kernel: generic user_memcpy() should clear_ac after the fault handler returns

the AC flag in eflags/rflags, pushed in the iframe by the CPU, is kept intact after handling the exception, since the fault handler is run with the faulted iframe and does a simple jump. The AC flag would otherwise be set until the syscall returns to userland.

Change-Id: I24f763032ab98029dd162fb411e1541586451606
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4040
Reviewed-by: Adrien Destugues <[email protected]>
Tested-by: Commit checker robot <[email protected]>

This commit is contained in:

Jérôme Duval

2021-06-01 12:24:54 +00:00

committed by

Axel Dörfler

parent 4d0359955f

commit b25103cc9c

1 changed files with 1 additions and 0 deletions

									
										headers/private/kernel/arch/generic/user_memory.h
									
		+1
		
												View File
												
					@@ -70,6 +70,7 @@ bool user_access(Function function)

							clear_ac();

							clear_ac();

							return true;

							return true;

						}

						}

						clear_ac();

						return false;

						return false;

					}

					}