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a=2JgSa4NbpEOStq-L5dxp:22 a=jhqOcbufqs7Y1TYCrUUU:22 a=Yupwre4RP9_Eg_Bd0iYG:22 X-Proofpoint-GUID: U_zF09Hf-pik51c5j7n4o3YQ0rp5qU0a X-Proofpoint-Spam-Info: AW1haW4tMjYwODI5MDE3NSBTYWx0ZWRfX28idCistMoET 8EC9nPtqmb74/fs5XVQmK/p8ONjRNRdPeGdI8RqJoOya32QdpKIdRIVBOPIOFbB+bQ8XS2Q9/5y jDzVmxYA8WOzycCgjAl9gqgi06HLkgJ5JLXs3HKxPnlglQo9pEXg Hi Greg/Sasha, On 20/08/26 8:26 pm, Greg Kroah-Hartman wrote: > 6.12-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Steven Rostedt > > [ Upstream commit 60bc720e10eac397b3adae975095df77bc368b88 ] > > Convert the taking of the buffer->mutex and the cpu_buffer->mapping_lock > over to guard(mutex) and simplify the ring_buffer_map() and > ring_buffer_unmap() functions. > > Cc: Masami Hiramatsu > Cc: Mathieu Desnoyers > Cc: Vincent Donnefort > Link: https://lore.kernel.org/20250527122009.267efb72@gandalf.local.home > Signed-off-by: Steven Rostedt (Google) > Stable-dep-of: 7c727dfce6be ("ring-buffer: Prevent resizing of persistent ring buffer") > Signed-off-by: Sasha Levin > Signed-off-by: Greg Kroah-Hartman > --- > kernel/trace/ring_buffer.c | 35 +++++++++++------------------------ > 1 file changed, 11 insertions(+), 24 deletions(-) > > --- a/kernel/trace/ring_buffer.c > +++ b/kernel/trace/ring_buffer.c > @@ -7097,36 +7097,34 @@ int ring_buffer_map(struct trace_buffer > { > struct ring_buffer_per_cpu *cpu_buffer; > unsigned long flags, *subbuf_ids; > - int err = 0; > + int err; > > if (!cpumask_test_cpu(cpu, buffer->cpumask)) > return -EINVAL; > > cpu_buffer = buffer->buffers[cpu]; > > - mutex_lock(&cpu_buffer->mapping_lock); > + guard(mutex)(&cpu_buffer->mapping_lock); > > if (cpu_buffer->user_mapped) { > err = __rb_map_vma(cpu_buffer, vma); > if (!err) > err = __rb_inc_dec_mapped(cpu_buffer, true); > - mutex_unlock(&cpu_buffer->mapping_lock); > return err; > } > > /* prevent another thread from changing buffer/sub-buffer sizes */ > - mutex_lock(&buffer->mutex); > + guard(mutex)(&buffer->mutex); > > err = rb_alloc_meta_page(cpu_buffer); > if (err) > - goto unlock; > + return err; > > /* subbuf_ids include the reader while nr_pages does not */ > subbuf_ids = kcalloc(cpu_buffer->nr_pages + 1, sizeof(*subbuf_ids), GFP_KERNEL); > if (!subbuf_ids) { > rb_free_meta_page(cpu_buffer); > - err = -ENOMEM; > - goto unlock; > + return -ENOMEM; > } > > atomic_inc(&cpu_buffer->resize_disabled); > @@ -7154,11 +7152,7 @@ int ring_buffer_map(struct trace_buffer > atomic_dec(&cpu_buffer->resize_disabled); > } > > -unlock: > - mutex_unlock(&buffer->mutex); > - mutex_unlock(&cpu_buffer->mapping_lock); > - > - return err; > + return 0; ^^^ I ran an AI-assisted backport review and then checked c7f40b670e5c against the 6.12.y code. The refactor changes the first-map exit in ring_buffer_map() from: return err; to: return 0; That unconditional success remains in 6.12.y. If __rb_map_vma() rejects a writable, executable, private, wrongly sized, or otherwise invalid mapping, ring_buffer_map() rolls its setup back but masks the error. As a result, tracing_buffers_mmap() reports the rejected mapping as successful instead of taking its error-cleanup path. Upstream fixes this with de4cbd704731 ("ring buffer: Propagate __rb_map_vma return value to caller"). I think we need to take this as well. thanks, Harshit > }