From: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> commit 820b8963adaea34a87abbecb906d1f54c0aabfb7 upstream. The trace event sock_exceed_buf_limit saves the prot->sysctl_mem pointer and then dereferences it in the TP_printk() portion. This is unsafe as the TP_printk() portion is executed at the time the buffer is read. That is, it can be seconds, minutes, days, months, even years later. If the proto is freed, then this dereference will can also lead to a kernel crash. Instead, save the sysctl_mem array into the ring buffer and have the TP_printk() reference that instead. This is the proper and safe way to read pointers in trace events. Link: https://lore.kernel.org/all/20220706052130.16368-12-kuniyu@xxxxxxxxxx/ Cc: stable@xxxxxxxxxxxxxxx Fixes: 3847ce32aea9f ("core: add tracepoints for queueing skb to rcvbuf") Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Acked-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/trace/events/sock.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/include/trace/events/sock.h +++ b/include/trace/events/sock.h @@ -38,7 +38,7 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_STRUCT__entry( __array(char, name, 32) - __field(long *, sysctl_mem) + __array(long, sysctl_mem, 3) __field(long, allocated) __field(int, sysctl_rmem) __field(int, rmem_alloc) @@ -46,7 +46,9 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_fast_assign( strncpy(__entry->name, prot->name, 32); - __entry->sysctl_mem = prot->sysctl_mem; + __entry->sysctl_mem[0] = READ_ONCE(prot->sysctl_mem[0]); + __entry->sysctl_mem[1] = READ_ONCE(prot->sysctl_mem[1]); + __entry->sysctl_mem[2] = READ_ONCE(prot->sysctl_mem[2]); __entry->allocated = allocated; __entry->sysctl_rmem = prot->sysctl_rmem[0]; __entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
