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Revert "bpf: fix unpopulated name_len field in perf_event link info"

Browse Source 
This reverts commit e5c2b971db which is
commit 4deecdd29c upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: If96fcef48cfa8a3507e6cc3d2d171af12594869c
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2024-12-02 10:33:55 +00:00
parent d132b93edf
commit 8780507bc3
1 changed files with 7 additions and 22 deletions
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29
kernel/bpf/syscall.c
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@ -3440,16 +3440,15 @@ static void bpf_perf_link_dealloc(struct bpf_link *link)
}
static int bpf_perf_link_fill_common(const struct perf_event *event,
char __user *uname, u32 *ulenp,
char __user *uname, u32 ulen,
u64 *probe_offset, u64 *probe_addr,
u32 *fd_type, unsigned long *missed)
{
const char *buf;
u32 prog_id, ulen;
u32 prog_id;
size_t len;
int err;
ulen = *ulenp;
if (!ulen ^ !uname)
return -EINVAL;
@ -3457,17 +3456,10 @@ static int bpf_perf_link_fill_common(const struct perf_event *event,
probe_offset, probe_addr, missed);
if (err)
return err;
if (buf) {
len = strlen(buf);
*ulenp = len + 1;
} else {
*ulenp = 1;
}
if (!uname)
return 0;
if (buf) {
len = strlen(buf);
err = bpf_copy_to_user(uname, buf, ulen, len);
if (err)
return err;
@ -3492,7 +3484,7 @@ static int bpf_perf_link_fill_kprobe(const struct perf_event *event,
uname = u64_to_user_ptr(info->perf_event.kprobe.func_name);
ulen = info->perf_event.kprobe.name_len;
err = bpf_perf_link_fill_common(event, uname, &ulen, &offset, &addr,
err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
&type, &missed);
if (err)
return err;
@ -3500,7 +3492,7 @@ static int bpf_perf_link_fill_kprobe(const struct perf_event *event,
info->perf_event.type = BPF_PERF_EVENT_KRETPROBE;
else
info->perf_event.type = BPF_PERF_EVENT_KPROBE;
info->perf_event.kprobe.name_len = ulen;
info->perf_event.kprobe.offset = offset;
info->perf_event.kprobe.missed = missed;
if (!kallsyms_show_value(current_cred()))
@ -3522,7 +3514,7 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
uname = u64_to_user_ptr(info->perf_event.uprobe.file_name);
ulen = info->perf_event.uprobe.name_len;
err = bpf_perf_link_fill_common(event, uname, &ulen, &offset, &addr,
err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
&type, NULL);
if (err)
return err;
@ -3531,7 +3523,6 @@ static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
info->perf_event.type = BPF_PERF_EVENT_URETPROBE;
else
info->perf_event.type = BPF_PERF_EVENT_UPROBE;
info->perf_event.uprobe.name_len = ulen;
info->perf_event.uprobe.offset = offset;
info->perf_event.uprobe.cookie = event->bpf_cookie;
return 0;
@ -3557,18 +3548,12 @@ static int bpf_perf_link_fill_tracepoint(const struct perf_event *event,
{
char __user *uname;
u32 ulen;
int err;
uname = u64_to_user_ptr(info->perf_event.tracepoint.tp_name);
ulen = info->perf_event.tracepoint.name_len;
err = bpf_perf_link_fill_common(event, uname, &ulen, NULL, NULL, NULL, NULL);
if (err)
return err;
info->perf_event.type = BPF_PERF_EVENT_TRACEPOINT;
info->perf_event.tracepoint.name_len = ulen;
info->perf_event.tracepoint.cookie = event->bpf_cookie;
return 0;
return bpf_perf_link_fill_common(event, uname, ulen, NULL, NULL, NULL, NULL);
}
static int bpf_perf_link_fill_perf_event(const struct perf_event *event,