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| author | Marc Zyngier <maz@kernel.org> | 2024-10-02 21:49:59 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-10-08 17:44:27 +0200 |
| commit | 1442ee0011983f0c5c4b92380e6853afb513841a (patch) | |
| tree | 78f047d12e66129a3021e639081e7974e020fe22 /rust/helpers/task.c | |
| parent | 6eabf656048d904d961584de2e1d45bc0854f9fb (diff) | |
irqchip/gic-v4: Don't allow a VMOVP on a dying VPE
Kunkun Jiang reported that there is a small window of opportunity for
userspace to force a change of affinity for a VPE while the VPE has already
been unmapped, but the corresponding doorbell interrupt still visible in
/proc/irq/.
Plug the race by checking the value of vmapp_count, which tracks whether
the VPE is mapped ot not, and returning an error in this case.
This involves making vmapp_count common to both GICv4.1 and its v4.0
ancestor.
Fixes: 64edfaa9a234 ("irqchip/gic-v4.1: Implement the v4.1 flavour of VMAPP")
Reported-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/c182ece6-2ba0-ce4f-3404-dba7a3ab6c52@huawei.com
Link: https://lore.kernel.org/all/20241002204959.2051709-1-maz@kernel.org
Diffstat (limited to 'rust/helpers/task.c')
0 files changed, 0 insertions, 0 deletions