diff options
| author | David Collins | 2022-09-29 17:50:17 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2022-09-30 14:33:23 +0200 |
| commit | c8669773c74e26ceb2412215a2db40399e3fe119 (patch) | |
| tree | a3f52f7d001fa530e0814aaa706b0f9baa65f04f /drivers/spmi | |
| parent | 1f1693118c2476cb1666ad357edcf3cf48bf9b16 (diff) | |
spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes
The system crashes due to an access permission violation when
writing to a PMIC peripheral which is not owned by the current
ee. Add a check for PMIC arbiter version 5 for such invalid
write requests and return an error instead of crashing the
system.
Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
Link: https://lore.kernel.org/r/1655004286-11493-8-git-send-email-quic_fenglinw@quicinc.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220930005019.2663064-9-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spmi')
| -rw-r--r-- | drivers/spmi/spmi-pmic-arb.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c index cf92abc51689..39f25bc26233 100644 --- a/drivers/spmi/spmi-pmic-arb.c +++ b/drivers/spmi/spmi-pmic-arb.c @@ -1133,6 +1133,11 @@ static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr, offset = 0x10000 * pmic_arb->ee + 0x80 * apid; break; case PMIC_ARB_CHANNEL_RW: + if (pmic_arb->apid_data[apid].write_ee != pmic_arb->ee) { + dev_err(&pmic_arb->spmic->dev, "disallowed SPMI write to sid=%u, addr=0x%04X\n", + sid, addr); + return -EPERM; + } offset = 0x10000 * apid; break; } |