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| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2017-05-03 16:37:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-14 13:16:27 +0200 |
| commit | 4eaef365181564203f4f9fb8fb576c89481cca12 (patch) | |
| tree | f66f3e9e2363a19438fe9e9ea01eaa514e008eee /arch/arm64/include | |
| parent | bc5f31d34eab7ed1d383c27cd867ed69b9b23940 (diff) | |
| download | linux-4eaef365181564203f4f9fb8fb576c89481cca12.tar.gz linux-4eaef365181564203f4f9fb8fb576c89481cca12.tar.bz2 linux-4eaef365181564203f4f9fb8fb576c89481cca12.zip | |
arm64: hw_breakpoint: fix watchpoint matching for tagged pointers
commit 7dcd9dd8cebe9fa626af7e2358d03a37041a70fb upstream.
This backport has a few small differences from the upstream commit:
- The address tag is removed in watchpoint_handler() instead of
get_distance_from_watchpoint(), because 4.4 does not have commit
fdfeff0f9e3d ("arm64: hw_breakpoint: Handle inexact watchpoint
addresses").
- A macro is backported (untagged_addr), as it is not present in 4.4.
Original patch description:
When we take a watchpoint exception, the address that triggered the
watchpoint is found in FAR_EL1. We compare it to the address of each
configured watchpoint to see which one was hit.
The configured watchpoint addresses are untagged, while the address in
FAR_EL1 will have an address tag if the data access was done using a
tagged address. The tag needs to be removed to compare the address to
the watchpoints.
Currently we don't remove it, and as a result can report the wrong
watchpoint as being hit (specifically, always either the highest TTBR0
watchpoint or lowest TTBR1 watchpoint). This patch removes the tag.
Fixes: d50240a5f6ce ("arm64: mm: permit use of tagged pointers at EL0")
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index d9ca1f2c0ea8..829fa6d3e561 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -21,6 +21,7 @@ /* * User space memory access functions */ +#include <linux/bitops.h> #include <linux/string.h> #include <linux/thread_info.h> @@ -103,6 +104,13 @@ static inline void set_fs(mm_segment_t fs) flag; \ }) +/* + * When dealing with data aborts, watchpoints, or instruction traps we may end + * up with a tagged userland pointer. Clear the tag to get a sane pointer to + * pass on to access_ok(), for instance. + */ +#define untagged_addr(addr) sign_extend64(addr, 55) + #define access_ok(type, addr, size) __range_ok(addr, size) #define user_addr_max get_fs |