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Don't let a mismatch AT_SYSINFO_EHDR image preclude use of AUX values. #1484

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Merged
sunfishcode merged 2 commits into from
Jul 15, 2025
Merged

Don't let a mismatch AT_SYSINFO_EHDR image preclude use of AUX values. #1484

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52096f3
Don't let a mismatch AT_SYSINFO_EHDR image preclude use of AUX values.
sunfishcode Jun 28, 2025
61121bd
Fix a warning.
sunfishcode Jun 28, 2025
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17 changes: 7 additions & 10 deletions src/backend/linux_raw/param/auxv.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,7 @@ use core::sync::atomic::Ordering::Relaxed;
use core::sync::atomic::{AtomicPtr, AtomicUsize};
use linux_raw_sys::elf::*;
use linux_raw_sys::general::{
AT_BASE, AT_CLKTCK, AT_EXECFN, AT_HWCAP, AT_HWCAP2, AT_MINSIGSTKSZ, AT_NULL, AT_PAGESZ,
AT_SYSINFO_EHDR,
AT_CLKTCK, AT_EXECFN, AT_HWCAP, AT_HWCAP2, AT_MINSIGSTKSZ, AT_NULL, AT_PAGESZ, AT_SYSINFO_EHDR,
};
#[cfg(feature = "runtime")]
use linux_raw_sys::general::{
Expand Down Expand Up @@ -401,13 +400,12 @@ unsafe fn init_from_aux_iter(aux_iter: impl Iterator<Item = Elf_auxv_t>) -> Opti
AT_HWCAP2 => hwcap2 = a_val as usize,
AT_MINSIGSTKSZ => minsigstksz = a_val as usize,
AT_EXECFN => execfn = check_raw_pointer::<c::c_char>(a_val as *mut _)?.as_ptr(),
AT_SYSINFO_EHDR => sysinfo_ehdr = check_elf_base(a_val as *mut _)?.as_ptr(),

AT_BASE => {
// The `AT_BASE` value can be null in a static executable that
// doesn't use a dynamic linker. If so, ignore it.
if !a_val.is_null() {
let _ = check_elf_base(a_val.cast())?;
// Use the `AT_SYSINFO_EHDR` if it matches the platform rustix is
// compiled for.
AT_SYSINFO_EHDR => {
if let Some(value) = check_elf_base(a_val as *mut _) {
sysinfo_ehdr = value.as_ptr();
}
}

Expand Down Expand Up @@ -448,8 +446,7 @@ unsafe fn init_from_aux_iter(aux_iter: impl Iterator<Item = Elf_auxv_t>) -> Opti
secure = 2;
}

// The base and sysinfo_ehdr (if present) matches our platform. Accept the
// aux values.
// Accept the aux values.
PAGE_SIZE.store(pagesz, Relaxed);
CLOCK_TICKS_PER_SECOND.store(clktck, Relaxed);
HWCAP.store(hwcap, Relaxed);
Expand Down
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