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| author | James Hogan | 2015-08-05 17:41:39 +0200 |
|---|---|---|
| committer | Ralf Baechle | 2015-12-22 11:58:43 +0100 |
| commit | d6a428fb583738ad685c91a684748cdee7b2a05f (patch) | |
| tree | a0c987da5c8d66400b4cb40628921a775bc99ae8 /arch/mips/kernel/mips_ksyms.c | |
| parent | MIPS: uaccess: Take EVA into account in __copy_from_user() (diff) | |
| download | kernel-qcow2-linux-d6a428fb583738ad685c91a684748cdee7b2a05f.tar.gz kernel-qcow2-linux-d6a428fb583738ad685c91a684748cdee7b2a05f.tar.xz kernel-qcow2-linux-d6a428fb583738ad685c91a684748cdee7b2a05f.zip | |
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>
Diffstat (limited to 'arch/mips/kernel/mips_ksyms.c')
| -rw-r--r-- | arch/mips/kernel/mips_ksyms.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c index 291af0b5c482..e2b6ab74643d 100644 --- a/arch/mips/kernel/mips_ksyms.c +++ b/arch/mips/kernel/mips_ksyms.c @@ -17,6 +17,7 @@ #include <asm/fpu.h> #include <asm/msa.h> +extern void *__bzero_kernel(void *__s, size_t __count); extern void *__bzero(void *__s, size_t __count); extern long __strncpy_from_kernel_nocheck_asm(char *__to, const char *__from, long __len); @@ -64,6 +65,7 @@ EXPORT_SYMBOL(__copy_from_user_eva); EXPORT_SYMBOL(__copy_in_user_eva); EXPORT_SYMBOL(__copy_to_user_eva); EXPORT_SYMBOL(__copy_user_inatomic_eva); +EXPORT_SYMBOL(__bzero_kernel); #endif EXPORT_SYMBOL(__bzero); EXPORT_SYMBOL(__strncpy_from_kernel_nocheck_asm); |