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bpf, x64: Fix tailcall infinite loop caused by freplace
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This patch fixes a tailcall infinite loop issue caused by freplace.

Since commit 1c123c5 ("bpf: Resolve fext program type when checking map compatibility"),
freplace prog is allowed to tail call its target prog. Then, when a
freplace prog attaches to its target prog's subprog and tail calls its
target prog, kernel will panic.

For example:

tc_bpf2bpf.c:

// SPDX-License-Identifier: GPL-2.0
\#include <linux/bpf.h>
\#include <bpf/bpf_helpers.h>

__noinline
int subprog_tc(struct __sk_buff *skb)
{
	return skb->len * 2;
}

SEC("tc")
int entry_tc(struct __sk_buff *skb)
{
	return subprog_tc(skb);
}

char __license[] SEC("license") = "GPL";

tailcall_bpf2bpf_hierarchy_freplace.c:

// SPDX-License-Identifier: GPL-2.0
\#include <linux/bpf.h>
\#include <bpf/bpf_helpers.h>

struct {
	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
	__uint(max_entries, 1);
	__uint(key_size, sizeof(__u32));
	__uint(value_size, sizeof(__u32));
} jmp_table SEC(".maps");

int count = 0;

static __noinline
int subprog_tail(struct __sk_buff *skb)
{
	bpf_tail_call_static(skb, &jmp_table, 0);
	return 0;
}

SEC("freplace")
int entry_freplace(struct __sk_buff *skb)
{
	count++;
	subprog_tail(skb);
	subprog_tail(skb);
	return count;
}

char __license[] SEC("license") = "GPL";

The attach target of entry_freplace is subprog_tc, and the tail callee
in subprog_tail is entry_tc.

Then, the infinite loop will be entry_tc -> subprog_tc -> entry_freplace
-> subprog_tail --tailcall-> entry_tc, because tail_call_cnt in
entry_freplace will count from zero for every time of entry_freplace
execution. Kernel will panic:

[   15.310490] BUG: TASK stack guard page was hit at (____ptrval____)
(stack is (____ptrval____)..(____ptrval____))
[   15.310490] Oops: stack guard page: 0000 [#1] PREEMPT SMP NOPTI
[   15.310490] CPU: 1 PID: 89 Comm: test_progs Tainted: G           OE
   6.10.0-rc6-g026dcdae8d3e-dirty torvalds#72
[   15.310490] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX,
1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.310490] RIP: 0010:bpf_prog_3a140cef239a4b4f_subprog_tail+0x14/0x53
[   15.310490] Code: cc cc cc cc cc cc 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 0f 1f 00 55 48 89 e5 f3 0f 1e
fa <50> 50 53 41 55 48 89 fb 49 bd 00 2a 46 82 98 9c ff ff 48 89 df 4c
[   15.310490] RSP: 0018:ffffb500c0aa0000 EFLAGS: 00000202
[   15.310490] RAX: ffffb500c0aa0028 RBX: ffff9c98808b7e00 RCX:
0000000000008cb5
[   15.310490] RDX: 0000000000000000 RSI: ffff9c9882462a00 RDI:
ffff9c98808b7e00
[   15.310490] RBP: ffffb500c0aa0000 R08: 0000000000000000 R09:
0000000000000000
[   15.310490] R10: 0000000000000001 R11: 0000000000000000 R12:
ffffb500c01af000
[   15.310490] R13: ffffb500c01cd000 R14: 0000000000000000 R15:
0000000000000000
[   15.310490] FS:  00007f133b665140(0000) GS:ffff9c98bbd00000(0000)
knlGS:0000000000000000
[   15.310490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.310490] CR2: ffffb500c0a9fff8 CR3: 0000000102478000 CR4:
00000000000006f0
[   15.310490] Call Trace:
[   15.310490]  <#DF>
[   15.310490]  ? die+0x36/0x90
[   15.310490]  ? handle_stack_overflow+0x4d/0x60
[   15.310490]  ? exc_double_fault+0x117/0x1a0
[   15.310490]  ? asm_exc_double_fault+0x23/0x30
[   15.310490]  ? bpf_prog_3a140cef239a4b4f_subprog_tail+0x14/0x53
[   15.310490]  </#DF>
[   15.310490]  <TASK>
[   15.310490]  bpf_prog_85781a698094722f_entry+0x4c/0x64
[   15.310490]  bpf_prog_1c515f389a9059b4_entry2+0x19/0x1b
[   15.310490]  ...
[   15.310490]  bpf_prog_85781a698094722f_entry+0x4c/0x64
[   15.310490]  bpf_prog_1c515f389a9059b4_entry2+0x19/0x1b
[   15.310490]  bpf_test_run+0x210/0x370
[   15.310490]  ? bpf_test_run+0x128/0x370
[   15.310490]  bpf_prog_test_run_skb+0x388/0x7a0
[   15.310490]  __sys_bpf+0xdbf/0x2c40
[   15.310490]  ? clockevents_program_event+0x52/0xf0
[   15.310490]  ? lock_release+0xbf/0x290
[   15.310490]  __x64_sys_bpf+0x1e/0x30
[   15.310490]  do_syscall_64+0x68/0x140
[   15.310490]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[   15.310490] RIP: 0033:0x7f133b52725d
[   15.310490] 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 8b bb 0d 00 f7 d8 64 89 01 48
[   15.310490] RSP: 002b:00007ffddbc10258 EFLAGS: 00000206 ORIG_RAX:
0000000000000141
[   15.310490] RAX: ffffffffffffffda RBX: 00007ffddbc10828 RCX:
00007f133b52725d
[   15.310490] RDX: 0000000000000050 RSI: 00007ffddbc102a0 RDI:
000000000000000a
[   15.310490] RBP: 00007ffddbc10270 R08: 0000000000000000 R09:
00007ffddbc102a0
[   15.310490] R10: 0000000000000064 R11: 0000000000000206 R12:
0000000000000004
[   15.310490] R13: 0000000000000000 R14: 0000558ec4c24890 R15:
00007f133b6ed000
[   15.310490]  </TASK>
[   15.310490] Modules linked in: bpf_testmod(OE)
[   15.310490] ---[ end trace 0000000000000000 ]---
[   15.310490] RIP: 0010:bpf_prog_3a140cef239a4b4f_subprog_tail+0x14/0x53
[   15.310490] Code: cc cc cc cc cc cc 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 0f 1f 00 55 48 89 e5 f3 0f 1e
fa <50> 50 53 41 55 48 89 fb 49 bd 00 2a 46 82 98 9c ff ff 48 89 df 4c
[   15.310490] RSP: 0018:ffffb500c0aa0000 EFLAGS: 00000202
[   15.310490] RAX: ffffb500c0aa0028 RBX: ffff9c98808b7e00 RCX:
0000000000008cb5
[   15.310490] RDX: 0000000000000000 RSI: ffff9c9882462a00 RDI:
ffff9c98808b7e00
[   15.310490] RBP: ffffb500c0aa0000 R08: 0000000000000000 R09:
0000000000000000
[   15.310490] R10: 0000000000000001 R11: 0000000000000000 R12:
ffffb500c01af000
[   15.310490] R13: ffffb500c01cd000 R14: 0000000000000000 R15:
0000000000000000
[   15.310490] FS:  00007f133b665140(0000) GS:ffff9c98bbd00000(0000)
knlGS:0000000000000000
[   15.310490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.310490] CR2: ffffb500c0a9fff8 CR3: 0000000102478000 CR4:
00000000000006f0
[   15.310490] Kernel panic - not syncing: Fatal exception in interrupt
[   15.310490] Kernel Offset: 0x30000000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)

This patch fixes the issue by initializing tail_call_cnt at the prologue
of entry_tc.

Next, when call subprog_tc, the tail_call_cnt_ptr is propagated to
subprog_tc by rax.
Next, when jump to entry_freplace, the tail_call_cnt_ptr will be reused to
count tailcall in freplace prog.
Next, when call subprog_tail, the tail_call_cnt_ptr is propagated to
subprog_tail by rax.
Next, while tail calling to entry_tc, the tail_call_cnt on the stack of
entry_tc increments via the tail_call_cnt_ptr.

The whole procedure shows as the following JITed prog dumping.

bpftool p d j n entry_tc:

int entry_tc(struct __sk_buff * skb):
bpf_prog_1c515f389a9059b4_entry_tc:
; return subprog_tc(skb);
   0:	endbr64
   4:	xorq	%rax, %rax		;; rax = 0 (tail_call_cnt)
   7:	nopl	(%rax,%rax)
   c:	pushq	%rbp
   d:	movq	%rsp, %rbp
  10:	endbr64
  14:	cmpq	$33, %rax		;; if rax > 33, rax = tcc_ptr
  18:	ja	0x20			;; if rax > 33 goto 0x20 ---+
  1a:	pushq	%rax			;; [rbp - 8] = rax = 0      |
  1b:	movq	%rsp, %rax		;; rax = rbp - 8            |
  1e:	jmp	0x21			;; ---------+               |
  20:	pushq	%rax			;; <--------|---------------+
  21:	pushq	%rax			;; <--------+ [rbp - 16] = rax
  22:	movq	-16(%rbp), %rax		;; rax = tcc_ptr
  29:	callq	0x70			;; call subprog_tc()
; return subprog_tc(skb);
  2e:	leave
  2f:	retq

int subprog_tc(struct __sk_buff * skb):
bpf_prog_1e8f76e2374a0607_subprog_tc:
; return skb->len * 2;
   0:	endbr64
   4:	nopl	(%rax)			;; do not touch tail_call_cnt
   7:	jmp	0x108			;; jump to entry_freplace()
   c:	pushq	%rbp
   d:	movq	%rsp, %rbp
  10:	endbr64
  14:	pushq	%rax
  15:	pushq	%rax
  16:	movl	112(%rdi), %eax
; return skb->len * 2;
  19:	shll	%eax
; return skb->len * 2;
  1b:	leave
  1c:	retq

bpftool p d j n entry_freplace:

int entry_freplace(struct __sk_buff * skb):
bpf_prog_85781a698094722f_entry_freplace:
; int entry_freplace(struct __sk_buff *skb)
   0:	endbr64
   4:	nopl	(%rax)			;; do not touch tail_call_cnt
   7:	nopl	(%rax,%rax)
   c:	pushq	%rbp
   d:	movq	%rsp, %rbp
  10:	endbr64
  14:	cmpq	$33, %rax		;; if rax > 33, rax = tcc_ptr
  18:	ja	0x20			;; if rax > 33 goto 0x20 ---+
  1a:	pushq	%rax			;; [rbp - 8] = rax = 0      |
  1b:	movq	%rsp, %rax		;; rax = rbp - 8            |
  1e:	jmp	0x21			;; ---------+               |
  20:	pushq	%rax			;; <--------|---------------+
  21:	pushq	%rax			;; <--------+ [rbp - 16] = rax
  22:	pushq	%rbx			;; callee saved
  23:	pushq	%r13			;; callee saved
  25:	movq	%rdi, %rbx		;; rbx = skb (callee saved)
; count++;
  28:	movabsq	$-123406219759616, %r13
  32:	movl	(%r13), %edi
  36:	addl	$1, %edi
  39:	movl	%edi, (%r13)
; subprog_tail(skb);
  3d:	movq	%rbx, %rdi		;; rdi = skb
  40:	movq	-16(%rbp), %rax		;; rax = tcc_ptr
  47:	callq	0x80			;; call subprog_tail()
; subprog_tail(skb);
  4c:	movq	%rbx, %rdi		;; rdi = skb
  4f:	movq	-16(%rbp), %rax		;; rax = tcc_ptr
  56:	callq	0x80			;; call subprog_tail()
; return count;
  5b:	movl	(%r13), %eax
; return count;
  5f:	popq	%r13
  61:	popq	%rbx
  62:	leave
  63:	retq

int subprog_tail(struct __sk_buff * skb):
bpf_prog_3a140cef239a4b4f_subprog_tail:
; int subprog_tail(struct __sk_buff *skb)
   0:	endbr64
   4:	nopl	(%rax)			;; do not touch tail_call_cnt
   7:	nopl	(%rax,%rax)
   c:	pushq	%rbp
   d:	movq	%rsp, %rbp
  10:	endbr64
  14:	pushq	%rax			;; [rbp - 8]  = rax (tcc_ptr)
  15:	pushq	%rax			;; [rbp - 16] = rax (tcc_ptr)
  16:	pushq	%rbx			;; callee saved
  17:	pushq	%r13			;; callee saved
  19:	movq	%rdi, %rbx		;; rbx = skb
; asm volatile("r1 = %[ctx]\n\t"
  1c:	movabsq	$-128494642337280, %r13	;; r13 = jmp_table
  26:	movq	%rbx, %rdi		;; 1st arg, skb
  29:	movq	%r13, %rsi		;; 2nd arg, jmp_table
  2c:	xorl	%edx, %edx		;; 3rd arg, index = 0
  2e:	movq	-16(%rbp), %rax		;; rax = [rbp - 16] (tcc_ptr)
  35:	cmpq	$33, (%rax)
  39:	jae	0x4e			;; if *tcc_ptr >= 33 goto 0x4e --------+
  3b:	nopl	(%rax,%rax)		;; jmp bypass, toggled by poking       |
  40:	addq	$1, (%rax)		;; (*tcc_ptr)++                        |
  44:	popq	%r13			;; callee saved                        |
  46:	popq	%rbx			;; callee saved                        |
  47:	popq	%rax			;; undo rbp-16 push                    |
  48:	popq	%rax			;; undo rbp-8  push                    |
  49:	jmp	0xfffffffffffffe18	;; tail call target, toggled by poking |
; return 0;				;;                                     |
  4e:	popq	%r13			;; restore callee saved <--------------+
  50:	popq	%rbx			;; restore callee saved
  51:	leave
  52:	retq

As a result, the tail_call_cnt is stored on the stack of entry_tc. And
the tail_call_cnt_ptr is propagated between subprog_tc, entry_freplace,
subprog_tail and entry_tc.

Furthermore, trampoline is required to propagate
tail_call_cnt/tail_call_cnt_ptr always, no matter whether there is
tailcall at run time.
So, it reuses trampoline flag "BIT(7)" to tell trampoline to propagate
the tail_call_cnt/tail_call_cnt_ptr, as BPF_TRAMP_F_TAIL_CALL_CTX is not
used by any other arch BPF JIT.

However, the bad effect is that it requires initializing tail_call_cnt at
prologue always no matter whether the prog is tail_call_reachable, because
it is unable to confirm itself or its subprog[s] whether to be attached by
freplace prog.
And, when call subprog, tail_call_cnt_ptr is required to be propagated
to subprog always.

Fixes: 1c123c5 ("bpf: Resolve fext program type when checking map compatibility")
Signed-off-by: Leon Hwang <[email protected]>
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@Asphaltt @intel-lab-lkp
Asphaltt authored and intel-lab-lkp committed Aug 26, 2024
1 parent ddc3d98 commit e8c52dd
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Showing 4 changed files with 32 additions and 26 deletions.
44 changes: 25 additions & 19 deletions arch/x86/net/bpf_jit_comp.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -274,6 +274,8 @@ struct jit_context {
#define X86_PATCH_SIZE 5
/* Number of bytes that will be skipped on tailcall */
#define X86_TAIL_CALL_OFFSET (12 + ENDBR_INSN_SIZE)
/* Number of extra bytes that will be skipped on poke */
#define X86_POKE_EXTRA 3

static void push_r12(u8 **pprog)
{
Expand Down Expand Up @@ -440,18 +442,14 @@ static void emit_prologue_tail_call(u8 **pprog, bool is_subprog)
* while jumping to another program
*/
static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf,
bool tail_call_reachable, bool is_subprog,
bool is_extension, bool is_subprog,
bool is_exception_cb)
{
u8 *prog = *pprog;

emit_cfi(&prog, is_subprog ? cfi_bpf_subprog_hash : cfi_bpf_hash);
/* BPF trampoline can be made to work without these nops,
* but let's waste 5 bytes for now and optimize later
*/
emit_nops(&prog, X86_PATCH_SIZE);
if (!ebpf_from_cbpf) {
if (tail_call_reachable && !is_subprog)
if (!is_extension && !is_subprog)
/* When it's the entry of the whole tailcall context,
* zeroing rax means initialising tail_call_cnt.
*/
Expand All @@ -460,6 +458,10 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf,
/* Keep the same instruction layout. */
emit_nops(&prog, 3); /* nop3 */
}
/* BPF trampoline can be made to work without these nops,
* but let's waste 5 bytes for now and optimize later
*/
emit_nops(&prog, X86_PATCH_SIZE);
/* Exception callback receives FP as third parameter */
if (is_exception_cb) {
EMIT3(0x48, 0x89, 0xF4); /* mov rsp, rsi */
Expand All @@ -483,7 +485,7 @@ static void emit_prologue(u8 **pprog, u32 stack_depth, bool ebpf_from_cbpf,
/* sub rsp, rounded_stack_depth */
if (stack_depth)
EMIT3_off32(0x48, 0x81, 0xEC, round_up(stack_depth, 8));
if (tail_call_reachable)
if (!ebpf_from_cbpf)
emit_prologue_tail_call(&prog, is_subprog);
*pprog = prog;
}
Expand Down Expand Up @@ -573,10 +575,13 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,

/*
* See emit_prologue(), for IBT builds the trampoline hook is preceded
* with an ENDBR instruction.
* with an ENDBR instruction and 3 bytes tail_call_cnt initialization
* instruction.
*/
if (is_endbr(*(u32 *)ip))
ip += ENDBR_INSN_SIZE;
if (is_bpf_text_address((long)ip))
ip += X86_POKE_EXTRA;

return __bpf_arch_text_poke(ip, t, old_addr, new_addr);
}
Expand Down Expand Up @@ -1365,7 +1370,7 @@ static void emit_shiftx(u8 **pprog, u32 dst_reg, u8 src_reg, bool is64, u8 op)
static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image,
int oldproglen, struct jit_context *ctx, bool jmp_padding)
{
bool tail_call_reachable = bpf_prog->aux->tail_call_reachable;
bool is_extension = bpf_prog->type == BPF_PROG_TYPE_EXT;
struct bpf_insn *insn = bpf_prog->insnsi;
bool callee_regs_used[4] = {};
int insn_cnt = bpf_prog->len;
Expand All @@ -1383,7 +1388,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image, u8 *rw_image
detect_reg_usage(insn, insn_cnt, callee_regs_used);

emit_prologue(&prog, bpf_prog->aux->stack_depth,
bpf_prog_was_classic(bpf_prog), tail_call_reachable,
bpf_prog_was_classic(bpf_prog), is_extension,
bpf_is_subprog(bpf_prog), bpf_prog->aux->exception_cb);
/* Exception callback will clobber callee regs for its own use, and
* restore the original callee regs from main prog's stack frame.
Expand Down Expand Up @@ -2077,10 +2082,8 @@ st: if (is_imm8(insn->off))
u8 *ip = image + addrs[i - 1];

func = (u8 *) __bpf_call_base + imm32;
if (tail_call_reachable) {
LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
ip += 7;
}
LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
ip += 7;
if (!imm32)
return -EINVAL;
ip += x86_call_depth_emit_accounting(&prog, func, ip);
Expand Down Expand Up @@ -2877,7 +2880,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
* [ ... ]
* [ stack_arg2 ]
* RBP - arg_stack_off [ stack_arg1 ]
* RSP [ tail_call_cnt_ptr ] BPF_TRAMP_F_TAIL_CALL_CTX
* RSP [ tail_call_cnt_ptr ] BPF_TRAMP_F_TAIL_CALL
*/

/* room for return value of orig_call or fentry prog */
Expand Down Expand Up @@ -2923,6 +2926,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
*/
if (is_endbr(*(u32 *)orig_call))
orig_call += ENDBR_INSN_SIZE;
if (is_bpf_text_address((long)orig_call))
orig_call += X86_POKE_EXTRA;
orig_call += X86_PATCH_SIZE;
}

Expand All @@ -2949,8 +2954,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
/* sub rsp, stack_size */
EMIT4(0x48, 0x83, 0xEC, stack_size);
}
if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
EMIT1(0x50); /* push rax */
if (flags & BPF_TRAMP_F_TAIL_CALL)
EMIT1(0x50); /* push rax */
/* mov QWORD PTR [rbp - rbx_off], rbx */
emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_6, -rbx_off);

Expand Down Expand Up @@ -3005,7 +3010,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
restore_regs(m, &prog, regs_off);
save_args(m, &prog, arg_stack_off, true);

if (flags & BPF_TRAMP_F_TAIL_CALL_CTX) {
if (flags & BPF_TRAMP_F_TAIL_CALL) {
/* Before calling the original function, load the
* tail_call_cnt_ptr from stack to rax.
*/
Expand All @@ -3025,6 +3030,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
/* remember return value in a stack for bpf prog to access */
emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -8);
im->ip_after_call = image + (prog - (u8 *)rw_image);
emit_nops(&prog, X86_POKE_EXTRA);
emit_nops(&prog, X86_PATCH_SIZE);
}

Expand Down Expand Up @@ -3067,7 +3073,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im
ret = -EINVAL;
goto cleanup;
}
} else if (flags & BPF_TRAMP_F_TAIL_CALL_CTX) {
} else if (flags & BPF_TRAMP_F_TAIL_CALL) {
/* Before running the original function, load the
* tail_call_cnt_ptr from stack to rax.
*/
Expand Down
6 changes: 3 additions & 3 deletions include/linux/bpf.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1074,10 +1074,10 @@ struct btf_func_model {
*/
#define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)

/* Indicate that current trampoline is in a tail call context. Then, it has to
* cache and restore tail_call_cnt to avoid infinite tail call loop.
/* Indicate that current trampoline is required to cache and restore
* tail_call_cnt or tail_call_cnt_ptr to avoid infinite tail call loop.
*/
#define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
#define BPF_TRAMP_F_TAIL_CALL BIT(7)

/*
* Indicate the trampoline should be suitable to receive indirect calls;
Expand Down
4 changes: 2 additions & 2 deletions kernel/bpf/trampoline.c
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Original file line number Diff line number Diff line change
Expand Up @@ -409,8 +409,8 @@ static int bpf_trampoline_update(struct bpf_trampoline *tr, bool lock_direct_mut
goto out;
}

/* clear all bits except SHARE_IPMODIFY and TAIL_CALL_CTX */
tr->flags &= (BPF_TRAMP_F_SHARE_IPMODIFY | BPF_TRAMP_F_TAIL_CALL_CTX);
/* clear all bits except SHARE_IPMODIFY and TAIL_CALL */
tr->flags &= (BPF_TRAMP_F_SHARE_IPMODIFY | BPF_TRAMP_F_TAIL_CALL);

if (tlinks[BPF_TRAMP_FEXIT].nr_links ||
tlinks[BPF_TRAMP_MODIFY_RETURN].nr_links) {
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4 changes: 2 additions & 2 deletions kernel/bpf/verifier.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22112,8 +22112,8 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
if (!tr)
return -ENOMEM;

if (tgt_prog && tgt_prog->aux->tail_call_reachable)
tr->flags = BPF_TRAMP_F_TAIL_CALL_CTX;
if (tgt_prog)
tr->flags = BPF_TRAMP_F_TAIL_CALL;

prog->aux->dst_trampoline = tr;
return 0;
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