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bpf: Use user_path_at for path resolution in uprobe_multi

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Resolve the uprobe_multi user path with user_path_at() instead of copying
the string with strndup_user() and passing it to kern_path(). This removes
the temporary allocation and keeps the lookup logic in one helper.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260611114230.950379-3-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa
2026-06-11 13:42:25 +02:00
committed by Alexei Starovoitov
parent 4d87a251d4
commit 65d81609e9
1 changed files with 1 additions and 9 deletions
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10
kernel/trace/bpf_trace.c
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@@ -3227,7 +3227,6 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
unsigned long size;
u32 flags, cnt, i;
struct path path;
char *name;
pid_t pid;
int err;
@@ -3272,14 +3271,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
!access_ok(ucookies, size))
return -EFAULT;
name = strndup_user(upath, PATH_MAX);
if (IS_ERR(name)) {
err = PTR_ERR(name);
return err;
}
err = kern_path(name, LOOKUP_FOLLOW, &path);
kfree(name);
err = user_path_at(AT_FDCWD, upath, LOOKUP_FOLLOW, &path);
if (err)
return err;