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| author | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-11-28 15:23:52 +1100 |
|---|---|---|
| committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-11-28 15:23:52 +1100 |
| commit | b5a20aa2657063cbf3b47fc700603180de4bb554 (patch) | |
| tree | 9419fb851cda53a7f1fd67a3697bdf8550df19e4 /arch/powerpc/kernel/signal_32.c | |
| parent | cc09c0dc57de7f7d2ed89d480b5653e5f6a32f2c (diff) | |
| parent | ed313489badef16d700f5a3be50e8fd8f8294bc8 (diff) | |
| download | lwn-b5a20aa2657063cbf3b47fc700603180de4bb554.tar.gz lwn-b5a20aa2657063cbf3b47fc700603180de4bb554.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'arch/powerpc/kernel/signal_32.c')
| -rw-r--r-- | arch/powerpc/kernel/signal_32.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index a6a43103655e..b13abf305996 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -941,9 +941,21 @@ long sys_swapcontext(struct ucontext __user *old_ctx, #ifdef CONFIG_PPC64 unsigned long new_msr = 0; - if (new_ctx && - get_user(new_msr, &new_ctx->uc_mcontext.mc_gregs[PT_MSR])) - return -EFAULT; + if (new_ctx) { + struct mcontext __user *mcp; + u32 cmcp; + + /* + * Get pointer to the real mcontext. No need for + * access_ok since we are dealing with compat + * pointers. + */ + if (__get_user(cmcp, &new_ctx->uc_regs)) + return -EFAULT; + mcp = (struct mcontext __user *)(u64)cmcp; + if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) + return -EFAULT; + } /* * Check that the context is not smaller than the original * size (with VMX but without VSX) |