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properly zero memory on demand paging and mmap

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Matheus
2022-08-20 00:01:54 -03:00
parent c9762db4cc
commit 1ed7aafa46
2 changed files with 8 additions and 6 deletions
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src/sys/mm/vmm.c
+2
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@@ -580,6 +580,8 @@ bool vmm_dealwithrequest(void* addr, long error, bool user){
status = true; status = true;
memset(addr, 0, PAGE_SIZE);
done: done:
spinlock_release(lock); spinlock_release(lock);
src/sys/syscalls/mmap.c
+5 -5
View File
@@ -84,13 +84,13 @@ syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off
if(ret == NULL && (flags & MAP_FIXED) == 0) if(ret == NULL && (flags & MAP_FIXED) == 0)
ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen); ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen);
if(!ret){ if(!ret)
retv.errno = ENOMEM; retv.errno = ENOMEM;
if(flags & MAP_ANON) else{
memset(ret, 0, plen);
}
else
retv.ret = ret; retv.ret = ret;
if(hint && (flags & MAP_ANON))
memset(ret, 0, plen*PAGE_SIZE);
}
return retv; return retv;