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Message-Id: <20230131063928.388035-2-ajd@linux.ibm.com>
Date: Tue, 31 Jan 2023 17:39:04 +1100
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org, linux-integrity@...r.kernel.org
Cc: ruscur@...sell.cc, bgray@...ux.ibm.com, nayna@...ux.ibm.com,
gcwilson@...ux.ibm.com, gjoyce@...ux.ibm.com, brking@...ux.ibm.com,
stefanb@...ux.ibm.com, sudhakar@...ux.ibm.com,
erichte@...ux.ibm.com, gregkh@...uxfoundation.org,
linux-kernel@...r.kernel.org, zohar@...ux.ibm.com, joel@....id.au,
npiggin@...il.com
Subject: [PATCH v5 01/25] powerpc/pseries: Fix handling of PLPKS object flushing timeout
plpks_confirm_object_flushed() uses the H_PKS_CONFIRM_OBJECT_FLUSHED hcall
to check whether changes to an object in the Platform KeyStore have been
flushed to non-volatile storage.
The hcall returns two output values, the return code and the flush status.
plpks_confirm_object_flushed() polls the hcall until either the flush
status has updated, the return code is an error, or a timeout has been
exceeded.
While we're still polling, the hcall is returning H_SUCCESS (0) as the
return code. In the timeout case, this means that upon exiting the polling
loop, rc is 0, and therefore 0 is returned to the user.
Handle the timeout case separately and return ETIMEDOUT if triggered.
Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore")
Reported-by: Benjamin Gray <bgray@...ux.ibm.com>
Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
Tested-by: Russell Currey <ruscur@...sell.cc>
Reviewed-by: Russell Currey <ruscur@...sell.cc>
Signed-off-by: Russell Currey <ruscur@...sell.cc>
---
v3: Merge plpks fixes and signed update series with secvar series
Neaten how we return at the end of the function (ruscur)
v4: Move up in series (npiggin)
---
arch/powerpc/platforms/pseries/plpks.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c
index 4edd1585e245..9e85b6d85b0b 100644
--- a/arch/powerpc/platforms/pseries/plpks.c
+++ b/arch/powerpc/platforms/pseries/plpks.c
@@ -248,6 +248,7 @@ static int plpks_confirm_object_flushed(struct label *label,
struct plpks_auth *auth)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
+ bool timed_out = true;
u64 timeout = 0;
u8 status;
int rc;
@@ -259,22 +260,26 @@ static int plpks_confirm_object_flushed(struct label *label,
status = retbuf[0];
if (rc) {
+ timed_out = false;
if (rc == H_NOT_FOUND && status == 1)
rc = 0;
break;
}
- if (!rc && status == 1)
+ if (!rc && status == 1) {
+ timed_out = false;
break;
+ }
usleep_range(PKS_FLUSH_SLEEP,
PKS_FLUSH_SLEEP + PKS_FLUSH_SLEEP_RANGE);
timeout = timeout + PKS_FLUSH_SLEEP;
} while (timeout < PKS_FLUSH_MAX_TIMEOUT);
- rc = pseries_status_to_err(rc);
+ if (timed_out)
+ return -ETIMEDOUT;
- return rc;
+ return pseries_status_to_err(rc);
}
int plpks_write_var(struct plpks_var var)
--
2.39.1
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