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libct/specconv: fix partial clear of atime mount flags

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When parsing mount options into recAttrSet and recAttrClr,
the code sets attr_clr to individual atime flags (e.g.
MOUNT_ATTR_NOATIME or MOUNT_ATTR_STRICTATIME) when clearing
atime attributes. However, this violates the kernel's
requirement documented in mount_setattr(2)[1]:

> Note that, since the access-time values are an enumeration
> rather than bit values, a caller wanting to transition to a
> different access-time setting cannot simply specify the
> access-time setting in attr_set, but must also include
> MOUNT_ATTR__ATIME in the attr_clr field.  The kernel will
> verify that MOUNT_ATTR__ATIME isn't partially set in
> attr_clr (i.e., either all bits in the MOUNT_ATTR__ATIME
> bit field are either set or clear), and that attr_set
> doesn't have any access-time bits set if MOUNT_ATTR__ATIME
> isn't set in attr_clr.

Passing only a single atime flag (e.g. MOUNT_ATTR_RELATIME) in
attr_clr causes mount_setattr() to fail with EINVAL.

This change ensures that whenever an atime mode is updated,
attr_clr includes MOUNT_ATTR__ATIME to properly reset the
entire access-time attribute field before applying the new mode.

[1] https://man7.org/linux/man-pages/man2/mount_setattr.2.html

Signed-off-by: lifubang <lifubang@acmcoder.com>
This commit is contained in:
lifubang
2026-02-03 03:44:54 +00:00
parent 92c80abae1
commit 5560d55bfd
2 changed files with 56 additions and 6 deletions
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tests/integration/mounts_recursive.bats
+51 -1
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@@ -23,7 +23,7 @@ function teardown_volume() {
function setup() {
setup_volume
setup_busybox
setup_debian
}
function teardown() {
@@ -76,3 +76,53 @@ function teardown() {
[ "$status" -eq 1 ]
[[ "${output}" == *"Read-only file system"* ]]
}
# https://github.com/opencontainers/runc/issues/5095
@test "runc run [ check rbind,r*atime mounts]" {
requires_kernel 5.12
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt1\", options: [\"rbind\",\"ratime\"]}]"
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt2\", options: [\"rbind\",\"rnoatime\"]}]"
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt3\", options: [\"rbind\",\"rstrictatime\"]}]"
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt4\", options: [\"rbind\",\"rnostrictatime\"]}]"
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt5\", options: [\"rbind\",\"rrelatime\"]}]"
update_config ".mounts += [{source: \"${TESTVOLUME}\" , destination: \"/mnt6\", options: [\"rbind\",\"rnorelatime\"]}]"
runc run -d --console-socket "$CONSOLE_SOCKET" test_rbind_ratime
[ "$status" -eq 0 ]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt1
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt1/subvol
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt2
[[ "${output}" == "rw,noatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt2/subvol
[[ "${output}" == "rw,noatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt3
[[ "${output}" == "rw,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt3/subvol
[[ "${output}" == "rw,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt4
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt4/subvol
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt5
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt5/subvol
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt6
[[ "${output}" == "rw,relatime,"* ]]
runc exec test_rbind_ratime findmnt --noheadings -o options /mnt6/subvol
[[ "${output}" == "rw,relatime,"* ]]
}