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Pass PROT_READ to mmap when the segment has PF_R

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This will allow the kernel to not add an implicit PROT_READ for every
mmap in the future.
This commit is contained in:
bjorn3
2025-04-12 20:13:39 +02:00
parent 095646517d
commit 050edcdcc6
1 changed files with 7 additions and 3 deletions
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redox-rt/src/proc.rs
+7 -3
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@@ -8,12 +8,12 @@ use alloc::{boxed::Box, collections::BTreeMap, vec};
#[cfg(target_pointer_width = "32")]
use goblin::elf32::{
header::Header,
program_header::program_header32::{ProgramHeader, PF_W, PF_X, PT_INTERP, PT_LOAD},
program_header::program_header32::{ProgramHeader, PF_R, PF_W, PF_X, PT_INTERP, PT_LOAD},
};
#[cfg(target_pointer_width = "64")]
use goblin::elf64::{
header::Header,
program_header::program_header64::{ProgramHeader, PF_W, PF_X, PT_INTERP, PT_LOAD},
program_header::program_header64::{ProgramHeader, PF_R, PF_W, PF_X, PT_INTERP, PT_LOAD},
};
use syscall::{
@@ -114,7 +114,11 @@ where
let ph_bytes = &phs[ph_idx * phentsize..(ph_idx + 1) * phentsize];
let segment: &ProgramHeader =
plain::from_bytes(ph_bytes).map_err(|_| Error::new(EINVAL))?;
let mut flags = syscall::PROT_READ;
let mut flags = if segment.p_flags & PF_R == PF_R {
syscall::PROT_READ
} else {
syscall::PROT_NONE
};
// W ^ X. If it is executable, do not allow it to be writable, even if requested
if segment.p_flags & PF_X == PF_X {