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Mukesh Kumar Chaurasiya (IBM)
263e5159e0
Commitd7a6797e0b("powerpc: add exit_flags field in pt_regs") added the exit_flags field to struct pt_regs to pass internal exit control flags (e.g. _TIF_RESTOREALL) from syscall_exit_prepare() to the low-level assembly exit path. However, the field was placed in a way that was visible to userspace tools such as strace via PTRACE_GETREGS, or caused a struct layout or size regression observable through ptrace. The field is purely kernel-internal and must not be exposed beyond the user_pt_regs boundary. Move exit_flags into struct thread_info where it is only accessible to the kernel, and keep it out of the ptrace-visible register window entirely. Fixes:d7a6797e0b("powerpc: add exit_flags field in pt_regs") Reported-by: Dmitry V. Levin <[email protected]> Closes: https://lore.kernel.org/all/[email protected]/ Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <[email protected]> Signed-off-by: Madhavan Srinivasan <[email protected]> Link: https://patch.msgid.link/[email protected]