Fix arm64 uprobes endianness mismatch in instruction emulation

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue Description: The arm64 uprobes code contains an error when running on big-endian kernels, as it fails to convert instruction encodings in memory (which are always little-endian) to the kernel’s native endianness before analyzing and emulating instructions. - Impact: - The kernel may incorrectly reject probing on instructions that are safe to probe. - The kernel may incorrectly allow breakpoints on instructions that are unsafe to probe. - The kernel may incorrectly emulate instructions in the wrong order, leading to erroneous byte-swapped encodings. 2. Solution: - Fix Method: Resolve the endianness mismatch by changing the fields to , and adding appropriate conversions before consuming instruction encodings. - Code Example: 3. Test Results: - Test Code: 4. Results After Fix: - Before Fix: The ADRP instruction was not recognized and was mistakenly considered breakpointable, leading to corrupted results. - After Fix: The ADRP instruction is correctly recognized and emulated, yielding correct results. 5. Patch Information: - Patch Description: Fixes commit 9842ceae9fa8 ("arm64: add uprobes support"). - Author: Mark Rutland - CC: stable@vger.kernel.org, Mark Rutland , Catalin Marines , Will Deacon , Sasha Levin This information provides a detailed overview of the vulnerability’s background, impact, fix, test results, and patch details.

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Fix arm64 uprobes endianness mismatch in instruction emulation