linux-stable.git/tools, branch v6.6.100

Revert "selftests/bpf: dummy_st_ops should reject 0 for non-nullable params"

2025-07-24T06:53:22+00:00

This reverts commit e7d193073a223663612301c659e53795b991ca89 which is
commit 6a2d30d3c5bf9f088dcfd5f3746b04d84f2fab83 upstream.

The dummy_st_ops/dummy_sleepable_reject_null test requires commit 980ca8ceeae6
("bpf: check bpf_dummy_struct_ops program params for test runs"), which in turn
depends on "Support PTR_MAYBE_NULL for struct_ops arguments" series (see link
below), neither are backported to stable 6.6.

Link: https://lore.kernel.org/all/20240209023750.1153905-1-thinker.li@gmail.com/
Signed-off-by: Shung-Hsi Yu 
Signed-off-by: Greg Kroah-Hartman

Revert "selftests/bpf: adjust dummy_st_ops_success to detect additional error"

2025-07-24T06:53:22+00:00

This reverts commit 264451a364dba5ca6cb2878126a9798dfc0b1a06 which is
commit 3b3b84aacb4420226576c9732e7b539ca7b79633 upstream.

The updated dummy_st_ops test requires commit 1479eaff1f16 ("bpf: mark
bpf_dummy_struct_ops.test_1 parameter as nullable"), which in turn depends on
"Support PTR_MAYBE_NULL for struct_ops arguments" series (see link below),
neither are backported to stable 6.6.

Without them the kernel simply panics from null pointer dereference half way
through running BPF selftests.

    #68/1    deny_namespace/unpriv_userns_create_no_bpf:OK
    #68/2    deny_namespace/userns_create_bpf:OK
    #68      deny_namespace:OK
    [   26.829153] BUG: kernel NULL pointer dereference, address: 0000000000000000
    [   26.831136] #PF: supervisor read access in kernel mode
    [   26.832635] #PF: error_code(0x0000) - not-present page
    [   26.833999] PGD 0 P4D 0
    [   26.834771] Oops: 0000 [#1] PREEMPT SMP PTI
    [   26.835997] CPU: 2 PID: 119 Comm: test_progs Tainted: G           OE      6.6.66-00003-gd80551078e71 #3
    [   26.838774] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
    [   26.841152] RIP: 0010:bpf_prog_8ee9cbe7c9b5a50f_test_1+0x17/0x24
    [   26.842877] Code: 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa 0f 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 48 8b 7f 00 <8b> 47 00 be 5a 00 00 00 89 77 00 c9 c3 cc cc cc cc cc cc cc cc c0
    [   26.847953] RSP: 0018:ffff9e6b803b7d88 EFLAGS: 00010202
    [   26.849425] RAX: 0000000000000001 RBX: 0000000000000001 RCX: 2845e103d7dffb60
    [   26.851483] RDX: 0000000000000000 RSI: 0000000084d09025 RDI: 0000000000000000
    [   26.853508] RBP: ffff9e6b803b7d88 R08: 0000000000000001 R09: 0000000000000000
    [   26.855670] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9754c0b5f700
    [   26.857824] R13: ffff9754c09cc800 R14: ffff9754c0b5f680 R15: ffff9754c0b5f760
    [   26.859741] FS:  00007f77dee12740(0000) GS:ffff9754fbc80000(0000) knlGS:0000000000000000
    [   26.862087] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [   26.863705] CR2: 0000000000000000 CR3: 00000001020e6003 CR4: 0000000000170ee0
    [   26.865689] Call Trace:
    [   26.866407]  
    [   26.866982]  ? __die+0x24/0x70
    [   26.867774]  ? page_fault_oops+0x15b/0x450
    [   26.868882]  ? search_bpf_extables+0xb0/0x160
    [   26.870076]  ? fixup_exception+0x26/0x330
    [   26.871214]  ? exc_page_fault+0x64/0x190
    [   26.872293]  ? asm_exc_page_fault+0x26/0x30
    [   26.873352]  ? bpf_prog_8ee9cbe7c9b5a50f_test_1+0x17/0x24
    [   26.874705]  ? __bpf_prog_enter+0x3f/0xc0
    [   26.875718]  ? bpf_struct_ops_test_run+0x1b8/0x2c0
    [   26.876942]  ? __sys_bpf+0xc4e/0x2c30
    [   26.877898]  ? __x64_sys_bpf+0x20/0x30
    [   26.878812]  ? do_syscall_64+0x37/0x90
    [   26.879704]  ? entry_SYSCALL_64_after_hwframe+0x78/0xe2
    [   26.880918]  
    [   26.881409] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE)]
    [   26.883095] CR2: 0000000000000000
    [   26.883934] ---[ end trace 0000000000000000 ]---
    [   26.885099] RIP: 0010:bpf_prog_8ee9cbe7c9b5a50f_test_1+0x17/0x24
    [   26.886452] Code: 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa 0f 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 48 8b 7f 00 <8b> 47 00 be 5a 00 00 00 89 77 00 c9 c3 cc cc cc cc cc cc cc cc c0
    [   26.890379] RSP: 0018:ffff9e6b803b7d88 EFLAGS: 00010202
    [   26.891450] RAX: 0000000000000001 RBX: 0000000000000001 RCX: 2845e103d7dffb60
    [   26.892779] RDX: 0000000000000000 RSI: 0000000084d09025 RDI: 0000000000000000
    [   26.894254] RBP: ffff9e6b803b7d88 R08: 0000000000000001 R09: 0000000000000000
    [   26.895630] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9754c0b5f700
    [   26.897008] R13: ffff9754c09cc800 R14: ffff9754c0b5f680 R15: ffff9754c0b5f760
    [   26.898337] FS:  00007f77dee12740(0000) GS:ffff9754fbc80000(0000) knlGS:0000000000000000
    [   26.899972] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [   26.901076] CR2: 0000000000000000 CR3: 00000001020e6003 CR4: 0000000000170ee0
    [   26.902336] Kernel panic - not syncing: Fatal exception
    [   26.903639] Kernel Offset: 0x36000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
    [   26.905693] ---[ end Kernel panic - not syncing: Fatal exception ]---

Link: https://lore.kernel.org/all/20240209023750.1153905-1-thinker.li@gmail.com/
Signed-off-by: Shung-Hsi Yu 
Signed-off-by: Greg Kroah-Hartman

selftests: net: increase inter-packet timeout in udpgro.sh

2025-07-24T06:53:18+00:00

[ Upstream commit 0e9418961f897be59b1fab6e31ae1b09a0bae902 ]

The mentioned test is not very stable when running on top of
debug kernel build. Increase the inter-packet timeout to allow
more slack in such environments.

Fixes: 3327a9c46352 ("selftests: add functionals test for UDP GRO")
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/b0370c06ddb3235debf642c17de0284b2cd3c652.1752163107.git.pabeni@redhat.com
Signed-off-by: Paolo Abeni 
Signed-off-by: Sasha Levin

selftests/bpf: adapt one more case in test_lru_map to the new target_free

2025-07-17T16:35:22+00:00

commit 5e9388f7984a9cc7e659a105113f6ccf0aebedd0 upstream.

The below commit that updated BPF_MAP_TYPE_LRU_HASH free target,
also updated tools/testing/selftests/bpf/test_lru_map to match.

But that missed one case that passes with 4 cores, but fails at
higher cpu counts.

Update test_lru_sanity3 to also adjust its expectation of target_free.

This time tested with 1, 4, 16, 64 and 384 cpu count.

Fixes: d4adf1c9ee77 ("bpf: Adjust free target to avoid global starvation of LRU map")
Signed-off-by: Willem de Bruijn 
Link: https://lore.kernel.org/r/20250625210412.2732970-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Alexei Starovoitov 
Signed-off-by: Greg Kroah-Hartman

bpf: Adjust free target to avoid global starvation of LRU map

2025-07-17T16:35:21+00:00

[ Upstream commit d4adf1c9ee7722545450608bcb095fb31512f0c6 ]

BPF_MAP_TYPE_LRU_HASH can recycle most recent elements well before the
map is full, due to percpu reservations and force shrink before
neighbor stealing. Once a CPU is unable to borrow from the global map,
it will once steal one elem from a neighbor and after that each time
flush this one element to the global list and immediately recycle it.

Batch value LOCAL_FREE_TARGET (128) will exhaust a 10K element map
with 79 CPUs. CPU 79 will observe this behavior even while its
neighbors hold 78 * 127 + 1 * 15 == 9921 free elements (99%).

CPUs need not be active concurrently. The issue can appear with
affinity migration, e.g., irqbalance. Each CPU can reserve and then
hold onto its 128 elements indefinitely.

Avoid global list exhaustion by limiting aggregate percpu caches to
half of map size, by adjusting LOCAL_FREE_TARGET based on cpu count.
This change has no effect on sufficiently large tables.

Similar to LOCAL_NR_SCANS and lru->nr_scans, introduce a map variable
lru->free_target. The extra field fits in a hole in struct bpf_lru.
The cacheline is already warm where read in the hot path. The field is
only accessed with the lru lock held.

Tested-by: Anton Protopopov 
Signed-off-by: Willem de Bruijn 
Acked-by: Stanislav Fomichev 
Link: https://lore.kernel.org/r/20250618215803.3587312-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Alexei Starovoitov 
Signed-off-by: Sasha Levin

x86/rdrand: Disable RDSEED on AMD Cyan Skillfish

2025-07-17T16:35:15+00:00

commit 5b937a1ed64ebeba8876e398110a5790ad77407c upstream.

AMD Cyan Skillfish (Family 17h, Model 47h, Stepping 0h) has an error that
causes RDSEED to always return 0xffffffff, while RDRAND works correctly.

Mask the RDSEED cap for this CPU so that both /proc/cpuinfo and direct CPUID
read report RDSEED as unavailable.

  [ bp: Move to amd.c, massage. ]

Signed-off-by: Mikhail Paulyshka 
Signed-off-by: Borislav Petkov (AMD) 
Cc: 
Link: https://lore.kernel.org/20250524145319.209075-1-me@mixaill.net
Signed-off-by: Greg Kroah-Hartman

kallsyms: fix build without execinfo

2025-07-17T16:35:14+00:00

commit a95743b53031b015e8949e845a9f6fdfb2656347 upstream.

Some libc's like musl libc don't provide execinfo.h since it's not part of
POSIX.  In order to fix compilation on musl, only include execinfo.h if
available (HAVE_BACKTRACE_SUPPORT)

This was discovered with c104c16073b7 ("Kunit to check the longest symbol
length") which starts to include linux/kallsyms.h with Alpine Linux'
configs.

Link: https://lkml.kernel.org/r/20250622014608.448718-1-fossdd@pwned.life
Fixes: c104c16073b7 ("Kunit to check the longest symbol length")
Signed-off-by: Achill Gilgenast 
Cc: Luis Henriques 
Cc: Greg Kroah-Hartman 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

perf: build: Setup PKG_CONFIG_LIBDIR for cross compilation

2025-07-17T16:35:11+00:00

commit 440cf77625e300e683ca0edc39fbc4b6f3175feb upstream.

On recent Linux distros like Ubuntu Noble and Debian Bookworm, the
'pkg-config-aarch64-linux-gnu' package is missing. As a result, the
aarch64-linux-gnu-pkg-config command is not available, which causes
build failures.

When a build passes the environment variables PKG_CONFIG_LIBDIR or
PKG_CONFIG_PATH, like a user uses make command or a build system
(like Yocto, Buildroot, etc) prepares the variables and passes to the
Perf's Makefile, the commit keeps these variables for package
configuration. Otherwise, this commit sets the PKG_CONFIG_LIBDIR
variable to use the Multiarch libs for the cross compilation.

Signed-off-by: Leo Yan 
Tested-by: Ian Rogers 
Cc: amadio@gentoo.org
Cc: Thomas Richter 
Link: https://lore.kernel.org/r/20240717082211.524826-2-leo.yan@arm.com
Signed-off-by: Namhyung Kim 
Cc: Alexis Lothoré 
Signed-off-by: Greg Kroah-Hartman

libbpf: Fix possible use-after-free for externs

2025-07-06T09:00:12+00:00

[ Upstream commit fa6f092cc0a02d0fcee37e9e8172eda372a03d33 ]

The `name` field in `obj->externs` points into the BTF data at initial
open time. However, some functions may invalidate this after opening and
before loading (e.g. `bpf_map__set_value_size`), which results in
pointers into freed memory and undefined behavior.

The simplest solution is to simply `strdup` these strings, similar to
the `essent_name`, and free them at the same time.

In order to test this path, the `global_map_resize` BPF selftest is
modified slightly to ensure the presence of an extern, which causes this
test to fail prior to the fix. Given there isn't an obvious API or error
to test against, I opted to add this to the existing test as an aspect
of the resizing feature rather than duplicate the test.

Fixes: 9d0a23313b1a ("libbpf: Add capability for resizing datasec maps")
Signed-off-by: Adin Scannell 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20250625050215.2777374-1-amscanne@meta.com
Signed-off-by: Sasha Levin

libbpf: Fix null pointer dereference in btf_dump__free on allocation failure

2025-07-06T09:00:11+00:00

[ Upstream commit aa485e8789d56a4573f7c8d000a182b749eaa64d ]

When btf_dump__new() fails to allocate memory for the internal hashmap
(btf_dump->type_names), it returns an error code. However, the cleanup
function btf_dump__free() does not check if btf_dump->type_names is NULL
before attempting to free it. This leads to a null pointer dereference
when btf_dump__free() is called on a btf_dump object.

Fixes: 351131b51c7a ("libbpf: add btf_dump API for BTF-to-C conversion")
Signed-off-by: Yuan Chen 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20250618011933.11423-1-chenyuan_fl@163.com
Signed-off-by: Sasha Levin