diff options
| author | Marc Zyngier <maz@kernel.org> | 2024-10-02 21:49:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-22 15:56:51 +0200 |
| commit | 64b12b061c5488e2d69e67c4eaae5da64fd30bfe (patch) | |
| tree | 3158fb86239e28b61a5acc0c827eade0917df124 /net/ipv4/tcp_output.c | |
| parent | 0a4d4dbef622ac8796a6665e0080da2685f9220a (diff) | |
irqchip/gic-v4: Don't allow a VMOVP on a dying VPE
commit 1442ee0011983f0c5c4b92380e6853afb513841a upstream.
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/tcp_output.c')
0 files changed, 0 insertions, 0 deletions