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d11dd0c3f9
The endpoint receive syscalls can block and then write to userspace memory. Since the current address space may be different after blocking, make sure to only actually write to the user memory after returning to the syscall handler - pass values that are on the syscall handler stack deeper into the kernel.
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
#include "j6/errors.h"
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#include "j6/types.h"
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#include "log.h"
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#include "objects/endpoint.h"
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#include "syscalls/helpers.h"
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namespace syscalls {
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j6_status_t
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endpoint_create(j6_handle_t *handle)
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{
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construct_handle<endpoint>(handle);
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return j6_status_ok;
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}
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j6_status_t
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endpoint_send(j6_handle_t handle, j6_tag_t tag, size_t len, void *data)
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{
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if (tag & j6_tag_system_flag)
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return j6_err_invalid_arg;
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endpoint *e = get_handle<endpoint>(handle);
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if (!e) return j6_err_invalid_arg;
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return e->send(tag, len, data);
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}
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j6_status_t
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endpoint_receive(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
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{
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if (!tag || !len || (*len && !data))
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return j6_err_invalid_arg;
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endpoint *e = get_handle<endpoint>(handle);
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if (!e) return j6_err_invalid_arg;
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j6_tag_t out_tag = j6_tag_invalid;
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size_t out_len = 0;
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j6_status_t s = e->receive(&out_tag, &out_len, data);
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*tag = out_tag;
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*len = out_len;
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return s;
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}
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j6_status_t
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endpoint_sendrecv(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
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{
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if (!tag || (*tag & j6_tag_system_flag))
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return j6_err_invalid_arg;
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endpoint *e = get_handle<endpoint>(handle);
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if (!e) return j6_err_invalid_arg;
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j6_status_t status = e->send(*tag, *len, data);
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if (status != j6_status_ok)
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return status;
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j6_tag_t out_tag = j6_tag_invalid;
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size_t out_len = 0;
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j6_status_t s = e->receive(&out_tag, &out_len, data);
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*tag = out_tag;
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*len = out_len;
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return s;
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}
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} // namespace syscalls
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