Christophe Leroy 8524e2e764 powerpc/uaccess: Perform barrier_nospec() in KUAP allowance helpers ... barrier_nospec() in uaccess helpers is there to protect against speculative accesses around access_ok(). When using user_access_begin() sequences together with unsafe_get_user() like macros, barrier_nospec() is called for every single read although we know the access_ok() is done onece. Since all user accesses must be granted by a call to either allow_read_from_user() or allow_read_write_user() which will always happen after the access_ok() check, move the barrier_nospec() there. Reported-by: Christopher M. Riedl <cmr@codefail.de> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c72f014730823b413528e90ab6c4d3bcb79f8497.1612692067.git.christophe.leroy@csgroup.eu		2021-02-09 01:10:15 +11:00
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asm	powerpc/uaccess: Perform barrier_nospec() in KUAP allowance helpers	2021-02-09 01:10:15 +11:00
uapi/asm	powerpc/perf: Expose Performance Monitor Counter SPR's as part of extended regs	2021-02-09 01:09:44 +11:00