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Remove redundant empty page in init stack

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Jianfeng Jiang 2024-04-22 03:30:53 +00:00 committed by Tate, Hongliang Tian
parent c335873d12
commit c778e0c07c
1 changed files with 3 additions and 8 deletions
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11
kernel/aster-nix/src/process/program_loader/elf/init_stack.rs
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@ -176,14 +176,9 @@ impl InitStack {
ldso_load_info: &Option<LdsoLoadInfo>,
aux_vec: &mut AuxVec,
) -> Result<()> {
// write a zero page. When a user program tries to read a cstring(like argv) from init stack,
// it will typically read 4096 bytes and then find the first '\0' in the buffer
// (we now read 128 bytes, which is set by MAX_FILENAME_LEN).
// If we don't have this zero page, the read may go into guard page,
// which will cause unrecoverable page fault(The guard page is not backed up by any vmo).
// So we add a zero page here, to ensure the read will not go into guard page.
// FIXME: Some other OSes put the first page of excutable file here.
self.write_bytes(&[0u8; PAGE_SIZE], root_vmar)?;
// FIXME: Some OSes may put the first page of excutable file here
// for interpreting elf headers.
// write envp string
let envp_pointers = self.write_envp_strings(root_vmar)?;
// write argv string