CVE-2024-35911

In the Linux kernel, the following vulnerability has been resolved: ice:
fix memory corruption bug with suspend and rebuild The ice driver would
previously panic after suspend. This is caused from the driver only
calling the ice_vsi_free_q_vectors() function by itself, when it is
suspending. Since commit b3e7b3a6ee92 (“ice: prevent NULL pointer deref
during reload”) the driver has zeroed out num_q_vectors, and only restored
it in ice_vsi_cfg_def(). This further causes the ice_rebuild() function to
allocate a zero length buffer, after which num_q_vectors is updated, and
then the new value of num_q_vectors is used to index into the zero length
buffer, which corrupts memory. The fix entails making sure all the code
referencing num_q_vectors only does so after it has been reset via
ice_vsi_cfg_def(). I didn’t perform a full bisect, but I was able to test
against 6.1.77 kernel and that ice driver works fine for suspend/resume
with no panic, so sometime since then, this problem was introduced. Also
clean up an un-needed init of a local variable in the function being
modified. PANIC from 6.8.0-rc1: [1026674.915596] PM: suspend exit
[1026675.664697] ice 0000:17:00.1: PTP reset successful [1026675.664707]
ice 0000:17:00.1: 2755 msecs passed between update to cached PHC time
[1026675.667660] ice 0000:b1:00.0: PTP reset successful [1026675.675944]
ice 0000:b1:00.0: 2832 msecs passed between update to cached PHC time
[1026677.137733] ixgbe 0000:31:00.0 ens787: NIC Link is Up 1 Gbps, Flow
Control: None [1026677.190201] BUG: kernel NULL pointer dereference,
address: 0000000000000010 [1026677.192753] ice 0000:17:00.0: PTP reset
successful [1026677.192764] ice 0000:17:00.0: 4548 msecs passed between
update to cached PHC time [1026677.197928] #PF: supervisor read access in
kernel mode [1026677.197933] #PF: error_code(0x0000) - not-present page
[1026677.197937] PGD 1557a7067 P4D 0 [1026677.212133] ice 0000:b1:00.1: PTP
reset successful [1026677.212143] ice 0000:b1:00.1: 4344 msecs passed
between update to cached PHC time [1026677.212575] [1026677.243142] Oops:
0000 [#1] PREEMPT SMP NOPTI [1026677.247918] CPU: 23 PID: 42790 Comm:
kworker/23:0 Kdump: loaded Tainted: G W 6.8.0-rc1+ #1 [1026677.257989]
Hardware name: Intel Corporation M50CYP2SBSTD/M50CYP2SBSTD, BIOS
SE5C620.86B.01.01.0005.2202160810 02/16/2022 [1026677.269367] Workqueue:
ice ice_service_task [ice] [1026677.274592] RIP:
0010:ice_vsi_rebuild_set_coalesce+0x130/0x1e0 [ice] [1026677.281421] Code:
0f 84 3a ff ff ff 41 0f b7 74 ec 02 66 89 b0 22 02 00 00 81 e6 ff 1f 00 00
e8 ec fd ff ff e9 35 ff ff ff 48 8b 43 30 49 63 ed <41> 0f b7 34 24 41 83
c5 01 48 8b 3c e8 66 89 b7 aa 02 00 00 81 e6 [1026677.300877] RSP:
0018:ff3be62a6399bcc0 EFLAGS: 00010202 [1026677.306556] RAX:
ff28691e28980828 RBX: ff28691e41099828 RCX: 0000000000188000
[1026677.314148] RDX: 0000000000000000 RSI: 0000000000000010 RDI:
ff28691e41099828 [1026677.321730] RBP: 0000000000000000 R08:
0000000000000000 R09: 0000000000000000 [1026677.329311] R10:
0000000000000007 R11: ffffffffffffffc0 R12: 0000000000000010
[1026677.336896] R13: 0000000000000000 R14: 0000000000000000 R15:
ff28691e0eaa81a0 [1026677.344472] FS: 0000000000000000(0000)
GS:ff28693cbffc0000(0000) knlGS:0000000000000000 [1026677.353000] CS: 0010
DS: 0000 ES: 0000 CR0: 0000000080050033 [1026677.359195] CR2:
0000000000000010 CR3: 0000000128df4001 CR4: 0000000000771ef0
[1026677.366779] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000 [1026677.374369] DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400 [1026677.381952] PKRU: 55555554
[1026677.385116] Call Trace: [1026677.388023] <TASK> [1026677.390589] ?
__die+0x20/0x70 [1026677.394105] ? page_fault_oops+0x82/0x160
[1026677.398576] ? do_user_addr_fault+0x65/0x6a0 [1026677.403307] ?
exc_page_fault+0x6a/0x150 [1026677.407694] ? asm_exc_page_fault+0x22/0x30
[1026677.412349] ? ice_vsi_rebuild_set_coalesce+0x130/0x1e0 [ice]
[1026677.4186 —truncated—