Peter Zijlstra a0a8009083 perf: Revert to requiring CAP_SYS_ADMIN for uprobes ...

[ Upstream commit ba677dbe77 ]

Jann reports that uprobes can be used destructively when used in the
middle of an instruction. The kernel only verifies there is a valid
instruction at the requested offset, but due to variable instruction
length cannot determine if this is an instruction as seen by the
intended execution stream.

Additionally, Mark Rutland notes that on architectures that mix data
in the text segment (like arm64), a similar things can be done if the
data word is 'mistaken' for an instruction.

As such, require CAP_SYS_ADMIN for uprobes.

Fixes: c9e0924e5c ("perf/core: open access to probes for CAP_PERFMON privileged process")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/CAG48ez1n4520sq0XrWYDHKiKxE_+WCfAK+qt9qkY4ZiBGmL-5g@mail.gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-07-17 18:37:03 +02:00

..

callchain.c

…

core.c

perf: Revert to requiring CAP_SYS_ADMIN for uprobes

2025-07-17 18:37:03 +02:00

hw_breakpoint_test.c

…

hw_breakpoint.c

perf/hw_breakpoint: Return EOPNOTSUPP for unsupported breakpoint type

2025-05-29 11:02:32 +02:00

internal.h

perf/core: Add aux_pause, aux_resume, aux_start_paused

2025-04-20 10:15:10 +02:00

Makefile

…

ring_buffer.c

perf: Avoid the read if the count is already updated

2025-05-29 11:03:02 +02:00

uprobes.c

uprobes/x86: Harden uretprobe syscall trampoline check

2025-04-10 14:39:37 +02:00