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Filename Latest commit message Latest commit date
Ido Schimmel 8161263362 lib: objagg: Fix general protection fault
[ Upstream commit b4a3a89fffcdf09702b1f161b914e52abca1894d ]

The library supports aggregation of objects into other objects only if
the parent object does not have a parent itself. That is, nesting is not
supported.

Aggregation happens in two cases: Without and with hints, where hints
are a pre-computed recommendation on how to aggregate the provided
objects.

Nesting is not possible in the first case due to a check that prevents
it, but in the second case there is no check because the assumption is
that nesting cannot happen when creating objects based on hints. The
violation of this assumption leads to various warnings and eventually to
a general protection fault [1].

Before fixing the root cause, error out when nesting happens and warn.

[1]
general protection fault, probably for non-canonical address 0xdead000000000d90: 0000 [#1] PREEMPT SMP PTI
CPU: 1 PID: 1083 Comm: kworker/1:9 Tainted: G        W          6.9.0-rc6-custom-gd9b4f1cca7fb #7
Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019
Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work
RIP: 0010:mlxsw_sp_acl_erp_bf_insert+0x25/0x80
[...]
Call Trace:
 <TASK>
 mlxsw_sp_acl_atcam_entry_add+0x256/0x3c0
 mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0
 mlxsw_sp_acl_tcam_vchunk_migrate_one+0x16b/0x270
 mlxsw_sp_acl_tcam_vregion_rehash_work+0xbe/0x510
 process_one_work+0x151/0x370
 worker_thread+0x2cb/0x3e0
 kthread+0xd0/0x100
 ret_from_fork+0x34/0x50
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Fixes: 9069a3817d ("lib: objagg: implement optimization hints assembly and use hints for object creation")
Reported-by: Alexander Zubkov <green@qrator.net>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Tested-by: Alexander Zubkov <green@qrator.net>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-08-19 05:33:28 +02:00
arch m68k: cmpxchg: Fix return value for default case in __arch_xchg() 2024-08-19 05:33:27 +02:00
block
certs
crypto crypto: ecrdsa - Fix module auto-load on add_key 2024-06-16 13:28:51 +02:00
Documentation ASoC: dt-bindings: rt5645: add cbj sleeve gpio property 2024-06-16 13:28:31 +02:00
drivers wifi: brcmsmac: LCN PHY code is used for BCM4313 2G-only device 2024-08-19 05:33:28 +02:00
fs hfsplus: fix to avoid false alarm of circular locking 2024-08-19 05:33:25 +02:00
include SUNRPC: Fix RPC client cleaned up the freed pipefs dentries 2024-07-18 11:40:56 +02:00
init
ipc
kernel mm: optimize the redundant loop of mm_update_owner_next() 2024-07-18 11:40:51 +02:00
lib lib: objagg: Fix general protection fault 2024-08-19 05:33:28 +02:00
LICENSES
mm Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" 2024-07-18 11:40:51 +02:00
net net/smc: set rmb's SG_MAX_SINGLE_ALLOC limitation only when CONFIG_ARCH_NO_SG_CHAIN is defined 2024-08-19 05:33:28 +02:00
samples
scripts kconfig: remove wrong expr_trans_bool() 2024-07-27 10:38:29 +02:00
security
sound ALSA: hda/realtek: Enable headset mic on Positivo SU C1400 2024-07-27 10:38:33 +02:00
tools selftests/bpf: Check length of recv in test_sockmap 2024-08-19 05:33:28 +02:00
usr
virt KVM: async_pf: Cleanup kvm_setup_async_pf() 2024-05-02 16:18:32 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
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COPYING
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Kconfig
MAINTAINERS
Makefile Linux 5.4.281 2024-07-27 10:38:33 +02:00
README

Linux kernel
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There are various text files in the Documentation/ subdirectory,
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