[gentoo-commits] proj/linux-patches:5.12 commit in: /

["Alice Ferrazzi" <alicef@gentoo.org>]

commit:     e6d9be74b3e7338b6962aabb831d42f3b594f44f
Author:     Alice Ferrazzi <alicef <AT> gentoo <DOT> org>
AuthorDate: Fri May 28 12:17:14 2021 +0000
Commit:     Alice Ferrazzi <alicef <AT> gentoo <DOT> org>
CommitDate: Fri May 28 12:17:25 2021 +0000
URL:        https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=e6d9be74

Linux patch 5.12.8

Signed-off-by: Alice Ferrazzi <alicef <AT> gentoo.org>

 0000_README             |   4 +
 1007_linux-5.12.8.patch | 288 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 292 insertions(+)

diff --git a/0000_README b/0000_README
index 22c40ca..90784e9 100644
--- a/0000_README
+++ b/0000_README
@@ -71,6 +71,10 @@ Patch:  1006_linux-5.12.7.patch
 From:   http://www.kernel.org
 Desc:   Linux 5.12.7
 
+Patch:  1007_linux-5.12.8.patch
+From:   http://www.kernel.org
+Desc:   Linux 5.12.8
+
 Patch:  1500_XATTR_USER_PREFIX.patch
 From:   https://bugs.gentoo.org/show_bug.cgi?id=470644
 Desc:   Support for namespace user.pax.* on tmpfs.

diff --git a/1007_linux-5.12.8.patch b/1007_linux-5.12.8.patch
new file mode 100644
index 0000000..1cfbe69
--- /dev/null
+++ b/1007_linux-5.12.8.patch
@@ -0,0 +1,288 @@
+diff --git a/Makefile b/Makefile
+index 6a73dee7c2219..a20afcb7d2bf4 100644
+--- a/Makefile
++++ b/Makefile
+@@ -1,7 +1,7 @@
+ # SPDX-License-Identifier: GPL-2.0
+ VERSION = 5
+ PATCHLEVEL = 12
+-SUBLEVEL = 7
++SUBLEVEL = 8
+ EXTRAVERSION =
+ NAME = Frozen Wasteland
+ 
+diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
+index 48ee3deab64b1..9a6825feaf53f 100644
+--- a/arch/x86/kvm/svm/svm.c
++++ b/arch/x86/kvm/svm/svm.c
+@@ -3815,15 +3815,15 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu,
+ 	 * have them in state 'on' as recorded before entering guest mode.
+ 	 * Same as enter_from_user_mode().
+ 	 *
+-	 * guest_exit_irqoff() restores host context and reinstates RCU if
+-	 * enabled and required.
++	 * context_tracking_guest_exit() restores host context and reinstates
++	 * RCU if enabled and required.
+ 	 *
+ 	 * This needs to be done before the below as native_read_msr()
+ 	 * contains a tracepoint and x86_spec_ctrl_restore_host() calls
+ 	 * into world and some more.
+ 	 */
+ 	lockdep_hardirqs_off(CALLER_ADDR0);
+-	guest_exit_irqoff();
++	context_tracking_guest_exit();
+ 
+ 	instrumentation_begin();
+ 	trace_hardirqs_off_finish();
+diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
+index f68ed9a1abcc9..ae63d59be38c7 100644
+--- a/arch/x86/kvm/vmx/vmx.c
++++ b/arch/x86/kvm/vmx/vmx.c
+@@ -6701,15 +6701,15 @@ static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu,
+ 	 * have them in state 'on' as recorded before entering guest mode.
+ 	 * Same as enter_from_user_mode().
+ 	 *
+-	 * guest_exit_irqoff() restores host context and reinstates RCU if
+-	 * enabled and required.
++	 * context_tracking_guest_exit() restores host context and reinstates
++	 * RCU if enabled and required.
+ 	 *
+ 	 * This needs to be done before the below as native_read_msr()
+ 	 * contains a tracepoint and x86_spec_ctrl_restore_host() calls
+ 	 * into world and some more.
+ 	 */
+ 	lockdep_hardirqs_off(CALLER_ADDR0);
+-	guest_exit_irqoff();
++	context_tracking_guest_exit();
+ 
+ 	instrumentation_begin();
+ 	trace_hardirqs_off_finish();
+diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
+index 87311d39f9145..86678f8b35020 100644
+--- a/arch/x86/kvm/x86.c
++++ b/arch/x86/kvm/x86.c
+@@ -9236,6 +9236,15 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
+ 	local_irq_disable();
+ 	kvm_after_interrupt(vcpu);
+ 
++	/*
++	 * Wait until after servicing IRQs to account guest time so that any
++	 * ticks that occurred while running the guest are properly accounted
++	 * to the guest.  Waiting until IRQs are enabled degrades the accuracy
++	 * of accounting via context tracking, but the loss of accuracy is
++	 * acceptable for all known use cases.
++	 */
++	vtime_account_guest_exit();
++
+ 	if (lapic_in_kernel(vcpu)) {
+ 		s64 delta = vcpu->arch.apic->lapic_timer.advance_expire_delta;
+ 		if (delta != S64_MIN) {
+diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
+index bceb064985214..4f4556232dcf7 100644
+--- a/include/linux/context_tracking.h
++++ b/include/linux/context_tracking.h
+@@ -131,16 +131,26 @@ static __always_inline void guest_enter_irqoff(void)
+ 	}
+ }
+ 
+-static __always_inline void guest_exit_irqoff(void)
++static __always_inline void context_tracking_guest_exit(void)
+ {
+ 	if (context_tracking_enabled())
+ 		__context_tracking_exit(CONTEXT_GUEST);
++}
+ 
+-	instrumentation_begin();
++static __always_inline void vtime_account_guest_exit(void)
++{
+ 	if (vtime_accounting_enabled_this_cpu())
+ 		vtime_guest_exit(current);
+ 	else
+ 		current->flags &= ~PF_VCPU;
++}
++
++static __always_inline void guest_exit_irqoff(void)
++{
++	context_tracking_guest_exit();
++
++	instrumentation_begin();
++	vtime_account_guest_exit();
+ 	instrumentation_end();
+ }
+ 
+@@ -159,12 +169,19 @@ static __always_inline void guest_enter_irqoff(void)
+ 	instrumentation_end();
+ }
+ 
++static __always_inline void context_tracking_guest_exit(void) { }
++
++static __always_inline void vtime_account_guest_exit(void)
++{
++	vtime_account_kernel(current);
++	current->flags &= ~PF_VCPU;
++}
++
+ static __always_inline void guest_exit_irqoff(void)
+ {
+ 	instrumentation_begin();
+ 	/* Flush the guest cputime we spent on the guest */
+-	vtime_account_kernel(current);
+-	current->flags &= ~PF_VCPU;
++	vtime_account_guest_exit();
+ 	instrumentation_end();
+ }
+ #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
+diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
+index 43c9c5d2bedbd..33979017b7824 100644
+--- a/include/net/nfc/nci_core.h
++++ b/include/net/nfc/nci_core.h
+@@ -298,6 +298,7 @@ int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
+ 		      struct sk_buff **resp);
+ 
+ struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev);
++void nci_hci_deallocate(struct nci_dev *ndev);
+ int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
+ 		       const u8 *param, size_t param_len);
+ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate,
+diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
+index 7fa6fc6bedf1f..21247e49fe82b 100644
+--- a/kernel/bpf/verifier.c
++++ b/kernel/bpf/verifier.c
+@@ -5863,18 +5863,10 @@ enum {
+ };
+ 
+ static int retrieve_ptr_limit(const struct bpf_reg_state *ptr_reg,
+-			      const struct bpf_reg_state *off_reg,
+-			      u32 *alu_limit, u8 opcode)
++			      u32 *alu_limit, bool mask_to_left)
+ {
+-	bool off_is_neg = off_reg->smin_value < 0;
+-	bool mask_to_left = (opcode == BPF_ADD &&  off_is_neg) ||
+-			    (opcode == BPF_SUB && !off_is_neg);
+ 	u32 max = 0, ptr_limit = 0;
+ 
+-	if (!tnum_is_const(off_reg->var_off) &&
+-	    (off_reg->smin_value < 0) != (off_reg->smax_value < 0))
+-		return REASON_BOUNDS;
+-
+ 	switch (ptr_reg->type) {
+ 	case PTR_TO_STACK:
+ 		/* Offset 0 is out-of-bounds, but acceptable start for the
+@@ -5940,15 +5932,20 @@ static bool sanitize_needed(u8 opcode)
+ 	return opcode == BPF_ADD || opcode == BPF_SUB;
+ }
+ 
++struct bpf_sanitize_info {
++	struct bpf_insn_aux_data aux;
++	bool mask_to_left;
++};
++
+ static int sanitize_ptr_alu(struct bpf_verifier_env *env,
+ 			    struct bpf_insn *insn,
+ 			    const struct bpf_reg_state *ptr_reg,
+ 			    const struct bpf_reg_state *off_reg,
+ 			    struct bpf_reg_state *dst_reg,
+-			    struct bpf_insn_aux_data *tmp_aux,
++			    struct bpf_sanitize_info *info,
+ 			    const bool commit_window)
+ {
+-	struct bpf_insn_aux_data *aux = commit_window ? cur_aux(env) : tmp_aux;
++	struct bpf_insn_aux_data *aux = commit_window ? cur_aux(env) : &info->aux;
+ 	struct bpf_verifier_state *vstate = env->cur_state;
+ 	bool off_is_imm = tnum_is_const(off_reg->var_off);
+ 	bool off_is_neg = off_reg->smin_value < 0;
+@@ -5969,7 +5966,16 @@ static int sanitize_ptr_alu(struct bpf_verifier_env *env,
+ 	if (vstate->speculative)
+ 		goto do_sim;
+ 
+-	err = retrieve_ptr_limit(ptr_reg, off_reg, &alu_limit, opcode);
++	if (!commit_window) {
++		if (!tnum_is_const(off_reg->var_off) &&
++		    (off_reg->smin_value < 0) != (off_reg->smax_value < 0))
++			return REASON_BOUNDS;
++
++		info->mask_to_left = (opcode == BPF_ADD &&  off_is_neg) ||
++				     (opcode == BPF_SUB && !off_is_neg);
++	}
++
++	err = retrieve_ptr_limit(ptr_reg, &alu_limit, info->mask_to_left);
+ 	if (err < 0)
+ 		return err;
+ 
+@@ -5977,8 +5983,8 @@ static int sanitize_ptr_alu(struct bpf_verifier_env *env,
+ 		/* In commit phase we narrow the masking window based on
+ 		 * the observed pointer move after the simulated operation.
+ 		 */
+-		alu_state = tmp_aux->alu_state;
+-		alu_limit = abs(tmp_aux->alu_limit - alu_limit);
++		alu_state = info->aux.alu_state;
++		alu_limit = abs(info->aux.alu_limit - alu_limit);
+ 	} else {
+ 		alu_state  = off_is_neg ? BPF_ALU_NEG_VALUE : 0;
+ 		alu_state |= off_is_imm ? BPF_ALU_IMMEDIATE : 0;
+@@ -5993,8 +5999,12 @@ do_sim:
+ 	/* If we're in commit phase, we're done here given we already
+ 	 * pushed the truncated dst_reg into the speculative verification
+ 	 * stack.
++	 *
++	 * Also, when register is a known constant, we rewrite register-based
++	 * operation to immediate-based, and thus do not need masking (and as
++	 * a consequence, do not need to simulate the zero-truncation either).
+ 	 */
+-	if (commit_window)
++	if (commit_window || off_is_imm)
+ 		return 0;
+ 
+ 	/* Simulate and find potential out-of-bounds access under
+@@ -6139,7 +6149,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
+ 	    smin_ptr = ptr_reg->smin_value, smax_ptr = ptr_reg->smax_value;
+ 	u64 umin_val = off_reg->umin_value, umax_val = off_reg->umax_value,
+ 	    umin_ptr = ptr_reg->umin_value, umax_ptr = ptr_reg->umax_value;
+-	struct bpf_insn_aux_data tmp_aux = {};
++	struct bpf_sanitize_info info = {};
+ 	u8 opcode = BPF_OP(insn->code);
+ 	u32 dst = insn->dst_reg;
+ 	int ret;
+@@ -6208,7 +6218,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
+ 
+ 	if (sanitize_needed(opcode)) {
+ 		ret = sanitize_ptr_alu(env, insn, ptr_reg, off_reg, dst_reg,
+-				       &tmp_aux, false);
++				       &info, false);
+ 		if (ret < 0)
+ 			return sanitize_err(env, insn, ret, off_reg, dst_reg);
+ 	}
+@@ -6349,7 +6359,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env,
+ 		return -EACCES;
+ 	if (sanitize_needed(opcode)) {
+ 		ret = sanitize_ptr_alu(env, insn, dst_reg, off_reg, dst_reg,
+-				       &tmp_aux, true);
++				       &info, true);
+ 		if (ret < 0)
+ 			return sanitize_err(env, insn, ret, off_reg, dst_reg);
+ 	}
+diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
+index 59257400697d1..142d71c8d6521 100644
+--- a/net/nfc/nci/core.c
++++ b/net/nfc/nci/core.c
+@@ -1191,6 +1191,7 @@ EXPORT_SYMBOL(nci_allocate_device);
+ void nci_free_device(struct nci_dev *ndev)
+ {
+ 	nfc_free_device(ndev->nfc_dev);
++	nci_hci_deallocate(ndev);
+ 	kfree(ndev);
+ }
+ EXPORT_SYMBOL(nci_free_device);
+diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
+index 6b275a387a92a..96865142104f4 100644
+--- a/net/nfc/nci/hci.c
++++ b/net/nfc/nci/hci.c
+@@ -792,3 +792,8 @@ struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
+ 
+ 	return hdev;
+ }
++
++void nci_hci_deallocate(struct nci_dev *ndev)
++{
++	kfree(ndev->hci_dev);
++}