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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-10-18 11:13:01 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-10-18 11:13:01 -0300 |
| commit | ce6c9da1113ad681bff27a3e376d2017f7f8a59c (patch) | |
| tree | 922ee99522f8e47e4fa5c735d4ea378dfdb79085 /arch/powerpc/kernel/process.c | |
| parent | d4ae552982de39417d17f823df1f06b1cbc3686c (diff) | |
| parent | 20e8e72d0fa8e26202932c30d592bade73fdc701 (diff) | |
| download | linux-ce6c9da1113ad681bff27a3e376d2017f7f8a59c.tar.bz2 | |
Merge remote-tracking branch 'tip/perf/urgent' into perf/core
To pick up fixes.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 913c5725cdb2..bb6ac471a784 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1306,6 +1306,16 @@ void show_user_instructions(struct pt_regs *regs) pc = regs->nip - (instructions_to_print * 3 / 4 * sizeof(int)); + /* + * Make sure the NIP points at userspace, not kernel text/data or + * elsewhere. + */ + if (!__access_ok(pc, instructions_to_print * sizeof(int), USER_DS)) { + pr_info("%s[%d]: Bad NIP, not dumping instructions.\n", + current->comm, current->pid); + return; + } + pr_info("%s[%d]: code: ", current->comm, current->pid); for (i = 0; i < instructions_to_print; i++) { |