Deleted vendor folder

1 files changed, 0 insertions, 313 deletions

diff --git a/vendor/rustix/src/backend/linux_raw/vdso.rs b/vendor/rustix/src/backend/linux_raw/vdso.rs
deleted file mode 100644
index 102fa6b..0000000
--- a/vendor/rustix/src/backend/linux_raw/vdso.rs
+++ /dev/null
@@ -1,313 +0,0 @@
-//! Parse the Linux vDSO.
-//!
-//! The following code is transliterated from
-//! tools/testing/selftests/vDSO/parse_vdso.c in Linux 5.11, which is licensed
-//! with Creative Commons Zero License, version 1.0,
-//! available at <https://creativecommons.org/publicdomain/zero/1.0/legalcode>
-//!
-//! # Safety
-//!
-//! Parsing the vDSO involves a lot of raw pointer manipulation. This
-//! implementation follows Linux's reference implementation, and adds several
-//! additional safety checks.
-#![allow(unsafe_code)]
-
-use super::c;
-use crate::ffi::CStr;
-use crate::utils::check_raw_pointer;
-use core::ffi::c_void;
-use core::mem::size_of;
-use core::ptr::{null, null_mut};
-use linux_raw_sys::elf::*;
-
-pub(super) struct Vdso {
-    // Load information
-    load_addr: *const Elf_Ehdr,
-    load_end: *const c_void, // the end of the `PT_LOAD` segment
-    pv_offset: usize,        // recorded paddr - recorded vaddr
-
-    // Symbol table
-    symtab: *const Elf_Sym,
-    symstrings: *const u8,
-    bucket: *const u32,
-    chain: *const u32,
-    nbucket: u32,
-    //nchain: u32,
-
-    // Version table
-    versym: *const u16,
-    verdef: *const Elf_Verdef,
-}
-
-// Straight from the ELF specification.
-fn elf_hash(name: &CStr) -> u32 {
-    let mut h: u32 = 0;
-    for b in name.to_bytes() {
-        h = (h << 4).wrapping_add(u32::from(*b));
-        let g = h & 0xf000_0000;
-        if g != 0 {
-            h ^= g >> 24;
-        }
-        h &= !g;
-    }
-    h
-}
-
-/// Create a `Vdso` value by parsing the vDSO at the `sysinfo_ehdr` address.
-fn init_from_sysinfo_ehdr() -> Option<Vdso> {
-    // SAFETY: The auxv initialization code does extensive checks to ensure
-    // that the value we get really is an `AT_SYSINFO_EHDR` value from the
-    // kernel.
-    unsafe {
-        let hdr = super::param::auxv::sysinfo_ehdr();
-
-        // If the platform doesn't provide a `AT_SYSINFO_EHDR`, we can't locate
-        // the vDSO.
-        if hdr.is_null() {
-            return None;
-        }
-
-        let mut vdso = Vdso {
-            load_addr: hdr,
-            load_end: hdr.cast(),
-            pv_offset: 0,
-            symtab: null(),
-            symstrings: null(),
-            bucket: null(),
-            chain: null(),
-            nbucket: 0,
-            //nchain: 0,
-            versym: null(),
-            verdef: null(),
-        };
-
-        let hdr = &*hdr;
-        let pt = check_raw_pointer::<Elf_Phdr>(vdso.base_plus(hdr.e_phoff)? as *mut _)?.as_ptr();
-        let mut dyn_: *const Elf_Dyn = null();
-        let mut num_dyn = 0;
-
-        // We need two things from the segment table: the load offset
-        // and the dynamic table.
-        let mut found_vaddr = false;
-        for i in 0..hdr.e_phnum {
-            let phdr = &*pt.add(i as usize);
-            if phdr.p_flags & PF_W != 0 {
-                // Don't trust any vDSO that claims to be loading writable
-                // segments into memory.
-                return None;
-            }
-            if phdr.p_type == PT_LOAD && !found_vaddr {
-                // The segment should be readable and executable, because it
-                // contains the symbol table and the function bodies.
-                if phdr.p_flags & (PF_R | PF_X) != (PF_R | PF_X) {
-                    return None;
-                }
-                found_vaddr = true;
-                vdso.load_end = vdso.base_plus(phdr.p_offset.checked_add(phdr.p_memsz)?)?;
-                vdso.pv_offset = phdr.p_offset.wrapping_sub(phdr.p_vaddr);
-            } else if phdr.p_type == PT_DYNAMIC {
-                // If `p_offset` is zero, it's more likely that we're looking
-                // at memory that has been zeroed than that the kernel has
-                // somehow aliased the `Ehdr` and the `Elf_Dyn` array.
-                if phdr.p_offset < size_of::<Elf_Ehdr>() {
-                    return None;
-                }
-
-                dyn_ = check_raw_pointer::<Elf_Dyn>(vdso.base_plus(phdr.p_offset)? as *mut _)?
-                    .as_ptr();
-                num_dyn = phdr.p_memsz / size_of::<Elf_Dyn>();
-            } else if phdr.p_type == PT_INTERP || phdr.p_type == PT_GNU_RELRO {
-                // Don't trust any ELF image that has an “interpreter” or
-                // that uses RELRO, which is likely to be a user ELF image
-                // rather and not the kernel vDSO.
-                return None;
-            }
-        }
-
-        if !found_vaddr || dyn_.is_null() {
-            return None; // Failed
-        }
-
-        // Fish out the useful bits of the dynamic table.
-        let mut hash: *const u32 = null();
-        vdso.symstrings = null();
-        vdso.symtab = null();
-        vdso.versym = null();
-        vdso.verdef = null();
-        let mut i = 0;
-        loop {
-            if i == num_dyn {
-                return None;
-            }
-            let d = &*dyn_.add(i);
-            match d.d_tag {
-                DT_STRTAB => {
-                    vdso.symstrings =
-                        check_raw_pointer::<u8>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
-                            .as_ptr();
-                }
-                DT_SYMTAB => {
-                    vdso.symtab =
-                        check_raw_pointer::<Elf_Sym>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
-                            .as_ptr();
-                }
-                DT_HASH => {
-                    hash = check_raw_pointer::<u32>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
-                        .as_ptr();
-                }
-                DT_VERSYM => {
-                    vdso.versym =
-                        check_raw_pointer::<u16>(vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _)?
-                            .as_ptr();
-                }
-                DT_VERDEF => {
-                    vdso.verdef = check_raw_pointer::<Elf_Verdef>(
-                        vdso.addr_from_elf(d.d_un.d_ptr)? as *mut _,
-                    )?
-                    .as_ptr();
-                }
-                DT_SYMENT => {
-                    if d.d_un.d_ptr != size_of::<Elf_Sym>() {
-                        return None; // Failed
-                    }
-                }
-                DT_NULL => break,
-                _ => {}
-            }
-            i = i.checked_add(1)?;
-        }
-        // The upstream code checks `symstrings`, `symtab`, and `hash` for
-        // null; here, `check_raw_pointer` has already done that.
-
-        if vdso.verdef.is_null() {
-            vdso.versym = null();
-        }
-
-        // Parse the hash table header.
-        vdso.nbucket = *hash.add(0);
-        //vdso.nchain = *hash.add(1);
-        vdso.bucket = hash.add(2);
-        vdso.chain = hash.add(vdso.nbucket as usize + 2);
-
-        // That's all we need.
-        Some(vdso)
-    }
-}
-
-impl Vdso {
-    /// Parse the vDSO.
-    ///
-    /// Returns `None` if the vDSO can't be located or if it doesn't conform to
-    /// our expectations.
-    #[inline]
-    pub(super) fn new() -> Option<Self> {
-        init_from_sysinfo_ehdr()
-    }
-
-    /// Check the version for a symbol.
-    ///
-    /// # Safety
-    ///
-    /// The raw pointers inside `self` must be valid.
-    unsafe fn match_version(&self, mut ver: u16, name: &CStr, hash: u32) -> bool {
-        // This is a helper function to check if the version indexed by
-        // ver matches name (which hashes to hash).
-        //
-        // The version definition table is a mess, and I don't know how
-        // to do this in better than linear time without allocating memory
-        // to build an index. I also don't know why the table has
-        // variable size entries in the first place.
-        //
-        // For added fun, I can't find a comprehensible specification of how
-        // to parse all the weird flags in the table.
-        //
-        // So I just parse the whole table every time.
-
-        // First step: find the version definition
-        ver &= 0x7fff; // Apparently bit 15 means "hidden"
-        let mut def = self.verdef;
-        loop {
-            if (*def).vd_version != VER_DEF_CURRENT {
-                return false; // Failed
-            }
-
-            if ((*def).vd_flags & VER_FLG_BASE) == 0 && ((*def).vd_ndx & 0x7fff) == ver {
-                break;
-            }
-
-            if (*def).vd_next == 0 {
-                return false; // No definition.
-            }
-
-            def = def
-                .cast::<u8>()
-                .add((*def).vd_next as usize)
-                .cast::<Elf_Verdef>();
-        }
-
-        // Now figure out whether it matches.
-        let aux = &*(def.cast::<u8>())
-            .add((*def).vd_aux as usize)
-            .cast::<Elf_Verdaux>();
-        (*def).vd_hash == hash
-            && (name == CStr::from_ptr(self.symstrings.add(aux.vda_name as usize).cast()))
-    }
-
-    /// Look up a symbol in the vDSO.
-    pub(super) fn sym(&self, version: &CStr, name: &CStr) -> *mut c::c_void {
-        let ver_hash = elf_hash(version);
-        let name_hash = elf_hash(name);
-
-        // SAFETY: The pointers in `self` must be valid.
-        unsafe {
-            let mut chain = *self.bucket.add((name_hash % self.nbucket) as usize);
-
-            while chain != STN_UNDEF {
-                let sym = &*self.symtab.add(chain as usize);
-
-                // Check for a defined global or weak function w/ right name.
-                //
-                // The reference parser in Linux's parse_vdso.c requires
-                // symbols to have type `STT_FUNC`, but on powerpc64, the vDSO
-                // uses `STT_NOTYPE`, so allow that too.
-                if (ELF_ST_TYPE(sym.st_info) != STT_FUNC &&
-                        ELF_ST_TYPE(sym.st_info) != STT_NOTYPE)
-                    || (ELF_ST_BIND(sym.st_info) != STB_GLOBAL
-                        && ELF_ST_BIND(sym.st_info) != STB_WEAK)
-                    || sym.st_shndx == SHN_UNDEF
-                    || sym.st_shndx == SHN_ABS
-                    || ELF_ST_VISIBILITY(sym.st_other) != STV_DEFAULT
-                    || (name != CStr::from_ptr(self.symstrings.add(sym.st_name as usize).cast()))
-                    // Check symbol version.
-                    || (!self.versym.is_null()
-                        && !self.match_version(*self.versym.add(chain as usize), version, ver_hash))
-                {
-                    chain = *self.chain.add(chain as usize);
-                    continue;
-                }
-
-                let sum = self.addr_from_elf(sym.st_value).unwrap();
-                assert!(
-                    sum as usize >= self.load_addr as usize
-                        && sum as usize <= self.load_end as usize
-                );
-                return sum as *mut c::c_void;
-            }
-        }
-
-        null_mut()
-    }
-
-    /// Add the given address to the vDSO base address.
-    unsafe fn base_plus(&self, offset: usize) -> Option<*const c_void> {
-        // Check for overflow.
-        let _ = (self.load_addr as usize).checked_add(offset)?;
-        // Add the offset to the base.
-        Some(self.load_addr.cast::<u8>().add(offset).cast())
-    }
-
-    /// Translate an ELF-address-space address into a usable virtual address.
-    unsafe fn addr_from_elf(&self, elf_addr: usize) -> Option<*const c_void> {
-        self.base_plus(elf_addr.wrapping_add(self.pv_offset))
-    }
-}