x86/mm/pkeys: Fix fill_sig_info_pkey

SEGV_PKUERR is a signal specific si_code which happens to have the same
numeric value as several others: BUS_MCEERR_AR, ILL_ILLTRP, FPE_FLTOVF,
TRAP_HWBKPT, CLD_TRAPPED, POLL_ERR, SEGV_THREAD_ID, as such it is not safe
to just test the si_code the signal number must also be tested to prevent a
false positive in fill_sig_info_pkey.

This error was by inspection, and BUS_MCEERR_AR appears to be a real
candidate for confusion.  So pass in si_signo and check for SIG_SEGV to
verify that it is actually a SEGV_PKUERR

Fixes: 019132ff3daf ("x86/mm/pkeys: Fill in pkey field in siginfo")
Signed-off-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: Dave Hansen <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Al Viro <[email protected]>
cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

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