Oleg Nesterov fe5e9182d3 uprobes: fix kernel info leak via "[uprobes]" vma ...

commit 34820304cc2cd1804ee1f8f3504ec77813d29c8e upstream.

xol_add_vma() maps the uninitialized page allocated by __create_xol_area()
into userspace. On some architectures (x86) this memory is readable even
without VM_READ, VM_EXEC results in the same pgprot_t as VM_EXEC|VM_READ,
although this doesn't really matter, debugger can read this memory anyway.

Link: https://lore.kernel.org/all/20240929162047.GA12611@redhat.com/

Reported-by: Will Deacon <will@kernel.org>
Fixes: d4b3b6384f98 ("uprobes/core: Allocate XOL slots for uprobes use")
Cc: stable@vger.kernel.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-11-08 16:20:42 +01:00

..

callchain.c

perf/core: Convert to SPDX license identifiers

2019-02-04 08:46:11 +01:00

core.c

perf/core: Fix small negative period being ignored

2024-11-08 16:20:40 +01:00

hw_breakpoint.c

perf/hw_breakpoint: Fix arch_hw_breakpoint use-before-initialization

2019-09-06 08:24:01 +02:00

internal.h

perf: Fix perf_aux_size() for greater-than 32-bit size

2024-08-19 05:33:29 +02:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ring_buffer.c

perf/core: Add a new read format to get a number of lost samples

2023-12-13 18:18:15 +01:00

uprobes.c

uprobes: fix kernel info leak via "[uprobes]" vma

2024-11-08 16:20:42 +01:00