From f74dcbfd27c647af9b7b83f3711c63712c677abd Mon Sep 17 00:00:00 2001 From: Andrew Donnellan Date: Fri, 10 Feb 2023 19:03:36 +1100 Subject: [PATCH] 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 Signed-off-by: Andrew Donnellan Tested-by: Russell Currey Reviewed-by: Russell Currey Signed-off-by: Russell Currey Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230210080401.345462-2-ajd@linux.ibm.com --- 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 4edd158..9e85b6d 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) -- 2.7.4