(source_fd, old_fd));
new_io.reset(new io_fd_t(source_fd, old_fd, true));
}
}
break;