Dear Linux Stable Team,

I am writing to report an issue encountered while attempting to boot kernel version 5.4.274 with an egress XDP patch applied. The issue arises with the EFI loader signature, leading to subsequent kernel panic.

*Problem Description:*

When attempting to boot kernel version 5.4.274 with the egress XDP patch, I encountered the following sequence of events:

1. Initially, the system displays the message "Wrong EFI loader signature." 2. Following this message, the system proceeds to decompress the Linux kernel and performs ELF parsing and relocations successfully. 3. However, upon attempting to boot the kernel, a kernel panic occurs with the error message: "Kernel panic not syncing: UFS: Unable to mount root fs on unknown-block(0,0)."

*Error Messages*:(ScreenShots Attached)

Upon selecting the kernel version 5.4.274, the system displays the following error messages:

``` Wrong EFI loader signature.

early console in extract_kernel input_data: 0x00000000027493b1 input_len: 0x000000000086892c output: 0x0000000001000000 output_len: 0x0000000001f81298 kernel_total_size: 0x0000000001e2c000 needed_size: 0x0000000002000000 trampoline_32bit: 0x0000000000090000 booted via startup_32() Physical, KASLR using RDTSC. Virtual KASLR using RDTSC.. Decompressing Linux... Parsing ELF... Performing relocations... done. Booting the kernel. 8.0522441 RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable to RETBleed attacks, data leaks possible! 0.9972031 Kernel panic not syncing: UFS: Unable to mount root fs on unknown-block(0,0) CPU: 1 PID: 1 Command: swapper/0 Not tainted 5.4.274 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Call Trace: dump_stack+0x58/0x63 panic+0x188/0x2ce Mount_block_root+0x19b/0x23a prepare_namespace+0x136/0x16c kernel_init_freeable+0x207/0x210 rest_init+0x90/0x90 kernel_init+0x5/0xf6 ret_from_fork+0x35/0x48 Kernel Offset: 0x8488000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xfffffffffffffff) --- end Kernel panic not syncing: UFS: Unable to mount root fs on unknown-block(0,8) ```

*Additional Information*:

- The issue persists even after signing the kernel. - I am using Kali Linux in VMware, with the following system information: - Linux kali 6.6.15-amd64 #1 SMP PREEMPT_DYNAMIC Kali 6.6.15-2kali1 (2024-04-09) x86_64 GNU/Linux

*Steps Taken*:

1. Applied egress XDP patch to kernel version 5.4.274. 2. Attempted to boot the patched kernel. 3. Encountered the "Wrong EFI loader signature" message followed by kernel panic.

*Action Required*:

I kindly request assistance in resolving this issue or guidance on further troubleshooting steps.

Please let me know if any additional information is required.

Thank you for your attention to this matter.

Best regards,

Atishya Jain Project Associate Indian Institute of Technology Gandhinagar Palaj, Gandhinagar - 382055 - India. Email: atishya.jain@iitgn.ac.in LinkedIn: www.linkedin.com/in/atishya-jain-it

*Screenshots:*