Hello:
This patch was applied to riscv/linux.git (fixes) by Palmer Dabbelt palmer@rivosinc.com:
On Thu, 27 Jun 2024 22:23:39 +0800 you wrote:
Otherwise when the tracer changes syscall number to -1, the kernel fails to initialize a0 with -ENOSYS and subsequently fails to return the error code of the failed syscall to userspace. For example, it will break strace syscall tampering.
Fixes: 52449c17bdd1 ("riscv: entry: set a0 = -ENOSYS only when syscall != -1") Reported-by: "Dmitry V. Levin" ldv@strace.io Reviewed-by: Björn Töpel bjorn@rivosinc.com Cc: stable@vger.kernel.org Signed-off-by: Celeste Liu CoelacanthusHex@gmail.com
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Here is the summary with links: - [v2] riscv: entry: always initialize regs->a0 to -ENOSYS https://git.kernel.org/riscv/c/61119394631f
You are awesome, thank you!