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KVM SEV changes for 7.2
- Don't advertise support for unusuable VM types, and account for VM types
that are disabled by firmware, e.g. to mitigate security vulnerabilities.
- Rewrite the SEV {en,de}crypt debug ioctls as they were riddle with bugs and
unnecessarily complicated, and add comprehensive tests.
- Clean up and deduplicate the SEV page pinning code.
- Fix minor goofs related to writing back CPUID information after firmware
rejects a CPUID page for an SNP vCPU.
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KVM selftests changes for 7.2
- Randomize the dirty log test's delay when reaping the bitmap on the first
pass, as always waiting only 1ms hid a KVM RISC-V bug as the test reaped the
bitmap before KVM could build up enough state to hit the bug.
- A pile of one-off fixes and cleanups.
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KVM misc x86 changes for 7.2
- Handle EXIT_FASTPATH_EXIT_USERSPACE in vendor code to ensure vendor code
gets a chance to handle things like reaping the PML buffer.
- Ensure KVM's copy of CR0 and CR3 are up-to-date on SVM prior to invoking
fastpath handlers.
- Update KVM's view of PV async enabling if and only if the MSR write fully
succeeds.
- Fix a variety of issues where the emulator doesn't honor guest-debug state,
and clean up related code along the way.
- Synthesize EPT Violation and #NPF "error code" bits when injecting faults
into L1 that didn't originate in hardware (in which case the VMCS/VMCB
doesn't hold relevant information).
- Add support for virtualizing (well, emulating) AMD's flavor of CPL>0 CPUID
faulting.
- Clean up the GPR APIs so that KVM's use of "raw" is consistent, and fix a
variety of minor bugs along the way.
- Fix an OOB memory access due to not checking the VP ID when handling a
Hyper-V PV TLB flush for L2.
- Fix a bug in the mediated PMU's handling of fixed counters that allowed the
guest to bypass the PMU event filter.
- Allow userspace to return EAGAIN when handling SNP and TDX hypercalls, so
the KVM can forward a "retry" status code to the guest, and reserve all
unused error codes for future usage.
- Misc fixes and cleanups.
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KVM guest_memfd changes for 7.2
- Return -EEXIST instead of -EINVAL if userspace attempts to bind a gmem
range to multiple memslots, and fix the test that was supposed to ensure
KVM returns -EEXIST.
- Treat memslot binding offsets and sizes as unsigned values to fix a bug
where KVM interprets a large "offset + size" as a negative value and allows
a nonsensical offset.
- Use the inode number instead of the page offset for the NUMA interleaving
index to fix a bug where the effective index would jump by two for
consecutive pages (the caller also adds in the page offset).
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* kvm-arm64/vgic-v5-PPI-fixes:
: .
: Substantial cleanup of the vgic-v5 PPI support. From the original
: cover letter:
:
: "With the GICv5 PPi support merged in, it has become obvious that a few
: things could be improved, both from the correctness and maintainability
: angles."
: .
KVM: arm64: Fix arch timer interrupts for GICv3-on-GICv5 guests
irqchip/gic-v5: Immediately exec priority drop following activate
Documentation: KVM: Clarify that PMU_V3_IRQ IntID requirements for GICv5
Documentation: KVM: Fix typos in VGICv5 documentation
KVM: arm64: selftests: Improve error handling for GICv5 PPI selftest
KVM: arm64: selftests: Cleanup unused vars in GICv5 PPI selftest
KVM: arm64: selftests: Add missing GIC CDEN to no-vgic-v5 selftest
KVM: arm64: vgic-v5: Atomically assign bits to PPI DVI bitmap
KVM: arm64: vgic-v5: Add missing trap handing for NV triage
KVM: arm64: vgic-v5: Limit support to 64 PPIs
KVM: arm64: vgic: Rationalise per-CPU irq accessor
KVM: arm64: vgic-v5: Drop defensive checks from vgic_v5_ppi_queue_irq_unlock()
KVM: arm64: vgic: Consolidate vgic_allocate_private_irqs_locked()
KVM: arm64: vgic: Constify struct irq_ops usage
KVM: arm64: vgic-v5: Drop pointless ARM64_HAS_GICV5_CPUIF check
KVM: arm64: vgic-v5: Remove use of __assign_bit() with a constant
KVM: arm64: vgic-v5: Move PPI caps into kvm_vgic_global_state
KVM: arm64: vgic-v5: Add for_each_visible_v5_ppi() iterator
Signed-off-by: Marc Zyngier <maz@kernel.org>
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alloc_mock_res() calls kzalloc() without checking the return value.
Add scope based resource management to deal with the allocated memory
cleanly.
Reported-by: sashiko-bot
Fixes: 67dcdd4d3b83 ("tools/testing/cxl: Introduce a mocked-up CXL port hierarchy")
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260611230305.197390-1-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
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In cxl_test_init(), Once cxl_mock_platform_device_add() succeeds, all
error paths after needs to call platform_device_unregister() instead of
platform_device_put() to clean up.
Fixes: 67dcdd4d3b83 ("tools/testing/cxl: Introduce a mocked-up CXL port hierarchy")
Reported-by: sashiko-bot
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260611230355.198912-1-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
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In aggregation modes (e.g. --per-socket, --per-die, etc.), a counter
might not be scheduled or counted on specific aggregate groups if it was
not assigned to the CPUs belonging to those groups. However, the
printout() check triggers the "print_free_counters_hint" logic
unconditionally for any supported counter with a missing count. This
results in a false "Some events weren't counted. Try disabling the NMI
watchdog" warning.
Furthermore, the NMI watchdog only reserves performance counters on core
PMUs. Uncore PMU events (e.g. CHA, IMC) are not affected by the NMI
watchdog, but their failures also falsely triggered this warning.
This warning was originally introduced in commit 02d492e5dcb72c00 ("perf
stat: Issue a HW watchdog disable hint")
To fix this, restrict setting of print_free_counters_hint to only
trigger for core PMU events by checking counter->pmu and
counter->pmu->is_core.
Example before/after:
$ perf stat -M lpm_miss_lat --metric-only --per-socket -a -- sleep 1
Before:
Performance counter stats for 'system wide':
ns lpm_miss_lat_rem ns lpm_miss_lat_loc
S0 126 202.3 207.9
S1 126 231.9 259.3
1.006029831 seconds time elapsed
Some events weren't counted. Try disabling the NMI watchdog:
echo 0 > /proc/sys/kernel/nmi_watchdog
perf stat ...
echo 1 > /proc/sys/kernel/nmi_watchdog
After:
Performance counter stats for 'system wide':
ns lpm_miss_lat_rem ns lpm_miss_lat_loc
S0 126 202.3 207.9
S1 126 231.9 259.3
1.006029831 seconds time elapsed
Assisted-by: Gemini:gemini-next
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Chun-Tse Shao <ctshao@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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The work loop relies on the compiler not optimizing it away, although
named_threads_work is not static for that reason, the compiler could
still do it.
Fix it by compiling without optimization. Also add -fno-inline for
consistency and in case anyone wants to look at callstacks.
Fixes: b5dd510be55e8670 ("perf test: Add named_threads workload")
Closes: https://lore.kernel.org/all/20260609160001.2739E1F00893@smtp.kernel.org
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Add mod_flow() and the mod-flow CLI command to ovs-dpctl.py, exercising
OVS_FLOW_CMD_SET. Add test_flow_set which first modifies an existing
flow with new actions and verifies the change via traffic, then modifies
the same flow without actions and verifies the kernel handles the
no-actions case gracefully.
The no-actions path is unreachable from userspace OVS tools (dpctl
mod-flow requires actions) but reachable via raw netlink. This is the
code path where Adrian Moreno found a possible kfree_skb of ERR_PTR
when reply allocation fails after locking.
Make parse() skip OVS_FLOW_ATTR_ACTIONS when actstr is None so the
kernel enters the post-lock allocation branch in ovs_flow_cmd_set().
After the no-actions set, verify via dump-flows that the flow retained
its drop action.
Suggested-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Minxi Hou <houminxi@gmail.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://patch.msgid.link/20260609165725.107484-1-houminxi@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Before, they were only checked on demand, but it seems better to check
them each time received ADD_ADDRs are checked.
Errors are only reported when the counter exists, and the value is not
the expected one. This is similar to what is done in chk_join_nr: it
reduces the output, and avoids a lot of 'skip' when validating older
kernels. Also here, some tests need to adapt the default expected
counters, e.g. when ADD_ADDR echo are dropped on the reception side, or
it is not possible to send an ADD_ADDR due to the limited option space.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260605-net-next-mptcp-add-addr6-port-ts-v2-8-758e7ca73f4d@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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This validates the feature added by parent commit, where it is now
possible to send an ADD_ADDR with a v6 IP address and a port number,
while the connection is using TCP Timestamps.
This test is simply a copy of the previous one: "signal address with
port", but using IPv6 addresses. This test is only executed if the
add_addr_v6_port_drop_ts sysctl knob is available. If not, it means the
kernel doesn't support this feature.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260605-net-next-mptcp-add-addr6-port-ts-v2-7-758e7ca73f4d@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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This sysctl is going to be used in the next commits to drop TCP
timestamps option, to be able to send an ADD_ADDR with a v6 IP address
and a port number. It is enabled by default.
This knob is explicitly disabled in the MPTCP Join selftest, with the
"signal addr list progresses after tx drop" subtest, to continue
verifying the previous behaviour where the ADD_ADDR is not sent due to a
lack of space.
While at it, move syn_retrans_before_tcp_fallback down from struct
mptcp_pernet, to avoid creating another 3 bytes hole.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260605-net-next-mptcp-add-addr6-port-ts-v2-4-758e7ca73f4d@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Cross-merge networking fixes after downstream PR (net-7.1-rc8).
Conflicts:
drivers/net/ethernet/wangxun/txgbe/txgbe_aml.c
f67aead16e85 ("net: txgbe: rework service event handling")
57d39faed4c9 ("net: txgbe: improve functions of AML 40G devices")
net/rds/info.c
512db8267b73 ("rds: mark snapshot pages dirty in rds_info_getsockopt()")
6e94eeb2a2a6 ("rds: convert to getsockopt_iter")
Adjacent changes:
include/net/sock.h
1ee90b77b727 ("net: guard timestamp cmsgs to real error queue skbs")
f0de88303d5e ("net: make is_skb_wmem() available to modules")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge updates related to system sleep support, two updates of the
intel_rapl power capping driver, and a pm-graph utility fix for
7.2-rc1:
- Add sysctl interface for DPM watchdog timeouts (Tzung-Bi Shih)
- Use complete() instead of complete_all() in device_pm_sleep_init() to
avoid a false-positive warning from lockdep_assert_RT_in_threaded_ctx()
when CONFIG_PROVE_RAW_LOCK_NESTING is enabled (Jiakai Xu)
- Use a flexible array for CRC uncompressed buffers during hibernation
image saving (Rosen Penev)
- Make the LZ4 algorithm available for hibernation compression (l1rox3)
- Move the preallocate_image() call during hibernation after the
"prepare" phase of the "freeze" transition (Matthew Leach)
- Fix a memory leak in rapl_add_package_cpuslocked() in the intel_rapl
power capping driver and use sysfs_emit() in cpumask_show() in that
driver (Sumeet Pawnikar, Yury Norov)
- Fix ValueError when parsing incomplete device properties in the
pm-graph utility (Gongwei Li)
* pm-sleep:
PM: dpm_watchdog: Add sysctl interface for DPM watchdog timeouts
PM: hibernate: Use flexible array for CRC uncompressed buffers
PM: hibernate: make LZ4 available for hibernation compression
PM: sleep: Use complete() in device_pm_sleep_init()
PM: hibernate: call preallocate_image() after freeze prepare
* pm-powercap:
powercap: intel_rapl: Use sysfs_emit() in cpumask_show()
powercap: intel_rapl: Fix memory leak in rapl_add_package_cpuslocked()
* pm-tools:
PM: tools: pm-graph: fix ValueError when parsing incomplete device properties
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wrapping
When test descriptions are extremely long (e.g., the truncated perf.data
graceful handling test is 103 characters long), they wrap across terminal
boundaries.
Because the ANSI escape code to delete the line (PERF_COLOR_DELETE_LINE)
only clears a single terminal line, visual wrapping leaves orphan
wrapped lines on the screen, which results in the test description being
printed multiple times.
Resolve this by checking the terminal width (get_term_dimensions) and
dynamically truncating the printed test description to fit within the
available columns, leaving safety space for the prefix index and status
suffix.
Also, remove the width padding from the test suite headers which do not
display inline status messages. This prevents their trailing colons from
wrapping onto new lines on standard width terminals.
Finally, avoid GCC 16's -Wformat-truncation warnings by delegating the
description padding to pr_info's %-*s format specifier instead of padding
within a temporary buffer, and clamp the truncation limit to the temporary
buffer's size.
JUnit XML output and the failure summary report still print the full,
untruncated test descriptions.
Assisted-by: Gemini-CLI:Google Gemini 3.1 Pro
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge ACPICA updates for 7.2-rc1 including the following changes:
- Add support for the Legacy Virtual Register (LVR) field in I2C serial
bus resource descriptors to ACPICA (Akhil R)
- Fix multiple issues related to bounds checks, input validation,
use-after-free, and integer overflow checks in the AML interpreter
in ACPICA (ikaros)
- Update the copyright year to 2026 in ACPICA files and make minor
changes related to ACPI 6.6 support (Pawel Chmielewski)
- Remove spurious precision from format used to dump parse trees in
ACPICA (David Laight)
- Add modern standby DSM GUIDs to ACPICA header files (Daniel Schaefer)
- Fix FADT 32/64X length mismatch warning in ACPICA (Abdelkader Boudih)
- Update D3hot/cold device power states definitions in ACPICA header
files (Aymeric Wibo)
- Fix NULL pointer dereference in acpi_ns_custom_package() (Weiming
Shi)
- Update ACPICA version to 20260408 (Saket Dumbre)
* acpica: (27 commits)
ACPICA: add boundary checks in two places
ACPICA: Add package limit checks in parser functions
ACPICA: Update version to 20260408
ACPICA: Update the copyright year to 2026
ACPICA: Remove spurious precision from format used to dump parse trees
ACPICA: Enhance OEM ID and Table ID validation in acpi_ex_load_table_op()
ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()
ACPICA: Enhance buffer validation in acpi_ut_walk_aml_resources()
ACPICA: Add validation for node in acpi_ns_build_normalized_path()
ACPICA: validate handler object type in two places
ACPICA: Improve argument parsing in acpi_ps_get_next_simple_arg()
ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
ACPICA: Prevent adding invalid references
ACPICA: add boundary checks in acpi_ps_get_next_field()
ACPICA: validate byte_count in acpi_ps_get_next_package_length()
ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
ACPICA: fix I2C LVR item count in the conversion table
ACPICA: Mention the LVR bits
ACPICA: Change LVR to 8 bit value
ACPICA: Fetch LVR I2C resource descriptor
...
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Add a kselftest that exercises the RDS getsockopt() paths converted to
the getsockopt_iter() / sockopt_t callback:
- RDS_RECVERR and SO_RDS_TRANSPORT, which return their int value through
copy_to_iter() and report the written length in opt->optlen.
- RDS_INFO_*, which obtains the userspace buffer pages with
iov_iter_extract_pages() (including a non-zero starting page offset)
and lets the info producers copy the snapshot in under a spinlock.
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Allison Henderson <achender@kernel.org>
Link: https://patch.msgid.link/20260608-getsock_more-v3-1-706ecf2ea332@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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This test needs more work, and it fails in non-obvious way
when IPv4 connectivity is not available:
# Exception| CMD[remote]: /tmp/vjquwblf/gukinuzqso_txtime -4 -c mono -t 1780939014114542914 -S None -D None a,0 -r
# Exception| EXIT: -15
Explicitly check for IPv4 support to make the future triage
less painful.
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260609180803.1093428-3-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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The test seems to be written with a single-host loopback
in mind. We need to deploy the binary to remote before
we run it. This is just fixing an obvious issue, but
more work will be needed to make the dual-host setup
work reliably. Most of the runs still fail with:
FAIL: start time already passed
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260609180803.1093428-2-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Add tail-call selftests for prog-array ownership when cgroup storage
is in use. Verify that loading succeeds when callers and callees reuse
the owner's cgroup storage map, and that loading fails for a different
storage map and for the A(storage) -> B(no storage) -> C(storage)
bridge case addressed in the previous commit.
Also verify that a storage-less leaf program which cannot perform tail
calls itself is still allowed to join a storage-owned prog array, while
a storage-less tail-caller is rejected also at map update time.
# LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t tailcalls
[...]
#475/25 tailcalls/tailcall_freplace:OK
#475/26 tailcalls/tailcall_bpf2bpf_freplace:OK
#475/27 tailcalls/tailcall_failure:OK
#475/28 tailcalls/reject_tail_call_spin_lock:OK
#475/29 tailcalls/reject_tail_call_rcu_lock:OK
#475/30 tailcalls/reject_tail_call_preempt_lock:OK
#475/31 tailcalls/reject_tail_call_ref:OK
#475/32 tailcalls/tailcall_sleepable:OK
#475/33 tailcalls/tailcall_cgrp_storage:OK
#475/34 tailcalls/tailcall_cgrp_storage_diff_storage:OK
#475/35 tailcalls/tailcall_cgrp_storage_no_storage:OK
#475/36 tailcalls/tailcall_cgrp_storage_no_storage_leaf:OK
#475/37 tailcalls/tailcall_cgrp_storage_no_storage_bridge:OK
#475 tailcalls:OK
Summary: 1/37 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Lin Ma <malin89@huawei.com>
Signed-off-by: Rongzhen Cui <cuirongzhen@huawei.com>
Signed-off-by: Jingguo Tan <tanjingguo@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260610105539.705887-2-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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build
symbol-minimal.c's read_build_id() iterates ELF notes with the same
pattern as symbol-elf.c's elf_read_build_id(): pointer arithmetic
driven by n_namesz and n_descsz from 32-bit note header fields,
without validating that the name and desc fit within the note section
data. A malformed ELF file with oversized note sizes causes
out-of-bounds reads past the section data buffer.
Add the same bounds check as the libelf path: validate namesz and
descsz individually against remaining data before advancing the
pointer, avoiding size_t overflow on 32-bit.
Fixes: b691f64360ecec49 ("perf symbols: Implement poor man's ELF parser")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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elf_read_build_id() iterates ELF notes using pointer arithmetic
driven by n_namesz and n_descsz from the note headers. Neither
the note header read nor the subsequent name/desc advances are
checked against the section boundary. A malformed ELF file with
oversized note sizes causes out-of-bounds reads past the section
data buffer.
Add two bounds checks: verify the note header fits within the
remaining section data, and verify that namesz + descsz (after
alignment) fits before advancing the pointer.
Fixes: fd7a346ea292074e ("perf symbols: Filename__read_build_id should look at .notes section too")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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When perf_env__insert_bpf_prog_info() returns false (duplicate
program), the error path frees info_linear and info_node but not
info_node->metadata. If bpf_metadata_create() had succeeded, the
metadata allocation is permanently leaked.
Fix by calling bpf_metadata_free() on info_node->metadata before
freeing info_node. bpf_metadata_free() handles NULL, so this is
safe even when bpf_metadata_create() returned NULL.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: fdc3441f2d317b40 ("perf record: collect BPF metadata from new programs")
Cc: Blake Jones <blakejones@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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bpf_metadata_create() calls bpf_metadata_read_map_data() which
allocates map.btf and map.rodata. If the subsequent
bpf_metadata_alloc() fails, the code does 'continue' which skips
bpf_metadata_free_map_data(), permanently leaking both allocations.
Fix by calling bpf_metadata_free_map_data() before continue.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: ab38e84ba9a80581 ("perf record: collect BPF metadata from existing BPF programs")
Cc: Blake Jones <blakejones@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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synthesize_bpf_prog_name() calls btf__type_by_id() and immediately
dereferences the result via t->name_off without checking for NULL.
btf__type_by_id() returns NULL when the type_id is invalid or out
of range. When processing perf.data files, finfo->type_id comes from
untrusted input, so an invalid ID causes a NULL pointer dereference.
Fix by checking t for NULL before dereferencing.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: fc462ac75b36daaa ("perf bpf: Extract logic to create program names from perf_event__synthesize_one_bpf_prog()")
Cc: Song Liu <songliubraving@fb.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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mount_overload() builds an environment variable name like
"PERF_SYSFS_ENVIRONMENT" from fs->name. Two bugs:
1) snprintf() uses name_len as the buffer size instead of sizeof(upper_name).
For fs->name = "sysfs" (len=5), the output is truncated to "PERF" (4
chars + null), so getenv() never finds the intended variable.
2) mem_toupper() only uppercases name_len bytes, converting just the "PERF"
prefix rather than the full string including the filesystem name portion.
Fix by using sizeof(upper_name) for snprintf and strlen(upper_name) for
mem_toupper, so the full "PERF_SYSFS_ENVIRONMENT" string is correctly
formatted and uppercased.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: 73ca85ad364769ff ("tools lib api fs: Add FSTYPE__mount() method")
Cc: Jiri Olsa <jolsa@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
filename__write_int() formats an integer into a 64-byte buffer with
sprintf() then passes sizeof(buf) (64) as the write length. This
writes all 64 bytes including uninitialized stack data past the
formatted string. Most sysfs files reject the oversized write,
making the function always return -1.
Fix by capturing the sprintf() return value and using it as the
write length.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: 3b00ea938653d136 ("tools lib api fs: Add sysfs__write_int function")
Cc: Kan Liang <kan.liang@intel.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
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dso__read_running_kernel_build_id() uses sprintf() to format a sysfs
path from machine->root_dir into a PATH_MAX buffer. If root_dir is
close to PATH_MAX in length, appending "/sys/kernel/notes" (18 bytes)
overflows the stack buffer.
Switch to snprintf() with sizeof(path) to prevent the overflow.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: cdd059d731eeb466 ("perf tools: Move dso_* related functions into dso object")
Cc: Jiri Olsa <jolsa@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
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hwmon_pmu__read_events() reads label files with read() into a stack
buffer, strips trailing newlines, then checks buf[0] == '\0'. When
read() returns 0 (empty file) or -1 (error), the buffer is never
written, so buf[0] reads uninitialized stack memory. If the garbage
byte is non-zero, the code falls through to strdup(buf) which copies
arbitrary stack data as the label string.
Fix by checking read_len <= 0 before accessing buf contents, closing
the fd and skipping the entry.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: 53cc0b351ec99278 ("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs")
Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
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filename__decompress()
filename__decompress() has an early return path for files that are not
actually compressed. This path returns the fd from open() directly but
never writes to the pathname output parameter, leaving the caller with
an uninitialized buffer despite a successful return.
Callers like dso__decompress_kmodule_path() pass pathname to
decompress_kmodule() which uses it to set the decompressed file path.
If pathname is uninitialized, subsequent operations on the path produce
undefined behavior.
Fix by setting pathname to an empty string on the uncompressed path.
Callers already check for an empty pathname to distinguish temporary
decompressed files (which need unlink) from the original file.
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: 7ac22b088afe26a4 ("perf tools: Add filename__decompress function")
Cc: Jiri Olsa <jolsa@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
When sysfs__read_build_id() matches NT_GNU_BUILD_ID with the right
namesz but the name content is not "GNU", it falls back to reading
descsz bytes into the stack buffer bf[BUFSIZ]:
} else if (read(fd, bf, descsz) != (ssize_t)descsz)
Unlike the else branch which validates namesz + descsz against
sizeof(bf), this path passes descsz directly to read() without any
bounds check. A crafted sysfs file with a large n_descsz overflows
the 8192-byte stack buffer.
Add a descsz > sizeof(bf) check before the read, breaking out of
the loop on oversized values.
Fixes: e5a1845fc0aeca85 ("perf symbols: Split out util/symbol-elf.c")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
parse_hwmon_filename() strips the "_alarm" suffix from event names
by copying into a 24-byte stack buffer:
strlcpy(fn_type, fn_item, fn_item_len - 5);
The third argument is the source length minus the suffix, not the
destination buffer capacity. A long event name ending in "_alarm"
can have fn_item_len - 5 > sizeof(fn_type), causing strlcpy() to
write past the 24-byte fn_type[] array. The assert() only validates
that the longest *valid* hwmon item fits, but does not protect
against crafted input.
Clamp the strlcpy size to min(fn_item_len - 5, sizeof(fn_type)).
Fixes: 4810b761f812da3c ("perf hwmon_pmu: Add hwmon filename parser")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
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hwmon_pmu__for_each_event() formats description strings via:
len = snprintf(desc_buf, sizeof(desc_buf), "%s in unit %s named %s.", ...);
len += hwmon_pmu__describe_items(hwm, desc_buf + len, sizeof(desc_buf) - len, ...);
If value->label is long enough to cause snprintf() to truncate, it
returns the would-have-been-written count, making len exceed
sizeof(desc_buf). The subsequent sizeof(desc_buf) - len underflows
to a huge size_t value, disabling bounds checking in
hwmon_pmu__describe_items().
The alias_buf snprintf has the same issue. Switch both to scnprintf()
which returns actual bytes written.
Fixes: 53cc0b351ec99278 ("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Three functions read sysfs files into fixed-size stack buffers using
the full buffer size, then null-terminate at buf[read_len]. If the
read fills the buffer exactly, read_len equals sizeof(buf) and the
null byte writes one past the array, corrupting an adjacent stack
variable.
Fix all three by reading sizeof(buf) - 1 bytes, reserving space for
the null terminator:
- hwmon_pmu__read_events(): buf[128]
- hwmon_pmu__describe_items(): buf[64]
- evsel__hwmon_pmu_read(): buf[32]
Fixes: 53cc0b351ec99278 ("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
thread__set_comm_from_proc() calls procfs__read_str() then strips
the trailing newline via comm[sz - 1] = '\0'. procfs__read_str()
allocates the buffer before reading, so on an empty /proc/pid/comm
(reachable during late exit teardown) it returns success with sz = 0
and an unterminated heap buffer.
The sz - 1 underflow was the original sashiko finding: it writes a
null byte before the allocation. But even with a sz > 0 guard on
the newline strip, the unterminated buffer would still be passed to
thread__set_comm() which calls strlen() — an unbounded heap read.
Fix by treating sz == 0 as failure: free the buffer and return -1.
This is consistent with pmu.c's perf_pmu__parse_scale/unit which
already treat len == 0 from filename__read_str as an error.
Fixes: 2f3027ac28bf6bc3 ("perf thread: Introduce method to set comm from /proc/pid/self")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
dump_insn() tracks remaining buffer space with a 'left' variable,
but the loop subtracts the cumulative offset 'n' each iteration
instead of just the per-iteration delta:
n += snprintf(x->out + n, left, "%02x ", inbuf[i]);
left -= n; /* BUG: n is cumulative, not the delta */
After two iterations left goes massively negative, wrapping to a
huge value when passed as size_t to snprintf(), disabling all bounds
checking for the rest of the loop.
Switch to scnprintf() accumulation using sizeof(x->out) - n as the
remaining space, which is always correct and eliminates the separate
'left' variable entirely.
Fixes: 48d02a1d5c137d36 ("perf script: Add 'brstackinsn' for branch stacks")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
mkstemp() creates file descriptors without the close-on-exec flag.
These fds leak to child processes spawned during symbol resolution
(addr2line, objdump), wasting descriptors and potentially exposing
temporary file contents.
Replace mkstemp() with mkostemp(tmpbuf, O_CLOEXEC) at all three
call sites:
- filename__decompress() in dso.c
- read_gnu_debugdata() in symbol-elf.c
- kcore__init() in symbol-elf.c
Fixes: 42b3fa670825983f ("perf tools: Introduce dso__decompress_kmodule_{fd,path}")
Fixes: b10f74308e130527 ("perf symbol: Support .gnu_debugdata for symbols")
Fixes: afba19d9dc8eba66 ("perf symbols: Workaround objdump difficulties with kcore")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
filename__read_debuglink() copies .gnu_debuglink section data into a
caller-provided buffer via:
strncpy(debuglink, data->d_buf, size);
where size is PATH_MAX. If the ELF section is smaller than size and
lacks a null terminator, strncpy reads past data->d_buf into adjacent
memory. A malformed ELF file can trigger this, potentially causing a
segfault or leaking heap data.
Additionally, strncpy does not guarantee null termination when the
source fills the buffer.
Replace with an explicit memcpy bounded by both the output buffer
size and the actual section data size (data->d_size), followed by
explicit null termination.
Fixes: e5a1845fc0aeca85 ("perf symbols: Split out util/symbol-elf.c")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
sysfs__read_build_id() reads ELF note headers from sysfs files. The
note's namesz and descsz fields are used to compute the skip size:
int n = namesz + descsz;
if (n > (int)sizeof(bf))
Both namesz and descsz are size_t from NOTE_ALIGN() of 32-bit note
header fields. Their sum can exceed INT_MAX, overflowing the signed
int n to a negative value. The check n > sizeof(bf) then evaluates
false (negative < positive in signed comparison), and read(fd, bf, n)
reinterprets the negative n as a huge size_t count — the kernel writes
up to MAX_RW_COUNT bytes into the 8192-byte stack buffer.
In practice the overflow is bounded by the sysfs file's actual size,
so a real sysfs notes file won't trigger it organically. But crafted
input (e.g. via a mounted debugfs/sysfs image) could.
Fix by validating namesz and descsz individually against the buffer
size before summing, and change n to size_t to avoid the signed
overflow entirely.
Fixes: f1617b40596cb341 ("perf symbols: Record the build_ids of kernel modules too")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
filename__read_int() passes a stack buffer to read() using the full
sizeof(line) and then hands it to atoi() without null-terminating.
If a sysfs file fills the 64-byte buffer exactly, atoi() reads past
the array into uninitialized stack memory.
filename__read_ull_base() has the same issue with strtoull().
Fix both by reading sizeof(line) - 1 bytes and explicitly
null-terminating after a successful read.
Fixes: 3a351127cbc682c3 ("tools lib fs: Adopt filename__read_int from tools/perf/")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
perf_pmu__parse_scale() reads a PMU scale file then accesses
scale[sret - 1] to strip a trailing newline. Only sret < 0 is
guarded, so an empty file (sret == 0) causes scale[-1] — a stack
buffer underflow that reads and potentially writes out of bounds.
perf_pmu__parse_unit() has the same pattern: alias->unit[sret - 1]
with sret == 0 accesses the byte before the struct member, which
may corrupt the adjacent pmu_name pointer field.
Change both guards from sret < 0 to sret <= 0 so that empty files
are treated as read errors.
Fixes: 410136f5dd96b601 ("tools/perf/stat: Add event unit and scale support")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
pmu_id() calls filename__read_str() then strips the trailing newline
via str[len - 1] = 0. If the PMU identifier file is empty,
filename__read_str() succeeds with len = 0. len - 1 underflows
size_t to SIZE_MAX, writing a null byte before the heap allocation.
Add a len == 0 check before the newline stripping.
Fixes: 51d548471510843e ("perf pmu: Add pmu_id()")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
I found this error when I pass EXTRA_CFLAGS=-fsanitize=address on Fedora
44 with GCC 16. Fix it by copying one less byte.
CC util/jitdump.o
util/jitdump.c: In function ‘jit_process’:
util/jitdump.c:237:9: error: ‘__builtin_strncpy’ specified bound 4096 equals destination size
[-Werror=stringop-truncation]
237 | strncpy(jd->dir, name, PATH_MAX);
| ^
cc1: all warnings being treated as errors
make[4]: *** [tools/build/Makefile.build:95: util/jitdump.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [tools/build/Makefile.build:158: util] Error 2
make[2]: *** [Makefile.perf:578: perf-util-in.o] Error 2
make[1]: *** [Makefile.perf:288: sub-make] Error 2
make: *** [Makefile:76: all] Error 2
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
There is a subfolder for Coresight tests so might as well keep them all
in here.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
We can use exit snapshot to limit the amount of trace to decode here
too. Also each call to objdump is quite expensive on kcore so limit it
to 2 samples instead of 30. We only want to see if there is no data at
all.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
If we reduce the number of samples searched to speed up the test, then
there will be less chance of hitting one of these branches. Extend the
regex to cover all branches so the test will always pass.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Hits in modules return empty disassembly with vmlinux as an input to
objdump. Make the disassembly test more reliable by always using kcore.
And update the comments to say that this is supported by the script.
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
These are now unused and had various issues like not working with out of
source builds and being slow to compile. Delete them.
Signed-off-by: James Clark <james.clark@linaro.org>
Tested-by: Leo Yan <leo.yan@arm.com>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Like the name says, this should be the most basic test possible. Kernel
recording is slow and already has coverage on the systemwide test. Perf
report output also has coverage elsewhere. 'ls' also produces more trace
than 'true'.
We only want to test if the combination of recording options works at
all, so fix all of these things to make it as fast as possible.
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Amir Ayupov <aaupov@meta.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
