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uprobes: kill uprobe_register_refctr()

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It doesn't make any sense to have 2 versions of _register(). Note that
trace_uprobe_enable(), the only user of uprobe_register(), doesn't need
to check tu->ref_ctr_offset to decide which one should be used, it could
safely pass ref_ctr_offset == 0 to uprobe_register_refctr().

Add this argument to uprobe_register(), update the callers, and kill
uprobe_register_refctr().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240801132728.GA8800@redhat.com
This commit is contained in:
Oleg Nesterov 2024-08-01 15:27:28 +02:00 committed by Peter Zijlstra
parent db61e6a4ee
commit e04332ebc8
5 changed files with 15 additions and 37 deletions
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9
include/linux/uprobes.h
View File

@ -112,8 +112,7 @@ extern bool is_trap_insn(uprobe_opcode_t *insn);
extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs);
extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs);
extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
extern int uprobe_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc);
extern int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc);
extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
extern int uprobe_mmap(struct vm_area_struct *vma);
@ -154,11 +153,7 @@ static inline void uprobes_init(void)
#define uprobe_get_trap_addr(regs) instruction_pointer(regs)
static inline int
uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
{
return -ENOSYS;
}
static inline int uprobe_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc)
uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc)
{
return -ENOSYS;
}

24
kernel/events/uprobes.c
View File

@ -1121,25 +1121,26 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
EXPORT_SYMBOL_GPL(uprobe_unregister);
/*
* __uprobe_register - register a probe
* uprobe_register - register a probe
* @inode: the file in which the probe has to be placed.
* @offset: offset from the start of the file.
* @ref_ctr_offset: offset of SDT marker / reference counter
* @uc: information on howto handle the probe..
*
* Apart from the access refcount, __uprobe_register() takes a creation
* Apart from the access refcount, uprobe_register() takes a creation
* refcount (thro alloc_uprobe) if and only if this @uprobe is getting
* inserted into the rbtree (i.e first consumer for a @inode:@offset
* tuple). Creation refcount stops uprobe_unregister from freeing the
* @uprobe even before the register operation is complete. Creation
* refcount is released when the last @uc for the @uprobe
* unregisters. Caller of __uprobe_register() is required to keep @inode
* unregisters. Caller of uprobe_register() is required to keep @inode
* (and the containing mount) referenced.
*
* Return errno if it cannot successully install probes
* else return 0 (success)
*/
static int __uprobe_register(struct inode *inode, loff_t offset,
loff_t ref_ctr_offset, struct uprobe_consumer *uc)
int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset,
struct uprobe_consumer *uc)
{
struct uprobe *uprobe;
int ret;
@ -1189,21 +1190,8 @@ static int __uprobe_register(struct inode *inode, loff_t offset,
goto retry;
return ret;
}
int uprobe_register(struct inode *inode, loff_t offset,
struct uprobe_consumer *uc)
{
return __uprobe_register(inode, offset, 0, uc);
}
EXPORT_SYMBOL_GPL(uprobe_register);
int uprobe_register_refctr(struct inode *inode, loff_t offset,
loff_t ref_ctr_offset, struct uprobe_consumer *uc)
{
return __uprobe_register(inode, offset, ref_ctr_offset, uc);
}
EXPORT_SYMBOL_GPL(uprobe_register_refctr);
/*
* uprobe_apply - unregister an already registered probe.
* @inode: the file in which the probe has to be removed.

8
kernel/trace/bpf_trace.c
View File

@ -3480,10 +3480,10 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
&bpf_uprobe_multi_link_lops, prog);
for (i = 0; i < cnt; i++) {
err = uprobe_register_refctr(d_real_inode(link->path.dentry),
uprobes[i].offset,
uprobes[i].ref_ctr_offset,
&uprobes[i].consumer);
err = uprobe_register(d_real_inode(link->path.dentry),
uprobes[i].offset,
uprobes[i].ref_ctr_offset,
&uprobes[i].consumer);
if (err) {
bpf_uprobe_unregister(&path, uprobes, i);
goto error_free;

7
kernel/trace/trace_uprobe.c
View File

@ -1089,12 +1089,7 @@ static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter)
tu->consumer.filter = filter;
tu->inode = d_real_inode(tu->path.dentry);
if (tu->ref_ctr_offset)
ret = uprobe_register_refctr(tu->inode, tu->offset,
tu->ref_ctr_offset, &tu->consumer);
else
ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
ret = uprobe_register(tu->inode, tu->offset, tu->ref_ctr_offset, &tu->consumer);
if (ret)
tu->inode = NULL;

4
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
View File

@ -458,8 +458,8 @@ static int testmod_register_uprobe(loff_t offset)
if (err)
goto out;
err = uprobe_register_refctr(d_real_inode(uprobe.path.dentry),
offset, 0, &uprobe.consumer);
err = uprobe_register(d_real_inode(uprobe.path.dentry),
offset, 0, &uprobe.consumer);
if (err)
path_put(&uprobe.path);
else