qemu/hw/scsi
Eric Blake 262a69f428 osdep.h: Prohibit disabling assert() in supported builds
We already have several files that knowingly require assert()
to work, sometimes because refactoring the code for proper
error handling has not been tackled yet; there are probably
other files that have a similar situation but with no comments
documenting the same.  In fact, we have places in migration
that handle untrusted input with assertions, where disabling
the assertions risks a worse security hole than the current
behavior of losing the guest to SIGABRT when migration fails
because of the assertion.  Promote our current per-file
safety-valve to instead be project-wide, and expand it to also
cover glib's g_assert().

Note that we do NOT want to encourage 'assert(side-effects);'
(that is a bad practice that prevents copy-and-paste of code to
other projects that CAN disable assertions; plus it costs
unnecessary reviewer mental cycles to remember whether a project
special-cases the crippling of asserts); and we would LIKE to
fix migration to not rely on asserts (but that takes a big code
audit).  But in the meantime, we DO want to send a message
that anyone that disables assertions has to tweak code in order
to compile, making it obvious that they are taking on additional
risk that we are not going to support.  At the same time, leave
comments mentioning NDEBUG in files that we know still need to
be scrubbed, so there is at least something to grep for.

It would be possible to come up with some other mechanism for
doing runtime checking by default, but which does not abort
the program on failure, while leaving side effects in place
(unlike how crippling assert() avoids even the side effects),
perhaps under the name q_verify(); but it was not deemed worth
the effort (developers should not have to learn a replacement
when the standard C macro works just fine, and it would be a lot
of churn for little gain).  The patch specifically uses #error
rather than #warn so that a user is forced to tweak the header
to acknowledge the issue, even when not using a -Werror
compilation.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>

Message-Id: <20170911211320.25385-1-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-09-19 16:20:49 +02:00
..
esp-pci.c hw/scsi: Concentrate -drive if=scsi auto-create in one place 2017-02-21 13:17:45 +01:00
esp.c scsi/esp: Rename the ESP macro to ESP_STATE 2017-09-19 14:09:33 +02:00
lsi53c895a.c scsi/lsi53c895a: Remove unused lsi_mem_*() return value 2017-06-04 18:42:55 +03:00
Makefile.objs vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
megasas.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
mfi.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
mpi.h hw: Add support for LSI SAS1068 (mptsas) device 2016-02-09 15:45:26 +01:00
mptconfig.c scsi: mptconfig: fix misuse of MPTSAS_CONFIG_PACK 2016-09-13 19:08:46 +02:00
mptendian.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
mptsas.c osdep.h: Prohibit disabling assert() in supported builds 2017-09-19 16:20:49 +02:00
mptsas.h mptsas: really fix migration compatibility 2016-08-03 18:44:56 +02:00
scsi-bus.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
scsi-disk.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
scsi-generic.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
spapr_vscsi.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
srp.h spapr-vscsi: add task management 2013-09-12 08:46:21 +02:00
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
vhost-scsi-common.c vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
vhost-scsi.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vhost-user-scsi.c vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
viosrp.h hw: move private headers to hw/ subdirectories. 2013-04-08 18:13:16 +02:00
virtio-scsi-dataplane.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
virtio-scsi.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
vmw_pvscsi.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
vmw_pvscsi.h scsi: VMWare PVSCSI paravirtual device implementation 2013-04-19 10:44:17 +02:00