[pve-devel] [PATCH kernel 2/2] cherry-pick fix for bnxt_re driver

[Fiona Ebner <f.ebner@proxmox.com>]

Reported in the community forum:
https://forum.proxmox.com/threads/144557/post-689148

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---

Cherry-picked from the Ubuntu-6.8.0-43.43 tag, so not required if
updating to that.

 ...ift-undefined-behavior-in-bnxt_qplib.patch | 124 ++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 patches/kernel/0024-bnxt_re-avoid-shift-undefined-behavior-in-bnxt_qplib.patch

diff --git a/patches/kernel/0024-bnxt_re-avoid-shift-undefined-behavior-in-bnxt_qplib.patch b/patches/kernel/0024-bnxt_re-avoid-shift-undefined-behavior-in-bnxt_qplib.patch
new file mode 100644
index 0000000..75bc01a
--- /dev/null
+++ b/patches/kernel/0024-bnxt_re-avoid-shift-undefined-behavior-in-bnxt_qplib.patch
@@ -0,0 +1,124 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Michal Schmidt <mschmidt@redhat.com>
+Date: Tue, 7 May 2024 12:39:28 +0200
+Subject: [PATCH] bnxt_re: avoid shift undefined behavior in
+ bnxt_qplib_alloc_init_hwq
+
+BugLink: https://bugs.launchpad.net/bugs/2071621
+
+[ Upstream commit 78cfd17142ef70599d6409cbd709d94b3da58659 ]
+
+Undefined behavior is triggered when bnxt_qplib_alloc_init_hwq is called
+with hwq_attr->aux_depth != 0 and hwq_attr->aux_stride == 0.
+In that case, "roundup_pow_of_two(hwq_attr->aux_stride)" gets called.
+roundup_pow_of_two is documented as undefined for 0.
+
+Fix it in the one caller that had this combination.
+
+The undefined behavior was detected by UBSAN:
+  UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13
+  shift exponent 64 is too large for 64-bit type 'long unsigned int'
+  CPU: 24 PID: 1075 Comm: (udev-worker) Not tainted 6.9.0-rc6+ #4
+  Hardware name: Abacus electric, s.r.o. - servis@abacus.cz Super Server/H12SSW-iN, BIOS 2.7 10/25/2023
+  Call Trace:
+   <TASK>
+   dump_stack_lvl+0x5d/0x80
+   ubsan_epilogue+0x5/0x30
+   __ubsan_handle_shift_out_of_bounds.cold+0x61/0xec
+   __roundup_pow_of_two+0x25/0x35 [bnxt_re]
+   bnxt_qplib_alloc_init_hwq+0xa1/0x470 [bnxt_re]
+   bnxt_qplib_create_qp+0x19e/0x840 [bnxt_re]
+   bnxt_re_create_qp+0x9b1/0xcd0 [bnxt_re]
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? __kmalloc+0x1b6/0x4f0
+   ? create_qp.part.0+0x128/0x1c0 [ib_core]
+   ? __pfx_bnxt_re_create_qp+0x10/0x10 [bnxt_re]
+   create_qp.part.0+0x128/0x1c0 [ib_core]
+   ib_create_qp_kernel+0x50/0xd0 [ib_core]
+   create_mad_qp+0x8e/0xe0 [ib_core]
+   ? __pfx_qp_event_handler+0x10/0x10 [ib_core]
+   ib_mad_init_device+0x2be/0x680 [ib_core]
+   add_client_context+0x10d/0x1a0 [ib_core]
+   enable_device_and_get+0xe0/0x1d0 [ib_core]
+   ib_register_device+0x53c/0x630 [ib_core]
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   bnxt_re_probe+0xbd8/0xe50 [bnxt_re]
+   ? __pfx_bnxt_re_probe+0x10/0x10 [bnxt_re]
+   auxiliary_bus_probe+0x49/0x80
+   ? driver_sysfs_add+0x57/0xc0
+   really_probe+0xde/0x340
+   ? pm_runtime_barrier+0x54/0x90
+   ? __pfx___driver_attach+0x10/0x10
+   __driver_probe_device+0x78/0x110
+   driver_probe_device+0x1f/0xa0
+   __driver_attach+0xba/0x1c0
+   bus_for_each_dev+0x8f/0xe0
+   bus_add_driver+0x146/0x220
+   driver_register+0x72/0xd0
+   __auxiliary_driver_register+0x6e/0xd0
+   ? __pfx_bnxt_re_mod_init+0x10/0x10 [bnxt_re]
+   bnxt_re_mod_init+0x3e/0xff0 [bnxt_re]
+   ? __pfx_bnxt_re_mod_init+0x10/0x10 [bnxt_re]
+   do_one_initcall+0x5b/0x310
+   do_init_module+0x90/0x250
+   init_module_from_file+0x86/0xc0
+   idempotent_init_module+0x121/0x2b0
+   __x64_sys_finit_module+0x5e/0xb0
+   do_syscall_64+0x82/0x160
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? syscall_exit_to_user_mode_prepare+0x149/0x170
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? syscall_exit_to_user_mode+0x75/0x230
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? do_syscall_64+0x8e/0x160
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? __count_memcg_events+0x69/0x100
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? count_memcg_events.constprop.0+0x1a/0x30
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? handle_mm_fault+0x1f0/0x300
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? do_user_addr_fault+0x34e/0x640
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   ? srso_alias_return_thunk+0x5/0xfbef5
+   entry_SYSCALL_64_after_hwframe+0x76/0x7e
+  RIP: 0033:0x7f4e5132821d
+  Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e3 db 0c 00 f7 d8 64 89 01 48
+  RSP: 002b:00007ffca9c906a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
+  RAX: ffffffffffffffda RBX: 0000563ec8a8f130 RCX: 00007f4e5132821d
+  RDX: 0000000000000000 RSI: 00007f4e518fa07d RDI: 000000000000003b
+  RBP: 00007ffca9c90760 R08: 00007f4e513f6b20 R09: 00007ffca9c906f0
+  R10: 0000563ec8a8faa0 R11: 0000000000000246 R12: 00007f4e518fa07d
+  R13: 0000000000020000 R14: 0000563ec8409e90 R15: 0000563ec8a8fa60
+   </TASK>
+  ---[ end trace ]---
+
+Fixes: 0c4dcd602817 ("RDMA/bnxt_re: Refactor hardware queue memory allocation")
+Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
+Link: https://lore.kernel.org/r/20240507103929.30003-1-mschmidt@redhat.com
+Acked-by: Selvin Xavier <selvin.xavier@broadcom.com>
+Signed-off-by: Leon Romanovsky <leon@kernel.org>
+Signed-off-by: Sasha Levin <sashal@kernel.org>
+Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
+Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
+(cherry picked from commit 949beca2d9ddb69c2ccd39e5fd5d062c81fe0db0)
+Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
+---
+ drivers/infiniband/hw/bnxt_re/qplib_fp.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+index 439d0c7c5d0c..04258676d072 100644
+--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
++++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+@@ -1013,7 +1013,8 @@ int bnxt_qplib_create_qp(struct bnxt_qplib_res *res, struct bnxt_qplib_qp *qp)
+ 	hwq_attr.stride = sizeof(struct sq_sge);
+ 	hwq_attr.depth = bnxt_qplib_get_depth(sq);
+ 	hwq_attr.aux_stride = psn_sz;
+-	hwq_attr.aux_depth = bnxt_qplib_set_sq_size(sq, qp->wqe_mode);
++	hwq_attr.aux_depth = psn_sz ? bnxt_qplib_set_sq_size(sq, qp->wqe_mode)
++				    : 0;
+ 	/* Update msn tbl size */
+ 	if (BNXT_RE_HW_RETX(qp->dev_cap_flags) && psn_sz) {
+ 		hwq_attr.aux_depth = roundup_pow_of_two(bnxt_qplib_set_sq_size(sq, qp->wqe_mode));
-- 
2.39.2



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