Permalink
Comparing changes
Choose two branches to see what’s changed or to start a new pull request.
If you need to, you can also or
learn more about diff comparisons.
Open a pull request
Create a new pull request by comparing changes across two branches. If you need to, you can also .
Learn more about diff comparisons here.
...
- 1 commit
- 3 files changed
- 2 contributors
Commits on Aug 17, 2023
-
feat: Binary syscall bypass through VDSO
Glibc utilizes the `__syscall` macro to perform system calls. Syscalls with varying numbers of parameters are further dispatched to implementations like `__syscall1`, `__syscall2`, and so on. These implementations employ the `syscall` instruction for binary syscalls. To bypass binary syscalls, we extract the `__kernel_vsyscall` symbol from VDSO and replace the `syscall` instruction with a direct call to the kernel functions. Note that during the initialization process of glibc, certain syscalls will be used. However, at this point, the `__kernel_vsyscall` symbol has not yet been extracted. It's also possible that the kernel could not provide this interface. In such cases, the `__kernel_vsyscall` pointer remains at its default value of `NULL`, and glibc will continue to use binary syscalls. Since we do not support syscalls with cancellation points (syscall_cp), we merely map them to regular syscalls. Signed-off-by: Tianyi Liu <i.pear@outlook.com> Signed-off-by: Simon Kuenzer <simon@unikraft.io> Co-authored-by: Simon Kuenzer <simon@unikraft.io> Reviewed-by: Ioan-Teodor Teugea <ioan_teodor.teugea@stud.acs.upb.ro> Reviewed-by: Andra Paraschiv <andra@unikraft.org> Approved-by: Simon Kuenzer <simon@unikraft.io> GitHub-Closes: #1
Loading
This comparison is taking too long to generate.
Unfortunately it looks like we can’t render this comparison for you right now. It might be too big, or there might be something weird with your repository.
You can try running this command locally to see the comparison on your machine:
git diff master...UNIKRAFT-glibc-2.37