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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-27 18:30:30 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-27 18:30:30 +0300 |
commit | 77d64656950b299f5e7c70f1e3a0bdc991b51497 (patch) | |
tree | 91e5a8c9d9e5e791301225e4e0b658b4fd5b3e81 /kernel | |
parent | c86daad2c25bfd4a33d48b7691afaa96d9c5ab46 (diff) | |
parent | 6ee98ffeea0bc9e072e419497d78697d8afcdd6d (diff) | |
download | linux-77d64656950b299f5e7c70f1e3a0bdc991b51497.tar.xz |
Merge tag 'trace-v4.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull ftrace fixes from Steven Rostedt:
"There's been a few memory issues found with ftrace.
One was simply a memory leak where not all was being freed that should
have been in releasing a file pointer on set_graph_function.
Then Thomas found that the ftrace trampolines were marked for
read/write as well as execute. To shrink the possible attack surface,
he added calls to set them to ro. Which also uncovered some other
issues with freeing module allocated memory that had its permissions
changed.
Kprobes had a similar issue which is fixed and a selftest was added to
trigger that issue again"
* tag 'trace-v4.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
x86/ftrace: Make sure that ftrace trampolines are not RWX
x86/mm/ftrace: Do not bug in early boot on irqs_disabled in cpu_flush_range()
selftests/ftrace: Add a testcase for many kprobe events
kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
ftrace: Fix memory leak in ftrace_graph_release()
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/kprobes.c | 2 | ||||
-rw-r--r-- | kernel/trace/ftrace.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 2d2d3a568e4e..adfe3b4cfe05 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -122,7 +122,7 @@ static void *alloc_insn_page(void) return module_alloc(PAGE_SIZE); } -static void free_insn_page(void *page) +void __weak free_insn_page(void *page) { module_memfree(page); } diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 74fdfe9ed3db..9e5841dc14b5 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -5063,7 +5063,7 @@ ftrace_graph_release(struct inode *inode, struct file *file) } out: - kfree(fgd->new_hash); + free_ftrace_hash(fgd->new_hash); kfree(fgd); return ret; |