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Andrii Nakryiko dfeb376dd4 bpf: Prevent mmap()'ing read-only maps as writable 
As discussed in [0], it's dangerous to allow mapping BPF map, that's meant to
be frozen and is read-only on BPF program side, because that allows user-space
to actually store a writable view to the page even after it is frozen. This is
exacerbated by BPF verifier making a strong assumption that contents of such
frozen map will remain unchanged. To prevent this, disallow mapping
BPF_F_RDONLY_PROG mmap()'able BPF maps as writable, ever.

  [0] https://lore.kernel.org/bpf/CAEf4BzYGWYhXdp6BJ7_=9OQPJxQpgug080MMjdSB72i9R+5c6g@mail.gmail.com/

Fixes: fc9702273e ("bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY")
Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/bpf/20200519053824.1089415-1-andriin@fb.com
2020-05-20 20:21:53 -07:00
..
android SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
arm64 .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
bpf bpf: Prevent mmap()'ing read-only maps as writable 2020-05-20 20:21:53 -07:00
breakpoints .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
capabilities .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
cgroup SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
clone3 SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
cpu-hotplug selftests: cpu-hotplug: fix case where CPUs offline > CPUs present 2019-01-25 14:57:45 -07:00
cpufreq
dmabuf-heaps kselftests: dmabuf-heaps: Fix confused return value on expected error testing 2020-05-08 09:40:58 -06:00
drivers SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
efivarfs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
exec .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
filesystems kselftests: introduce new epoll60 testcase for catching lost wakeups 2020-05-07 19:27:21 -07:00
firmware selftests: firmware: Add firmware_request_platform tests 2020-03-20 14:54:04 +01:00
ftrace linux-kselftest-5.7-rc6 2020-05-15 12:57:50 -07:00
futex .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
gpio selftests: add build/cross-build dependency check script 2020-04-23 17:23:20 -06:00
ia64 .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
intel_pstate selftests: add build/cross-build dependency check script 2020-04-23 17:23:20 -06:00
ipc selftests/ipc: Fix test failure seen after initial test run 2020-04-14 10:24:28 -06:00
ir .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
kcmp .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
kexec sefltest/ima: support appended signatures (modsig) 2019-08-29 12:45:30 -04:00
kmod selftests: kmod: test disabling module autoloading 2020-04-10 15:36:22 -07:00
kselftest kselftest/runner: allow to properly deliver signals to tests 2020-04-14 09:49:13 -06:00
kvm linux-kselftest-5.7-rc5 2020-05-07 15:22:08 -07:00
lib selftests: Move kselftest_module.sh into kselftest/ 2019-11-07 14:46:08 -07:00
livepatch selftests: Install settings files to fix TIMEOUT failures 2020-02-20 08:56:42 -07:00
lkdtm selftests/lkdtm: Use grep -E instead of egrep 2020-05-08 09:46:17 -06:00
locking
media_tests .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
membarrier .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
memfd selftests: add build/cross-build dependency check script 2020-04-23 17:23:20 -06:00
memory-hotplug
mount .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
mqueue .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
net selftests: mptcp: pm: rm the right tmp file 2020-05-15 10:33:56 -07:00
netfilter selftests: netfilter: add nfqueue test case 2020-03-24 20:00:12 +01:00
nsfs tools/testing: Replace zero-length array with flexible-array 2020-05-08 09:42:14 -06:00
ntb New feature to add support for NTB virtual MSI interrupts, the ability 2019-07-21 09:46:59 -07:00
openat2 .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
pid_namespace selftests: add pid namespace ENOMEM regression test 2020-03-25 13:50:34 +01:00
pidfd threads-v5.7 2020-04-04 10:08:18 -07:00
powerpc powerpc updates for 5.7 #2 2020-04-09 11:01:42 -07:00
prctl .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
proc .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
pstore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
ptp .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
ptrace SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
rcutorture SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
resctrl selftests/resctrl: fix spelling mistake "Errror" -> "Error" 2020-03-13 13:29:22 -06:00
rseq .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
rtc .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
safesetid .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
seccomp selftests/seccomp: allow clock_nanosleep instead of nanosleep 2020-04-14 09:49:51 -06:00
sigaltstack .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
size .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
sparc64 .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
splice .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
static_keys treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
sync .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
sysctl treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
tc-testing tc-testing: remove duplicate code in tdc.py 2020-04-07 18:38:55 -07:00
timens SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
timers .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
tmpfs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
tpm2 Revert "Kernel selftests: tpm2: check for tpm support" 2020-04-14 10:08:24 -06:00
uevent
user treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
vDSO .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
vm selftests: vm: Fix 64-bit test builds for powerpc64le 2020-04-13 09:33:46 -06:00
watchdog .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
wireguard ubsan: disable UBSAN_ALIGNMENT under COMPILE_TEST 2020-05-07 19:27:21 -07:00
x86 SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
zram docs: blockdev: add it to the admin-guide 2019-07-15 11:03:01 -03:00
.gitignore SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
gen_kselftest_tar.sh selftests: gen_kselftest_tar.sh: Do not clobber kselftest/ 2019-11-07 14:43:27 -07:00
kselftest.h kselftest: save-and-restore errno to allow for %m formatting 2019-07-30 15:46:48 -06:00
kselftest_deps.sh selftests: add build/cross-build dependency check script 2020-04-23 17:23:20 -06:00
kselftest_harness.h selftests/harness: fix spelling mistake "SIGARLM" -> "SIGALRM" 2020-04-14 09:44:04 -06:00
kselftest_install.sh selftests: gen_kselftest_tar.sh: Do not clobber kselftest/ 2019-11-07 14:43:27 -07:00
kselftest_module.h kselftest: Add test module framework header 2019-04-08 16:44:20 -06:00
lib.mk linux-kselftest-5.7-rc1 2020-04-01 16:09:12 -07:00
Makefile threads-v5.7 2020-04-04 10:08:18 -07:00