- 27 12月, 2016 1 次提交
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由 Al Viro 提交于
Split asm-only parts of arm64 uaccess.h into a new header and use that from *.S. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 25 12月, 2016 1 次提交
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由 Linus Torvalds 提交于
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 22 11月, 2016 1 次提交
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由 Catalin Marinas 提交于
This patch moves the directly coded alternatives for turning PAN on/off into separate uaccess_{enable,disable} macros or functions. The asm macros take a few arguments which will be used in subsequent patches. Note that any (unlikely) access that the compiler might generate between uaccess_enable() and uaccess_disable(), other than those explicitly specified by the user access code, will not be protected by PAN. Cc: Will Deacon <will.deacon@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Kees Cook <keescook@chromium.org> Reviewed-by: NMark Rutland <mark.rutland@arm.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 19 2月, 2016 2 次提交
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由 James Morse 提交于
If a CPU supports both Privileged Access Never (PAN) and User Access Override (UAO), we don't need to disable/re-enable PAN round all copy_to_user() like calls. UAO alternatives cause these calls to use the 'unprivileged' load/store instructions, which are overridden to be the privileged kind when fs==KERNEL_DS. This patch changes the copy_to_user() calls to have their PAN toggling depend on a new composite 'feature' ARM64_ALT_PAN_NOT_UAO. If both features are detected, PAN will be enabled, but the copy_to_user() alternatives will not be applied. This means PAN will be enabled all the time for these functions. If only PAN is detected, the toggling will be enabled as normal. This will save the time taken to disable/re-enable PAN, and allow us to catch copy_to_user() accesses that occur with fs==KERNEL_DS. Futex and swp-emulation code continue to hang their PAN toggling code on ARM64_HAS_PAN. Signed-off-by: NJames Morse <james.morse@arm.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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由 James Morse 提交于
'User Access Override' is a new ARMv8.2 feature which allows the unprivileged load and store instructions to be overridden to behave in the normal way. This patch converts {get,put}_user() and friends to use ldtr*/sttr* instructions - so that they can only access EL0 memory, then enables UAO when fs==KERNEL_DS so that these functions can access kernel memory. This allows user space's read/write permissions to be checked against the page tables, instead of testing addr<USER_DS, then using the kernel's read/write permissions. Signed-off-by: NJames Morse <james.morse@arm.com> [catalin.marinas@arm.com: move uao_thread_switch() above dsb()] Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 07 10月, 2015 1 次提交
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由 Feng Kan 提交于
This patch optimize copy_to-from-in_user for arm 64bit architecture. The copy template is used as template file for all the copy*.S files. Minor change was made to it to accommodate the copy to/from/in user files. Signed-off-by: NFeng Kan <fkan@apm.com> Signed-off-by: NBalamurugan Shanmugam <bshanmugam@apm.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 27 7月, 2015 2 次提交
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由 James Morse 提交于
'Privileged Access Never' is a new arm8.1 feature which prevents privileged code from accessing any virtual address where read or write access is also permitted at EL0. This patch enables the PAN feature on all CPUs, and modifies {get,put}_user helpers temporarily to permit access. This will catch kernel bugs where user memory is accessed directly. 'Unprivileged loads and stores' using ldtrb et al are unaffected by PAN. Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NJames Morse <james.morse@arm.com> [will: use ALTERNATIVE in asm and tidy up pan_enable check] Signed-off-by: NWill Deacon <will.deacon@arm.com>
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由 Will Deacon 提交于
The AArch64 instruction set contains load/store pair memory accessors, so use these in our copy_*_user routines to transfer 16 bytes per iteration. Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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- 17 9月, 2012 1 次提交
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由 Catalin Marinas 提交于
This patch add support for various user access functions. These functions use the standard LDR/STR instructions and not the LDRT/STRT variants in order to allow kernel addresses (after set_fs(KERNEL_DS)). Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NTony Lindgren <tony@atomide.com> Acked-by: NNicolas Pitre <nico@linaro.org> Acked-by: NOlof Johansson <olof@lixom.net> Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: NArnd Bergmann <arnd@arndb.de>
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