Imperial-MEng/pintos_22
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Update validate_user_pointer to start from the beginning of the page rather than the given ptr

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sBubshait
2024-11-15 13:49:58 +00:00
parent 1c757ecdfe
commit 82d45880f7
1 changed files with 1 additions and 1 deletions
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src/userprog/syscall.c
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@@ -475,7 +475,7 @@ validate_user_pointer (const void *start, size_t size)
/* We now need to check if the entire memory block is mapped to physical /* We now need to check if the entire memory block is mapped to physical
memory by the page table. */ memory by the page table. */
for (const void *ptr = start; ptr <= end; ptr += PGSIZE) for (const void *ptr = pg_round_down (start); ptr <= end; ptr += PGSIZE)
if (pagedir_get_page (thread_current ()->pagedir, ptr) == NULL) if (pagedir_get_page (thread_current ()->pagedir, ptr) == NULL)
syscall_exit (EXIT_FAILURE); syscall_exit (EXIT_FAILURE);
} }