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| author |   Maciej W. Rozycki <macro@mips.com> | 2017-12-11 22:56:54 +0000 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2017-12-12 19:14:12 +0100 |
| commit | c8c5a3a24d395b14447a9a89d61586a913840a3b (patch) | |
| tree | 9a4c78d6f34dfb9f3ccd58753bcde1fcd80adbb5 /arch/mips | |
| parent | MIPS: Also verify sizeof `elf_fpreg_t' with PTRACE_SETREGSET (diff) | |
| download | linux-dev-c8c5a3a24d395b14447a9a89d61586a913840a3b.tar.xz linux-dev-c8c5a3a24d395b14447a9a89d61586a913840a3b.zip | |
MIPS: Disallow outsized PTRACE_SETREGSET NT_PRFPREG regset accesses
Complement commit c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use
correct core dump register layout") and also reject outsized
PTRACE_SETREGSET requests to the NT_PRFPREG regset, like with the
NT_PRSTATUS regset.
Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Fixes: c23b3d1a5311 ("MIPS: ptrace: Change GP regset to use correct core dump register layout")
Cc: James Hogan <james.hogan@mips.com>
Cc: Paul Burton <Paul.Burton@mips.com>
Cc: Alex Smith <alex@alex-smith.me.uk>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v3.17+
Patchwork: https://patchwork.linux-mips.org/patch/17930/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/ptrace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 256908951a7c..0b23b1ad99e6 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -550,6 +550,9 @@ static int fpr_set(struct task_struct *target, BUG_ON(count % sizeof(elf_fpreg_t)); + if (pos + count > sizeof(elf_fpregset_t)) + return -EIO; + init_fp_ctx(target); if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t)) |