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Filename Latest commit message Latest commit date
Chen Zhongjin 2668aeac01 x86/unwind/orc: Unwind ftrace trampolines with correct ORC entry 
commit fc2e426b1161761561624ebd43ce8c8d2fa058da upstream.

When meeting ftrace trampolines in ORC unwinding, unwinder uses address
of ftrace_{regs_}call address to find the ORC entry, which gets next frame at
sp+176.

If there is an IRQ hitting at sub $0xa8,%rsp, the next frame should be
sp+8 instead of 176. It makes unwinder skip correct frame and throw
warnings such as "wrong direction" or "can't access registers", etc,
depending on the content of the incorrect frame address.

By adding the base address ftrace_{regs_}caller with the offset
*ip - ops->trampoline*, we can get the correct address to find the ORC entry.

Also change "caller" to "tramp_addr" to make variable name conform to
its content.

[ mingo: Clarified the changelog a bit. ]

Fixes: 6be7fa3c74 ("ftrace, orc, x86: Handle ftrace dynamically allocated trampolines")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220819084334.244016-1-chenzhongjin@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-05 10:27:43 +02:00
arch x86/unwind/orc: Unwind ftrace trampolines with correct ORC entry 2022-09-05 10:27:43 +02:00
block
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Documentation
drivers ixgbe: stop resetting SYSTIME in ixgbe_ptp_start_cyclecounter 2022-09-05 10:27:42 +02:00
fs btrfs: check if root is readonly while setting security xattr 2022-09-05 10:27:43 +02:00
include net: Fix a data-race around sysctl_net_busy_poll. 2022-09-05 10:27:42 +02:00
init
ipc
kernel sched/deadline: Fix priority inheritance with multiple scheduling classes 2022-09-05 10:27:39 +02:00
lib ratelimit: Fix data-races in ___ratelimit(). 2022-09-05 10:27:42 +02:00
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net net: Fix a data-race around sysctl_somaxconn. 2022-09-05 10:27:42 +02:00
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tools Revert "selftests/bpf: Fix test_align verifier log patterns" 2022-09-05 10:27:39 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.