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MIPS: uaccess: Take EVA into account in [__]clear_user
__clear_user() (and clear_user() which uses it), always access the user mode address space, which results in EVA store instructions when EVA is enabled even if the current user address limit is KERNEL_DS. Fix this by adding a new symbol __bzero_kernel for the normal kernel address space bzero in EVA mode, and call that from __clear_user() if eva_kernel_access(). Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/10844/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -1235,6 +1235,17 @@ __clear_user(void __user *addr, __kernel_size_t size)
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{
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__kernel_size_t res;
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if (eva_kernel_access()) {
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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"move\t$5, $0\n\t"
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"move\t$6, %2\n\t"
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__MODULE_JAL(__bzero_kernel)
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"move\t%0, $6"
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: "=r" (res)
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: "r" (addr), "r" (size)
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: "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
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} else {
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might_fault();
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__asm__ __volatile__(
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"move\t$4, %1\n\t"
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@ -1245,6 +1256,7 @@ __clear_user(void __user *addr, __kernel_size_t size)
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: "=r" (res)
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: "r" (addr), "r" (size)
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: "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
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}
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return res;
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}
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@ -17,6 +17,7 @@
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#include <asm/fpu.h>
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#include <asm/msa.h>
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extern void *__bzero_kernel(void *__s, size_t __count);
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extern void *__bzero(void *__s, size_t __count);
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extern long __strncpy_from_kernel_nocheck_asm(char *__to,
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const char *__from, long __len);
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@ -64,6 +65,7 @@ EXPORT_SYMBOL(__copy_from_user_eva);
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EXPORT_SYMBOL(__copy_in_user_eva);
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EXPORT_SYMBOL(__copy_to_user_eva);
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EXPORT_SYMBOL(__copy_user_inatomic_eva);
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EXPORT_SYMBOL(__bzero_kernel);
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#endif
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EXPORT_SYMBOL(__bzero);
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EXPORT_SYMBOL(__strncpy_from_kernel_nocheck_asm);
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@ -283,6 +283,8 @@ LEAF(memset)
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1:
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#ifndef CONFIG_EVA
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FEXPORT(__bzero)
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#else
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FEXPORT(__bzero_kernel)
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#endif
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__BUILD_BZERO LEGACY_MODE
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