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| author | Andy Lutomirski <luto@kernel.org> | 2018-09-18 16:08:52 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-10-08 10:41:08 +0200 |
| commit | 07e1d88adaaeab247b300926f78cc3f950dbeda3 (patch) | |
| tree | 6b0236b3dd19df1db268f3386bf613aa83c18708 /arch/x86/kernel/process_64.c | |
| parent | edfbeecd92b0c4a648ed96a7e255bfc9a1bc4642 (diff) | |
| download | linux-07e1d88adaaeab247b300926f78cc3f950dbeda3.tar.gz linux-07e1d88adaaeab247b300926f78cc3f950dbeda3.tar.bz2 linux-07e1d88adaaeab247b300926f78cc3f950dbeda3.zip | |
x86/fsgsbase/64: Fix ptrace() to read the FS/GS base accurately
On 64-bit kernels ptrace can read the FS/GS base using the register access
APIs (PTRACE_PEEKUSER, etc.) or PTRACE_ARCH_PRCTL.
Make both of these mechanisms return the actual FS/GS base.
This will improve debuggability by providing the correct information
to ptracer such as GDB.
[ chang: Rebased and revised patch description. ]
[ mingo: Revised the changelog some more. ]
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Markus T Metzger <markus.t.metzger@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1537312139-5580-2-git-send-email-chang.seok.bae@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
0 files changed, 0 insertions, 0 deletions