nsfs: tighten permission checks for ns iteration ioctls

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[ Upstream commit e6b899f080 ]

Even privileged services should not necessarily be able to see other
privileged service's namespaces so they can't leak information to each
other. Use may_see_all_namespaces() helper that centralizes this policy
until the nstree adapts.

Link: https://patch.msgid.link/20260226-work-visibility-fixes-v1-1-d2c2853313bd@kernel.org
Fixes: a1d220d9da ("nsfs: iterate through mount namespaces")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Cc: stable@kernel.org # v6.12+
Signed-off-by: Christian Brauner <brauner@kernel.org>
[ context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Christian Brauner 2026-03-17 16:02:24 -04:00 • committed by Greg Kroah-Hartman

parent 05edc78eb4

commit 2f3dea284c

3 changed files with 21 additions and 0 deletions

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13

fs/nsfs.c

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2

include/linux/ns_common.h

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6

kernel/nscommon.c

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