arm64/signal: Only read new data when parsing the SVE context
authorMark Brown <broonie@kernel.org>
Tue, 31 Jan 2023 22:20:43 +0000 (22:20 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Wed, 1 Feb 2023 17:56:47 +0000 (17:56 +0000)
commitf3ac48aa3a58b0d0b1104416a652dc7da9c03b4a
tree295df2546ae909b9a9ad117d02bb2969f7db834b
parentb57682b315588aab496439e317c0f433f28600ae
arm64/signal: Only read new data when parsing the SVE context

When we parse the SVE signal context we read the entire context from
userspace, including the generic signal context header which was already
read by parse_user_sigframe() and padding bytes that we ignore. Avoid the
possibility of relying on the second read of the data read twice by only
reading the data which we are actually going to use.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221212-arm64-signal-cleanup-v3-5-4545c94b20ff@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/kernel/signal.c