From: Mark Brown broonie@kernel.org
mainline inclusion from mainline-v5.17-rc1 commit aed34d9e52b80b4e7485119272c77c5553a21499 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8E73O CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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As suggested by Luis for the SME version of this explicitly say that the vector length should be extracted from the return value of a set vector length prctl() with a bitwise and rather than just any old and.
Suggested-by: Luis Machado Luis.Machado@arm.com Signed-off-by: Mark Brown broonie@kernel.org Link: https://lore.kernel.org/r/20211210184133.320748-4-broonie@kernel.org Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Wang ShaoBo bobo.shaobowang@huawei.com --- Documentation/arm64/sve.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/arm64/sve.rst b/Documentation/arm64/sve.rst index 03137154299e5..9d9a4de5bc34a 100644 --- a/Documentation/arm64/sve.rst +++ b/Documentation/arm64/sve.rst @@ -255,7 +255,7 @@ prctl(PR_SVE_GET_VL) vector length change (which would only normally be the case between a fork() or vfork() and the corresponding execve() in typical use).
- To extract the vector length from the result, and it with + To extract the vector length from the result, bitwise and it with PR_SVE_VL_LEN_MASK.
Return value: a nonnegative value on success, or a negative value on error: