From: Steven Rostedt (Google) Date: Thu, 7 Apr 2022 18:56:32 +0000 (-0400) Subject: tracing: Have event format check not flag %p* on __get_dynamic_array() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=499f12168aebd6da8fa32c9b7d6203ca9b5eb88d;p=linux.git tracing: Have event format check not flag %p* on __get_dynamic_array() The print fmt check against trace events to make sure that the format does not use pointers that may be freed from the time of the trace to the time the event is read, gives a false positive on %pISpc when reading data that was saved in __get_dynamic_array() when it is perfectly fine to do so, as the data being read is on the ring buffer. Link: https://lore.kernel.org/all/20220407144524.2a592ed6@canb.auug.org.au/ Cc: stable@vger.kernel.org Fixes: 5013f454a352c ("tracing: Add check of trace event print fmts for dereferencing pointers") Reported-by: Stephen Rothwell Signed-off-by: Steven Rostedt (Google) --- diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 78f313b7b3151..d5913487821ab 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -392,12 +392,6 @@ static void test_event_printk(struct trace_event_call *call) if (!(dereference_flags & (1ULL << arg))) goto next_arg; - /* Check for __get_sockaddr */; - if (str_has_prefix(fmt + i, "__get_sockaddr(")) { - dereference_flags &= ~(1ULL << arg); - goto next_arg; - } - /* Find the REC-> in the argument */ c = strchr(fmt + i, ','); r = strstr(fmt + i, "REC->"); @@ -413,7 +407,14 @@ static void test_event_printk(struct trace_event_call *call) a = strchr(fmt + i, '&'); if ((a && (a < r)) || test_field(r, call)) dereference_flags &= ~(1ULL << arg); + } else if ((r = strstr(fmt + i, "__get_dynamic_array(")) && + (!c || r < c)) { + dereference_flags &= ~(1ULL << arg); + } else if ((r = strstr(fmt + i, "__get_sockaddr(")) && + (!c || r < c)) { + dereference_flags &= ~(1ULL << arg); } + next_arg: i--; arg++;