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fprobes and fprobe events implementation from Codasip #19

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b881363
tracing: fprobe: do not zero out unused fgraph_data
martin-kaiser Mar 16, 2026
5f3b9ef
trace: replace hand coded DIV_ROUND_UP
martin-kaiser Mar 16, 2026
993d6ec
cheri: trace: fgraph: correct mapping of reserved data to stack words
martin-kaiser Mar 13, 2026
d323280
fprobe: don't use packed fprobe header for cheri
martin-kaiser Mar 23, 2026
0662f32
fprobe: update the code for cheri
martin-kaiser Mar 16, 2026
5ae0037
lib: test_fprobe: fix two clang-tidy warnings
martin-kaiser Mar 24, 2026
694bbab
qemu_riscv64cheripc_defconfig: enable fprobes
martin-kaiser Mar 24, 2026
c81be47
fprobe_example: update the module for cheri
martin-kaiser Mar 16, 2026
4ef73bd
trace_probe: squelch a clang-tidy warning
martin-kaiser Mar 31, 2026
c26bc6c
tracing/probes: fix oob write in fetch_store_symstring
martin-kaiser Mar 31, 2026
a3da753
trace_fprobe: update for cheri
martin-kaiser Mar 31, 2026
1932c85
trace_uprobe: update two function declarations
martin-kaiser Mar 31, 2026
bb80a16
qemu_riscv64cheripc_defconfig: enable fprobe events
martin-kaiser Mar 31, 2026
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1 change: 1 addition & 0 deletions arch/riscv/configs/qemu_riscv64cheripc_defconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -579,6 +579,7 @@ CONFIG_RCU_EQS_DEBUG=y
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_RETVAL=y
CONFIG_FUNCTION_GRAPH_RETADDR=y
CONFIG_FPROBE=y
CONFIG_FUNCTION_PROFILER=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_TRACER_SNAPSHOT=y
Expand Down
1 change: 0 additions & 1 deletion arch/riscv/include/asm/Kbuild
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Expand Up @@ -4,7 +4,6 @@ syscall-y += syscall_table_64.h

generic-y += early_ioremap.h
generic-y += flat.h
generic-y += fprobe.h
generic-y += kvm_para.h
generic-y += mmzone.h
generic-y += mcs_spinlock.h
Expand Down
11 changes: 11 additions & 0 deletions arch/riscv/include/asm/fprobe.h
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@@ -0,0 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_FPROBE_H
#define _ASM_RISCV_FPROBE_H

#include <asm-generic/fprobe.h>

#ifdef CONFIG_CHERI_KERNEL
#undef ARCH_DEFINE_ENCODE_FPROBE_HEADER
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@scosu scosu Apr 28, 2026

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I think it would be better to only set ARCH_DEFINE_ENCODE_FPROBE_HEADER for !CONFIG_CHERI_KERNEL independent of architecture as it shouldn't work for any architecture, right? I don't think this is specific to risc-v, it's just the first architecture with support for it.

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@martin-kaiser martin-kaiser Apr 30, 2026

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I think this is the other way around. Almost all archs can encode the fprobe header info into one unsigned long. Only risc-v cheri and loongarch can't do this.

#endif

#endif /* _ASM_RISCV_FPROBE_H */
4 changes: 2 additions & 2 deletions include/linux/fprobe.h
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Expand Up @@ -147,9 +147,9 @@ static inline void enable_fprobe(struct fprobe *fp)
fp->flags &= ~FPROBE_FL_DISABLED;
}

/* The entry data size is 4 bits (=16) * sizeof(long) in maximum */
/* The entry data size is 4 bits (=16) * <return stack's word size> in maximum */
#define FPROBE_DATA_SIZE_BITS 4
#define MAX_FPROBE_DATA_SIZE_WORD ((1L << FPROBE_DATA_SIZE_BITS) - 1)
#define MAX_FPROBE_DATA_SIZE (MAX_FPROBE_DATA_SIZE_WORD * sizeof(long))
#define MAX_FPROBE_DATA_SIZE (MAX_FPROBE_DATA_SIZE_WORD * RET_STACK_WORD_SIZE)
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@scosu scosu Apr 28, 2026

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I think all replacements of sizeof(long) with RET_STACK_WORD_SIZE should be moved into the third patch where you introduce it. I think this would be cleaner as you are changing the used size in all of them and it also explains why RET_STACK_WORD_SIZE needs to be in the header and not .c files.

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@martin-kaiser martin-kaiser Apr 30, 2026

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I wanted to keep the shadow stack changes separate from the fprobe changes. The shadow stack is also used by the function graph tracer.


#endif
12 changes: 7 additions & 5 deletions include/linux/ftrace.h
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Expand Up @@ -259,14 +259,14 @@ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs)
}

#ifdef CONFIG_HAVE_REGS_AND_STACK_ACCESS_API
static __always_inline unsigned long
static __always_inline uintptr_t
ftrace_regs_get_kernel_stack_nth(struct ftrace_regs *fregs, unsigned int nth)
{
unsigned long *stackp;
uintptr_t *stackp;

stackp = (unsigned long *)ftrace_regs_get_stack_pointer(fregs);
if (((unsigned long)(stackp + nth) & ~(THREAD_SIZE - 1)) ==
((unsigned long)stackp & ~(THREAD_SIZE - 1)))
stackp = (uintptr_t *)ftrace_regs_get_stack_pointer(fregs);
if (((uintptr_t)(stackp + nth) & ~(THREAD_SIZE - 1)) ==
((uintptr_t)stackp & ~(THREAD_SIZE - 1)))
return *(stackp + nth);

return 0;
Expand Down Expand Up @@ -1212,6 +1212,8 @@ struct ftrace_ret_stack {
uintptr_t *retp;
};

#define RET_STACK_WORD_SIZE sizeof(typeof(*current->ret_stack))
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@scosu scosu Apr 28, 2026

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Can you reduce this to sizeof(*current->ret_stack)?

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@martin-kaiser martin-kaiser Apr 30, 2026

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Ok, typeof() doesn't make things clearer.


/*
* Primary handler of a function return.
* It relays on ftrace_return_to_handler.
Expand Down
10 changes: 5 additions & 5 deletions kernel/trace/fgraph.c
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Expand Up @@ -137,7 +137,7 @@ enum {
#define FGRAPH_DATA_BITS 5
#define FGRAPH_DATA_MASK GENMASK(FGRAPH_DATA_BITS - 1, 0)
#define FGRAPH_DATA_SHIFT (FGRAPH_TYPE_SHIFT + FGRAPH_TYPE_BITS)
#define FGRAPH_MAX_DATA_SIZE (sizeof(long) * (1 << FGRAPH_DATA_BITS))
#define FGRAPH_MAX_DATA_SIZE (RET_STACK_WORD_SIZE * (1 << FGRAPH_DATA_BITS))

#define FGRAPH_DATA_INDEX_BITS 4
#define FGRAPH_DATA_INDEX_MASK GENMASK(FGRAPH_DATA_INDEX_BITS - 1, 0)
Expand Down Expand Up @@ -353,8 +353,8 @@ void *fgraph_reserve_data(int idx, int size_bytes)
if (size_bytes > FGRAPH_MAX_DATA_SIZE)
return NULL;

/* Convert the data size to number of longs. */
data_size = (size_bytes + sizeof(long) - 1) >> (sizeof(long) == 4 ? 2 : 3);
/* Convert the data size to number of stack words. */
data_size = DIV_ROUND_UP(size_bytes, RET_STACK_WORD_SIZE);

val = get_fgraph_entry(current, curr_ret_stack - 1);
data = &current->ret_stack[curr_ret_stack];
Expand Down Expand Up @@ -494,7 +494,7 @@ void *fgraph_retrieve_parent_data(int idx, int *size_bytes, int depth)
return NULL;
found:
if (size_bytes)
*size_bytes = __get_data_size(val) * sizeof(long);
*size_bytes = __get_data_size(val) * RET_STACK_WORD_SIZE;
return get_data_type_data(current, offset);
}

Expand Down Expand Up @@ -573,7 +573,7 @@ ftrace_push_return_trace(uintptr_t ret, unsigned long func,
if (!current->ret_stack)
return -EBUSY;

BUILD_BUG_ON(SHADOW_STACK_SIZE % sizeof(long));
BUILD_BUG_ON(SHADOW_STACK_SIZE % RET_STACK_WORD_SIZE);

/* Set val to "reserved" with the delta to the new fgraph frame */
val = (FGRAPH_TYPE_RESERVED << FGRAPH_TYPE_SHIFT) | FGRAPH_FRAME_OFFSET;
Expand Down
37 changes: 17 additions & 20 deletions kernel/trace/fprobe.c
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Expand Up @@ -22,8 +22,7 @@

#define FPROBE_HASH_BITS 6
#define FPROBE_TABLE_SIZE (1 << FPROBE_HASH_BITS)

#define SIZE_IN_LONG(x) ((x + sizeof(long) - 1) >> (sizeof(long) == 8 ? 3 : 2))
#define SIZE_IN_LONG(x) DIV_ROUND_UP(x, RET_STACK_WORD_SIZE)
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@scosu scosu Apr 28, 2026

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The name SIZE_IN_LONG doesn't make sense any more. Maybe you could rename this to something more appropriate?

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@martin-kaiser martin-kaiser Apr 30, 2026

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I thought it's good to not diverge from upstream. But this is misleading, I'll rename it.


/*
* fprobe_table: hold 'fprobe_hlist::hlist' for checking the fprobe still
Expand Down Expand Up @@ -56,7 +55,7 @@ static struct fprobe_hlist_node *find_first_fprobe_node(unsigned long ip)
struct fprobe_hlist_node *node;
struct hlist_head *head;

head = &fprobe_ip_table[hash_ptr((void *)ip, FPROBE_IP_HASH_BITS)];
head = &fprobe_ip_table[hash_ptr(__c_fakep(ip), FPROBE_IP_HASH_BITS)];
hlist_for_each_entry_rcu(node, head, hlist,
lockdep_is_held(&fprobe_mutex)) {
if (node->addr == ip)
Expand All @@ -80,7 +79,7 @@ static void insert_fprobe_node(struct fprobe_hlist_node *node)
hlist_add_before_rcu(&node->hlist, &next->hlist);
return;
}
head = &fprobe_ip_table[hash_ptr((void *)ip, FPROBE_IP_HASH_BITS)];
head = &fprobe_ip_table[hash_ptr(__c_fakep(ip), FPROBE_IP_HASH_BITS)];
hlist_add_head_rcu(&node->hlist, head);
}

Expand Down Expand Up @@ -153,7 +152,7 @@ static int del_fprobe_hash(struct fprobe *fp)
/* The arch should encode fprobe_header info into one unsigned long */
#define FPROBE_HEADER_SIZE_IN_LONG 1

static inline bool write_fprobe_header(unsigned long *stack,
static inline bool write_fprobe_header(uintptr_t *stack,
struct fprobe *fp, unsigned int size_words)
{
if (WARN_ON_ONCE(size_words > MAX_FPROBE_DATA_SIZE_WORD ||
Expand All @@ -164,7 +163,7 @@ static inline bool write_fprobe_header(unsigned long *stack,
return true;
}

static inline void read_fprobe_header(unsigned long *stack,
static inline void read_fprobe_header(uintptr_t *stack,
struct fprobe **fp, unsigned int *size_words)
{
*fp = arch_decode_fprobe_header_fp(*stack);
Expand All @@ -177,11 +176,11 @@ static inline void read_fprobe_header(unsigned long *stack,
struct __fprobe_header {
struct fprobe *fp;
unsigned long size_words;
} __packed;
} __packed_if_not_cheri;
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@scosu scosu Apr 21, 2026

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I am not sure if this __packed is actually needed or if it could be removed in general. Did you look into this?

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@martin-kaiser martin-kaiser Apr 23, 2026

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I agree that the __packed isn't really needed for non-cheri. Looking at the upstream code, the __packed was added when the second member was changed from int bits to unsigned long size_words. No idea why they did that.

__packed on cheri makes the compilation fail

kernel/trace/fprobe.c:176:8: error: alignment (1) of 'struct __fprobe_header' is less than the required capability alignment (16) [-Werror,-Wcheri-capability-misuse]
  176 | struct __fprobe_header {

The idea of __packed_if_not_cheri was to keep the non-cheri code unchanged.

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@scosu scosu Apr 27, 2026

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I had this patch for removal in my list already, I will probably just propose the patch upstream and see if there are any arguments against removal.


#define FPROBE_HEADER_SIZE_IN_LONG SIZE_IN_LONG(sizeof(struct __fprobe_header))

static inline bool write_fprobe_header(unsigned long *stack,
static inline bool write_fprobe_header(uintptr_t *stack,
struct fprobe *fp, unsigned int size_words)
{
struct __fprobe_header *fph = (struct __fprobe_header *)stack;
Expand All @@ -194,7 +193,7 @@ static inline bool write_fprobe_header(unsigned long *stack,
return true;
}

static inline void read_fprobe_header(unsigned long *stack,
static inline void read_fprobe_header(uintptr_t *stack,
struct fprobe **fp, unsigned int *size_words)
{
struct __fprobe_header *fph = (struct __fprobe_header *)stack;
Expand All @@ -214,7 +213,7 @@ static inline void read_fprobe_header(unsigned long *stack,
* the shadow stack with its entry data size.
*
*/
static inline int __fprobe_handler(unsigned long ip, unsigned long parent_ip,
static inline int __fprobe_handler(unsigned long ip, uintptr_t parent_ip,
struct fprobe *fp, struct ftrace_regs *fregs,
void *data)
{
Expand All @@ -224,7 +223,7 @@ static inline int __fprobe_handler(unsigned long ip, unsigned long parent_ip,
return fp->entry_handler(fp, ip, parent_ip, fregs, data);
}

static inline int __fprobe_kprobe_handler(unsigned long ip, unsigned long parent_ip,
static inline int __fprobe_kprobe_handler(unsigned long ip, uintptr_t parent_ip,
struct fprobe *fp, struct ftrace_regs *fregs,
void *data)
{
Expand All @@ -250,9 +249,9 @@ static int fprobe_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops,
struct ftrace_regs *fregs)
{
struct fprobe_hlist_node *node, *first;
unsigned long *fgraph_data = NULL;
uintptr_t *fgraph_data = NULL;
unsigned long func = trace->func;
unsigned long ret_ip;
uintptr_t ret_ip;
int reserved_words;
struct fprobe *fp;
int used, ret;
Expand Down Expand Up @@ -280,7 +279,7 @@ static int fprobe_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops,
}
node = first;
if (reserved_words) {
fgraph_data = fgraph_reserve_data(gops->idx, reserved_words * sizeof(long));
fgraph_data = fgraph_reserve_data(gops->idx, reserved_words * RET_STACK_WORD_SIZE);
if (unlikely(!fgraph_data)) {
hlist_for_each_entry_from_rcu(node, hlist) {
if (node->addr != func)
Expand Down Expand Up @@ -328,8 +327,6 @@ static int fprobe_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops,
used += FPROBE_HEADER_SIZE_IN_LONG + size_words;
}
}
if (used < reserved_words)
memset(fgraph_data + used, 0, reserved_words - used);

/* If any exit_handler is set, data must be used. */
return used != 0;
Expand All @@ -340,13 +337,13 @@ static void fprobe_return(struct ftrace_graph_ret *trace,
struct fgraph_ops *gops,
struct ftrace_regs *fregs)
{
unsigned long *fgraph_data = NULL;
unsigned long ret_ip;
uintptr_t *fgraph_data = NULL;
uintptr_t ret_ip;
struct fprobe *fp;
int size, curr;
int size_words;

fgraph_data = (unsigned long *)fgraph_retrieve_data(gops->idx, &size);
fgraph_data = (uintptr_t *)fgraph_retrieve_data(gops->idx, &size);
if (WARN_ON_ONCE(!fgraph_data))
return;
size_words = SIZE_IN_LONG(size);
Expand Down Expand Up @@ -621,7 +618,7 @@ static int fprobe_init(struct fprobe *fp, unsigned long *addrs, int num)
if (!fp || !addrs || num <= 0)
return -EINVAL;

size = ALIGN(fp->entry_data_size, sizeof(long));
size = ALIGN(fp->entry_data_size, RET_STACK_WORD_SIZE);
if (size > MAX_FPROBE_DATA_SIZE)
return -E2BIG;
fp->entry_data_size = size;
Expand Down
6 changes: 3 additions & 3 deletions kernel/trace/trace.h
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Expand Up @@ -165,13 +165,13 @@ struct kretprobe_trace_entry_head {

struct fentry_trace_entry_head {
struct trace_entry ent;
uintptr_t ip;
ptraddr_t ip;
};

struct fexit_trace_entry_head {
struct trace_entry ent;
uintptr_t func;
uintptr_t ret_ip;
ptraddr_t func;
ptraddr_t ret_ip;
};

#define TRACE_BUF_SIZE 1024
Expand Down
22 changes: 11 additions & 11 deletions kernel/trace/trace_fprobe.c
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Expand Up @@ -81,7 +81,7 @@ static unsigned long tracepoint_user_ip(struct tracepoint_user *tuser)
if (!tuser->tpoint)
return 0UL;

return (unsigned long)tuser->tpoint->probestub;
return __c_pa(tuser->tpoint->probestub);
}

static void __tracepoint_user_free(struct tracepoint_user *tuser)
Expand Down Expand Up @@ -279,7 +279,7 @@ process_fetch_insn(struct fetch_insn *code, void *rec, void *edata,
void *dest, void *base)
{
struct ftrace_regs *fregs = rec;
unsigned long val;
uintptr_t val;
int ret;

retry:
Expand All @@ -299,7 +299,7 @@ process_fetch_insn(struct fetch_insn *code, void *rec, void *edata,
val = ftrace_regs_get_argument(fregs, code->param);
break;
case FETCH_OP_EDATA:
val = *(unsigned long *)((unsigned long)edata + code->offset);
val = *(uintptr_t *)((uintptr_t)edata + code->offset);
break;
#endif
case FETCH_NOP_SYMBOL: /* Ignore a place holder */
Expand Down Expand Up @@ -363,7 +363,7 @@ static nokprobe_inline
void store_fprobe_entry_data(void *edata, struct trace_probe *tp, struct ftrace_regs *fregs)
{
struct probe_entry_arg *earg = tp->entry_arg;
unsigned long val = 0;
uintptr_t val = 0;
int i;

if (!earg)
Expand All @@ -377,7 +377,7 @@ void store_fprobe_entry_data(void *edata, struct trace_probe *tp, struct ftrace_
val = ftrace_regs_get_argument(fregs, code->param);
break;
case FETCH_OP_ST_EDATA:
*(unsigned long *)((unsigned long)edata + code->offset) = val;
*(uintptr_t *)((uintptr_t)edata + code->offset) = val;
break;
case FETCH_OP_END:
goto end;
Expand Down Expand Up @@ -429,15 +429,15 @@ __fexit_trace_func(struct trace_fprobe *tf, unsigned long entry_ip,
fbuffer.regs = ftrace_get_regs(fregs);
entry = fbuffer.entry = ring_buffer_event_data(fbuffer.event);
entry->func = entry_ip;
entry->ret_ip = ret_ip;
entry->ret_ip = __c_ua(ret_ip);
store_trace_args(&entry[1], &tf->tp, fregs, entry_data, sizeof(*entry), dsize);

trace_event_buffer_commit(&fbuffer);
}

static void
fexit_trace_func(struct trace_fprobe *tf, unsigned long entry_ip,
unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data)
uintptr_t ret_ip, struct ftrace_regs *fregs, void *entry_data)
{
struct event_file_link *link;

Expand Down Expand Up @@ -484,7 +484,7 @@ NOKPROBE_SYMBOL(fentry_perf_func);

static void
fexit_perf_func(struct trace_fprobe *tf, unsigned long entry_ip,
unsigned long ret_ip, struct ftrace_regs *fregs,
uintptr_t ret_ip, struct ftrace_regs *fregs,
void *entry_data)
{
struct trace_event_call *call = trace_probe_event_call(&tf->tp);
Expand All @@ -510,7 +510,7 @@ fexit_perf_func(struct trace_fprobe *tf, unsigned long entry_ip,
regs = ftrace_fill_perf_regs(fregs, regs);

entry->func = entry_ip;
entry->ret_ip = ret_ip;
entry->ret_ip = __c_ua(ret_ip);
store_trace_args(&entry[1], &tf->tp, fregs, entry_data, sizeof(*entry), dsize);
perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
head, NULL);
Expand Down Expand Up @@ -1318,7 +1318,7 @@ static int trace_fprobe_create_internal(int argc, const char *argv[],
sbuf = kmalloc(KSYM_NAME_LEN, GFP_KERNEL);
if (!sbuf)
return -ENOMEM;
ctx->funcname = kallsyms_lookup((unsigned long)tpoint->probestub,
ctx->funcname = kallsyms_lookup(__c_pa(tpoint->probestub),
NULL, NULL, NULL, sbuf);
}
}
Expand Down Expand Up @@ -1368,7 +1368,7 @@ static int trace_fprobe_create_internal(int argc, const char *argv[],
if (is_return && tf->tp.entry_arg) {
tf->fp.entry_handler = trace_fprobe_entry_handler;
tf->fp.entry_data_size = traceprobe_get_entry_data_size(&tf->tp);
if (ALIGN(tf->fp.entry_data_size, sizeof(long)) > MAX_FPROBE_DATA_SIZE) {
if (ALIGN(tf->fp.entry_data_size, RET_STACK_WORD_SIZE) > MAX_FPROBE_DATA_SIZE) {
trace_probe_log_set_index(2);
trace_probe_log_err(0, TOO_MANY_EARGS);
return -E2BIG;
Expand Down
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