diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/std/os/linux/vdso.zig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/std/os/linux/vdso.zig b/lib/std/os/linux/vdso.zig index dc056ddba4..beb98a063d 100644 --- a/lib/std/os/linux/vdso.zig +++ b/lib/std/os/linux/vdso.zig @@ -22,6 +22,10 @@ pub fn lookup(vername: []const u8, name: []const u8) usize { }) { const this_ph = @intToPtr(*elf.Phdr, ph_addr); switch (this_ph.p_type) { + // On WSL1 as well as older kernels, the VDSO ELF image is pre-linked in the upper half + // of the memory space (e.g. p_vaddr = 0xffffffffff700000 on WSL1). + // Wrapping operations are used on this line as well as subsequent calculations relative to base + // (lines 47, 78) to ensure no overflow check is tripped. elf.PT_LOAD => base = vdso_addr +% this_ph.p_offset -% this_ph.p_vaddr, elf.PT_DYNAMIC => maybe_dynv = @intToPtr([*]usize, vdso_addr + this_ph.p_offset), else => {}, |