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| author | Mark Rutland <mark.rutland@arm.com> | 2017-10-30 22:23:19 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-10-31 10:49:33 +0100 |
| commit | c80ed088a519da53f27b798a69748eaabc66aadf (patch) | |
| tree | c46b7d933904bf8dc37f1f2f05520ff54922c28c | |
| parent | arm64: prevent regressions in compressed kernel image size when upgrading to ... (diff) | |
| download | linux-c80ed088a519da53f27b798a69748eaabc66aadf.tar.xz linux-c80ed088a519da53f27b798a69748eaabc66aadf.zip | |
arm64: vdso: fix clock_getres for 4GiB-aligned res
The vdso tries to check for a NULL res pointer in __kernel_clock_getres,
but only checks the lower 32 bits as is uses CBZ on the W register the
res pointer is held in.
Thus, if the res pointer happened to be aligned to a 4GiB boundary, we'd
spuriously skip storing the timespec to it, while returning a zero error code
to the caller.
Prevent this by checking the whole pointer, using CBZ on the X register
the res pointer is held in.
Fixes: 9031fefde6f2ac1d ("arm64: VDSO support")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Andrew Pinski <apinski@cavium.com>
Reported-by: Mark Salyzyn <salyzyn@android.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/kernel/vdso/gettimeofday.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/vdso/gettimeofday.S b/arch/arm64/kernel/vdso/gettimeofday.S index 76320e920965..c39872a7b03c 100644 --- a/arch/arm64/kernel/vdso/gettimeofday.S +++ b/arch/arm64/kernel/vdso/gettimeofday.S @@ -309,7 +309,7 @@ ENTRY(__kernel_clock_getres) b.ne 4f ldr x2, 6f 2: - cbz w1, 3f + cbz x1, 3f stp xzr, x2, [x1] 3: /* res == NULL. */ |