[GIT PULL] probes: Fixes for v6.12-rc4-2

From: Google
Date: Wed Oct 23 2024 - 10:54:03 EST


Hi Linus,

Probes fixes for v6.12-rc4(2):

- objpool: Fix choosing allocation for percpu slots
Fixes to allocate objpool's percpu slots correctly according to the
GFP flag. It checks whether "any bit" in GFP_ATOMIC is set to choose
the vmalloc source, but it should check "all bits" in GFP_ATOMIC flag
is set, because GFP_ATOMIC is a combined flag.

- tracing/probes: Fix MAX_TRACE_ARGS limit handling
If more than MAX_TRACE_ARGS are passed for creating a probe event, the
entries over MAX_TRACE_ARG in trace_arg array are not initialized.
Thus if the kernel accesses those entries, it crashes. This rejects
creating event if the number of arguments is over MAX_TRACE_ARGS.

- tracing: Consider the NULL character when validating the event length
A strlen() is used when parsing the event name, and the original code
does not consider the terminal null byte. Thus it can pass the name
1 byte longer than the buffer. This fixes to check it correctly.


Please pull the latest probes-fixes-v6.12-rc4.2 tree, which can be found at:


git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
probes-fixes-v6.12-rc4.2

Tag SHA1: 62eeda86599cd8c8fe92b4bc6181ef6d2c1e6e03
Head SHA1: 0b6e2e22cb23105fcb171ab92f0f7516c69c8471


Leo Yan (1):
tracing: Consider the NULL character when validating the event length

Mikel Rychliski (1):
tracing/probes: Fix MAX_TRACE_ARGS limit handling

Viktor Malik (1):
objpool: fix choosing allocation for percpu slots

----
kernel/trace/trace_eprobe.c | 7 ++++++-
kernel/trace/trace_fprobe.c | 6 +++++-
kernel/trace/trace_kprobe.c | 6 +++++-
kernel/trace/trace_probe.c | 2 +-
kernel/trace/trace_uprobe.c | 4 +++-
lib/objpool.c | 2 +-
6 files changed, 21 insertions(+), 6 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>