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It turns out that the current Linux implementation of KCOV does not
properly handle multiple mmap invocations on the same instance. The
first one succeedes, but the subsequent ones do not actually mmap
anything, yet returning no error at all.
The ability to mmap that memory multiple times allows us to increase
syz-executor performance and it would be a pity to completely lose it
(especially given that mmapping kcov works fine on *BSD).
In some time a patch will be prepared, but still we will have to support
both versions at the same time - the buggy one and the correct one.
Detect whether the bug is present by writing a value at the pointer
returned by mmap. If it is present, disable dynamic kcov mmapping and
pre-mmap 5 instances in the main() function - it should be enough for
all reasonable uses. Otherwise, pre-mmap 3 and let syz-executor mmap
them as needed.
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syscall.Utsname is hard to use portably, see:
https://github.com/google/syzkaller/pull/2418#issuecomment-774858512
Switch to unix.Utsname which does not have this problem.
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kcov_remote_arg has padding on 32-bit arches.
Account for it, otherwise kernel reads uninit garbage
after the struct and the ioctl fails with EINVAL.
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WiFi setup fails on 4.4 kernel with:
2020/11/28 12:22:49 BUG: program execution failed: executor 0: exit status 67
initialize_wifi_devices: failed to create device #0 (errno 19)
There is at least HWSIM_ATTR_PERM_ADDR not support, but maybe something else.
The setup seems to work at least on 4.17 where HWSIM_ATTR_PERM_ADDR was added.
So require at least 4.17 for WiFi testing.
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Two virtual wireless devices are instantiated during network devices
initialization.
A new flag (-wifi) is added that controls whether these virtual wifi
devices are instantiated and configured during proc initialization.
Also, two new pseudo syscalls are added:
1. syz_80211_inject_frame(mac_addr, packet, packet_len) -- injects an
arbitrary packet into the wireless stack. It is injected as if it
originated from the device identitied by mac_addr.
2. syz_80211_join_ibss(interface_name, ssid, ssid_len, mode) --
puts a specific network interface into IBSS state and joins an IBSS
network.
Arguments of syz_80211_join_ibss:
1) interface_name -- null-terminated string that identifies
a wireless interface
2) ssid, ssid_len -- SSID of an IBSS network to join to
3) mode -- mode of syz_80211_join_ibss operation (see below)
Modes of operation:
JOIN_IBSS_NO_SCAN (0x0) -- channel scan is not performed and
syz_80211_join_ibss waits until the interface reaches IF_OPER_UP.
JOIN_IBSS_BG_SCAN (0x1) -- channel scan is performed (takes ~ 9
seconds), syz_80211_join_ibss does not await IF_OPER_UP.
JOIN_IBSS_BG_NO_SCAN (0x2) -- channel scan is not performed,
syz_80211_join_ibss does not await IF_OPER_UP.
Local testing ensured that these syscalls are indeed able to set up an
operating network and inject packets into mac80211.
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* all: initialize vhci in linux
* executor/common_linux.h: improve vhci initialization
* pkg/repro/repro.go: add missing vhci options
* executor/common_linux.h: fix type and add missing header
* executor, pkg: do it like NetInjection
* pkg/csource/csource.go: do not emit syz_emit_vhci if vhci is not enabled
* executor/common_linux.h: fix format string
* executor/common_linux.h: initialize with memset
For som reason {0} gets complains about missing braces...
* executor/common_linux.h: simplify vhci init
* executor/common_linux.h: try to bring all available hci devices up
* executor/common_linux.h: find which hci device has been registered
* executor/common_linux.h: use HCI_VENDOR_PKT response to retrieve device id
* sys/linux/dev_vhci.txt: fix structs of inquiry and report packets
* executor/common_linux.h: remove unnecessary return statement and check vendor_pkt read size
* executor/common_linux.h: remove unnecessary return statement and check vendor_pkt read size
* sys/linux/dev_vhci.txt: pack extended_inquiry_info_t
* sys/linux/l2cap.txt: add l2cap_conf_opt struct
* executor/common_linux.h: just fill bd addr will 0xaa
* executor/common_linux.h: just fill bd addr will 0xaa
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The feature gets enabled when /dev/raw-gadget is present and accessible.
With this feature enabled, executor will do chmod 0666 /dev/raw-gadget on
startup, which makes it possible to do USB fuzzing in setuid and namespace
sandboxes. There should be no backwards compatibility issues with syz
reproducers that don't explicitly enable this feature, as they currently only
work in none sandbox.
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Rename some features in preparation for subsequent changes
which will align names across the code base.
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In preparation for future changes.
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pkg/host does 2 things: detects supported syscalls and supported features.
There is enough code for each for a separate file.
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