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One small fix and one clean up

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A small fix Pavel sent me back in august was accidentally lost due to it
 being placed with some other patches that failed some tests, and was rebased
 out of my local tree. Which was a regression that caused event filters
 not to handle negative numbers.
 
 The clean up is from Masami that realized that the code in kprobes that
 calls probe_mem_read() wrapper, which is to be used in code used by both
 kprobes and uprobes, was only in code for kprobes. It should not use the
 wrapper there, but instead call probe_kernel_read() directly.
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Merge tag 'trace-v5.0-pre' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix/cleanup from Steven Rostedt:
 "This is a "pre-pull". It's only one small fix and one small clean up.
  I'm testing a few small patches for my real pull request which will
  come at a later time. The second patch depends on your tree anyway so
  I included it along with the urgent fix.

  A small fix Pavel sent me back in august was accidentally lost due to
  it being placed with some other patches that failed some tests, and
  was rebased out of my local tree. Which was a regression that caused
  event filters not to handle negative numbers.

  The clean up is from Masami that realized that the code in kprobes
  that calls probe_mem_read() wrapper, which is to be used in code used
  by both kprobes and uprobes, was only in code for kprobes. It should
  not use the wrapper there, but instead call probe_kernel_read()
  directly"

* tag 'trace-v5.0-pre' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing/kprobes: Use probe_kernel_read instead of probe_mem_read
  tracing: Fix event filters and triggers to handle negative numbers
This commit is contained in:
Linus Torvalds 2019-03-07 09:55:56 -08:00
commit bdfa15f1a3
2 changed files with 5 additions and 2 deletions
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5
kernel/trace/trace_events_filter.c
View File

@ -1301,7 +1301,7 @@ static int parse_pred(const char *str, void *data,
/* go past the last quote */
i++;
} else if (isdigit(str[i])) {
} else if (isdigit(str[i]) || str[i] == '-') {
/* Make sure the field is not a string */
if (is_string_field(field)) {
@ -1314,6 +1314,9 @@ static int parse_pred(const char *str, void *data,
goto err_free;
}
if (str[i] == '-')
i++;
/* We allow 0xDEADBEEF */
while (isalnum(str[i]))
i++;

2
kernel/trace/trace_kprobe.c
View File

@ -865,7 +865,7 @@ fetch_store_strlen(unsigned long addr)
u8 c;
do {
ret = probe_mem_read(&c, (u8 *)addr + len, 1);
ret = probe_kernel_read(&c, (u8 *)addr + len, 1);
len++;
} while (c && ret == 0 && len < MAX_STRING_SIZE);