From e5cf6efa64e8571d39515920f2ddb84cf209fdfc Mon Sep 17 00:00:00 2001 From: Jeremy Soller Date: Sun, 31 Mar 2019 14:35:45 -0600 Subject: [PATCH] Support specification of stack with clone system call and CLONE_STACK flag --- Cargo.lock | 145 ++++++++++++++------------- Cargo.toml | 2 +- src/arch/x86_64/interrupt/syscall.rs | 10 +- src/context/context.rs | 2 +- src/scheme/sys/context.rs | 4 +- src/syscall/mod.rs | 10 +- src/syscall/process.rs | 54 ++++++---- syscall | 2 +- 8 files changed, 133 insertions(+), 96 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 96edceb..56d21d5 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,9 +1,9 @@ [[package]] name = "aho-corasick" -version = "0.6.9" +version = "0.7.3" source = "registry+https://github.com/rust-lang/crates.io-index" dependencies = [ - "memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)", + "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)", ] [[package]] @@ -21,13 +21,13 @@ source = 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: : "intel", "volatile"); + asm!(" + pop rbp + xor rax, rax + " + : : : : "intel", "volatile"); } diff --git a/src/context/context.rs b/src/context/context.rs index f5c568e..d21276d 100644 --- a/src/context/context.rs +++ b/src/context/context.rs @@ -148,7 +148,7 @@ pub struct Context { /// User heap pub heap: Option, /// User stack - pub stack: Option, + pub stack: Option, /// User signal stack pub sigstack: Option, /// User Thread local storage diff --git a/src/scheme/sys/context.rs b/src/scheme/sys/context.rs index c83a9f0..66bac71 100644 --- a/src/scheme/sys/context.rs +++ b/src/scheme/sys/context.rs @@ -75,7 +75,9 @@ pub fn resource() -> Result> { }); } if let Some(ref stack) = context.stack { - memory += stack.size(); + stack.with(|stack| { + memory += stack.size(); + }); } if let Some(ref sigstack) = context.sigstack { memory += sigstack.size(); diff --git a/src/syscall/mod.rs b/src/syscall/mod.rs index 399c4e0..66c25b3 100644 --- a/src/syscall/mod.rs +++ b/src/syscall/mod.rs @@ -93,7 +93,15 @@ pub fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize, bp: u SYS_GETPID => getpid().map(ContextId::into), SYS_GETPGID => getpgid(ContextId::from(b)).map(ContextId::into), SYS_GETPPID => getppid().map(ContextId::into), - SYS_CLONE => clone(b, bp).map(ContextId::into), + SYS_CLONE => { + let old_rsp = stack.rsp; + if b & flag::CLONE_STACK == flag::CLONE_STACK { + stack.rsp = c; + } + let ret = clone(b, bp).map(ContextId::into); + stack.rsp = old_rsp; + ret + }, SYS_EXIT => exit((b & 0xFF) << 8), SYS_KILL => kill(ContextId::from(b), c), SYS_WAITPID => waitpid(ContextId::from(b), c, d).map(ContextId::into), diff --git a/src/syscall/process.rs b/src/syscall/process.rs index 60afbf3..c5b0038 100644 --- a/src/syscall/process.rs +++ b/src/syscall/process.rs @@ -23,7 +23,7 @@ use scheme::FileHandle; use syscall; use syscall::data::{SigAction, Stat}; use syscall::error::*; -use syscall::flag::{CLONE_VFORK, CLONE_VM, CLONE_FS, CLONE_FILES, CLONE_SIGHAND, +use syscall::flag::{CLONE_VFORK, CLONE_VM, CLONE_FS, CLONE_FILES, CLONE_SIGHAND, CLONE_STACK, PROT_EXEC, PROT_READ, PROT_WRITE, SIG_DFL, SIGCONT, SIGTERM, WCONTINUED, WNOHANG, WUNTRACED, wifcontinued, wifstopped}; use syscall::validate::{validate_slice, validate_slice_mut}; @@ -186,22 +186,28 @@ pub fn clone(flags: usize, stack_base: usize) -> Result { } } - if let Some(ref stack) = context.stack { - let mut new_stack = context::memory::Memory::new( - VirtualAddress::new(::USER_TMP_STACK_OFFSET), - stack.size(), - EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE, - false - ); + if let Some(ref stack_shared) = context.stack { + if flags & CLONE_STACK == CLONE_STACK { + stack_option = Some(stack_shared.clone()); + } else { + stack_shared.with(|stack| { + let mut new_stack = context::memory::Memory::new( + VirtualAddress::new(::USER_TMP_STACK_OFFSET), + stack.size(), + EntryFlags::PRESENT | EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE, + false + ); - unsafe { - intrinsics::copy(stack.start_address().get() as *const u8, - new_stack.start_address().get() as *mut u8, - stack.size()); + unsafe { + intrinsics::copy(stack.start_address().get() as *const u8, + new_stack.start_address().get() as *mut u8, + stack.size()); + } + + new_stack.remap(stack.flags()); + stack_option = Some(new_stack.to_shared()); + }); } - - new_stack.remap(stack.flags()); - stack_option = Some(new_stack); } if let Some(ref sigstack) = context.sigstack { @@ -457,9 +463,19 @@ pub fn clone(flags: usize, stack_base: usize) -> Result { } // Setup user stack - if let Some(mut stack) = stack_option { - stack.move_to(VirtualAddress::new(::USER_STACK_OFFSET), &mut new_table, &mut temporary_page); - context.stack = Some(stack); + if let Some(stack_shared) = stack_option { + if flags & CLONE_STACK == CLONE_STACK { + let frame = active_table.p4()[::USER_STACK_PML4].pointed_frame().expect("user stack not mapped"); + let flags = active_table.p4()[::USER_STACK_PML4].flags(); + active_table.with(&mut new_table, &mut temporary_page, |mapper| { + mapper.p4_mut()[::USER_STACK_PML4].set(frame, flags); + }); + } else { + stack_shared.with(|stack| { + stack.move_to(VirtualAddress::new(::USER_STACK_OFFSET), &mut new_table, &mut temporary_page); + }); + } + context.stack = Some(stack_shared); } // Setup user sigstack @@ -652,7 +668,7 @@ fn fexec_noreturn( ::USER_STACK_SIZE, EntryFlags::NO_EXECUTE | EntryFlags::WRITABLE | EntryFlags::USER_ACCESSIBLE, true - )); + ).to_shared()); // Map stack context.sigstack = Some(context::memory::Memory::new( diff --git a/syscall b/syscall index 54839d4..11fb32a 160000 --- a/syscall +++ b/syscall @@ -1 +1 @@ -Subproject commit 54839d42f495e339062b1d3480415544033d0c0c +Subproject commit 11fb32afb0371789be1849e504d3421b34ef1c01