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tracing: Fix reading strings from synthetic events
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The follow commands caused a crash:

  # cd /sys/kernel/tracing
  # echo 's:open char file[]' > dynamic_events
  # echo 'hist:keys=common_pid:file=filename:onchange($file).trace(open,$file)' > events/syscalls/sys_enter_openat/trigger'
  # echo 1 > events/synthetic/open/enable

BOOM!

The problem is that the synthetic event field "char file[]" will read
the value given to it as a string without any memory checks to make sure
the address is valid. The above example will pass in the user space
address and the sythetic event code will happily call strlen() on it
and then strscpy() where either one will cause an oops when accessing
user space addresses.

Use the helper functions from trace_kprobe and trace_eprobe that can
read strings safely (and actually succeed when the address is from user
space and the memory is mapped in).

Now the above can show:

     packagekitd-1721    [000] ...2.   104.597170: open: file=/usr/lib/rpm/fileattrs/cmake.attr
    in:imjournal-978     [006] ...2.   104.599642: open: file=/var/lib/rsyslog/imjournal.state.tmp
     packagekitd-1721    [000] ...2.   104.626308: open: file=/usr/lib/rpm/fileattrs/debuginfo.attr

Link: https://lkml.kernel.org/r/20221012104534.826549315@goodmis.org

Cc: stable@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Fixes: bd82631 ("tracing: Add support for dynamic strings to synthetic events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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Steven Rostedt (Google) committed Oct 12, 2022
1 parent 2e9906f commit 0934ae9
Showing 1 changed file with 17 additions and 6 deletions.
23 changes: 17 additions & 6 deletions kernel/trace/trace_events_synth.c
Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@
/* for gfp flag names */
#include <linux/trace_events.h>
#include <trace/events/mmflags.h>
#include "trace_probe.h"
#include "trace_probe_kernel.h"

#include "trace_synth.h"

Expand Down Expand Up @@ -409,6 +411,7 @@ static unsigned int trace_string(struct synth_trace_event *entry,
{
unsigned int len = 0;
char *str_field;
int ret;

if (is_dynamic) {
u32 data_offset;
Expand All @@ -417,19 +420,27 @@ static unsigned int trace_string(struct synth_trace_event *entry,
data_offset += event->n_u64 * sizeof(u64);
data_offset += data_size;

str_field = (char *)entry + data_offset;

len = strlen(str_val) + 1;
strscpy(str_field, str_val, len);
len = kern_fetch_store_strlen((unsigned long)str_val);

data_offset |= len << 16;
*(u32 *)&entry->fields[*n_u64] = data_offset;

ret = kern_fetch_store_string((unsigned long)str_val, &entry->fields[*n_u64], entry);

(*n_u64)++;
} else {
str_field = (char *)&entry->fields[*n_u64];

strscpy(str_field, str_val, STR_VAR_LEN_MAX);
#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
if ((unsigned long)str_val < TASK_SIZE)
ret = strncpy_from_user_nofault(str_field, str_val, STR_VAR_LEN_MAX);
else
#endif
ret = strncpy_from_kernel_nofault(str_field, str_val, STR_VAR_LEN_MAX);

if (ret < 0)
strcpy(str_field, FAULT_STRING);

(*n_u64) += STR_VAR_LEN_MAX / sizeof(u64);
}

Expand Down Expand Up @@ -462,7 +473,7 @@ static notrace void trace_event_raw_event_synth(void *__data,
val_idx = var_ref_idx[field_pos];
str_val = (char *)(long)var_ref_vals[val_idx];

len = strlen(str_val) + 1;
len = kern_fetch_store_strlen((unsigned long)str_val);

fields_size += len;
}
Expand Down

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