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radv: add a secure_compile_open_fifo_fds() helper

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This will be used to create a communication pipe between the user
facing device and a freshly forked (per pipeline compile) slim copy
of that device.

We can't use pipe() here because the fork will not be a direct fork
of the user facing process. Instead we use a previously forked
copy of the process that was forked at device creation in order to
reduce the resources required for the fork and avoid performance
issues.

Fixes: cff53da374 ("radv: enable secure compile support")
This commit is contained in:
Timothy Arceri 2019-11-13 14:51:48 +11:00
parent ef54f15da9
commit 1663bb1f77
1 changed files with 43 additions and 0 deletions
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43
src/amd/vulkan/radv_device.c
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@ -2209,6 +2209,49 @@ static bool radv_close_all_fds(const int *keep_fds, int keep_fd_count)
return true;
}
static bool secure_compile_open_fifo_fds(struct radv_secure_compile_state *sc,
int *fd_server, int *fd_client,
unsigned process, bool make_fifo)
{
bool result = false;
char *fifo_server_path = NULL;
char *fifo_client_path = NULL;
if (asprintf(&fifo_server_path, "/tmp/radv_server_%s_%u", sc->uid, process) == -1)
goto open_fifo_exit;
if (asprintf(&fifo_client_path, "/tmp/radv_client_%s_%u", sc->uid, process) == -1)
goto open_fifo_exit;
if (make_fifo) {
int file1 = mkfifo(fifo_server_path, 0666);
if(file1 < 0)
goto open_fifo_exit;
int file2 = mkfifo(fifo_client_path, 0666);
if(file2 < 0)
goto open_fifo_exit;
}
*fd_server = open(fifo_server_path, O_RDWR);
if(*fd_server < 1)
goto open_fifo_exit;
*fd_client = open(fifo_client_path, O_RDWR);
if(*fd_client < 1) {
close(*fd_server);
goto open_fifo_exit;
}
result = true;
open_fifo_exit:
free(fifo_server_path);
free(fifo_client_path);
return result;
}
static void run_secure_compile_device(struct radv_device *device, unsigned process,
int fd_secure_input, int fd_secure_output)
{