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target/arm: PSTATE.PAN should not clear exec bits 

Our implementation of the PSTATE.PAN bit incorrectly cleared all
access permission bits for privileged access to memory which is
user-accessible.  It should only affect the privileged read and write
permissions; execute permission is dealt with via XN/PXN instead.

Fixes: 81636b70c2
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200330170651.20901-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-03-30 18:06:51 +01:00
parent 8a2b76ffc9
commit f4e1dbc578
1 changed files with 4 additions and 2 deletions
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6
target/arm/helper.c
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@ -10025,9 +10025,11 @@ static int get_S1prot(CPUARMState *env, ARMMMUIdx mmu_idx, bool is_aa64,
prot_rw = user_rw;
} else {
if (user_rw && regime_is_pan(env, mmu_idx)) {
return 0;
/* PAN forbids data accesses but doesn't affect insn fetch */
prot_rw = 0;
} else {
prot_rw = simple_ap_to_rw_prot_is_user(ap, false);
}
prot_rw = simple_ap_to_rw_prot_is_user(ap, false);
}
if (ns && arm_is_secure(env) && (env->cp15.scr_el3 & SCR_SIF)) {