Thomas Weißschuh linux@weissschuh.net writes:
sched_core_share_pid() copies the cookie to userspace with put_user(id, (u64 __user *)uaddr), expecting 64 bits of space. The "unsigned long" datatype that is documented in core-scheduling.rst however is only 32 bits large on 32 bit architectures.
Document "unsigned long long" as the correct data type that is always 64bits large.
This matches what the selftest cs_prctl_test.c has been doing all along.
Fixes: 0159bb020ca9 ("Documentation: Add usecases, design and interface for core scheduling") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/util-linux/df7a25a0-7923-4f8b-a527-5e6f0064074d@t-8c... Signed-off-by: Thomas Weißschuh linux@weissschuh.net
Documentation/admin-guide/hw-vuln/core-scheduling.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/hw-vuln/core-scheduling.rst b/Documentation/admin-guide/hw-vuln/core-scheduling.rst index cf1eeefdfc32..a92e10ec402e 100644 --- a/Documentation/admin-guide/hw-vuln/core-scheduling.rst +++ b/Documentation/admin-guide/hw-vuln/core-scheduling.rst @@ -67,8 +67,8 @@ arg4: will be performed for all tasks in the task group of ``pid``. arg5:
- userspace pointer to an unsigned long for storing the cookie returned by
- ``PR_SCHED_CORE_GET`` command. Should be 0 for all other commands.
- userspace pointer to an unsigned long long for storing the cookie returned
- by ``PR_SCHED_CORE_GET`` command. Should be 0 for all other commands.
Applied, thanks.
jon