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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-07-22 10:39:54 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-07-22 23:47:48 +0200 |
| commit | d181d2da0141371bbc360eaea78719203e165e1c (patch) | |
| tree | 4fe696be8b7938abbfa180a0dcef84e3c9616789 /include | |
| parent | x86/stacktrace: Fix reliable check for empty user task stacks (diff) | |
| download | linux-d181d2da0141371bbc360eaea78719203e165e1c.tar.xz linux-d181d2da0141371bbc360eaea78719203e165e1c.zip | |
x86/dumpstack: Dump user space code correctly again
H.J. reported that post 5.7 a segfault of a user space task does not longer
dump the Code bytes when /proc/sys/debug/exception-trace is enabled. It
prints 'Code: Bad RIP value.' instead.
This was broken by a recent change which made probe_kernel_read() reject
non-kernel addresses.
Update show_opcodes() so it retrieves user space opcodes via
copy_from_user_nmi().
Fixes: 98a23609b103 ("maccess: always use strict semantics for probe_kernel_read")
Reported-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87h7tz306w.fsf@nanos.tec.linutronix.de
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions