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Init the memory for elf to zero

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LI Qing 2020-11-09 15:48:19 +08:00 committed by Tate, Hongliang Tian
parent 300518a101
commit 5f05c16700
1 changed files with 6 additions and 5 deletions
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11
src/libos/src/vm/process_vm.rs
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@ -172,6 +172,10 @@ impl<'a, 'b> ProcessVMBuilder<'a, 'b> {
fn init_elf_memory(elf_range: &VMRange, elf_file: &ElfFile) -> Result<()> {
// Destination buffer: ELF appeared in the process
let elf_proc_buf = unsafe { elf_range.as_slice_mut() };
// Set zero for the buffer
for b in &mut elf_proc_buf[..] {
*b = 0;
}
// Source buffer: ELF stored in the ELF file
let elf_file_buf = elf_file.as_slice();
// Init all loadable segements
@ -185,13 +189,10 @@ impl<'a, 'b> ProcessVMBuilder<'a, 'b> {
let mem_size = segment.mem_size() as usize;
debug_assert!(file_size <= mem_size);
// The first file_size bytes are loaded from the ELF file
// The first file_size bytes are loaded from the ELF file,
// the remaining (mem_size - file_size) bytes are zeros.
elf_proc_buf[mem_addr..mem_addr + file_size]
.copy_from_slice(&elf_file_buf[file_offset..file_offset + file_size]);
// The remaining (mem_size - file_size) bytes are zeros
for b in &mut elf_proc_buf[mem_addr + file_size..mem_addr + mem_size] {
*b = 0;
}
});
Ok(())
}