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author | Dave Hansen <dave.hansen@linux.intel.com> | 2016-06-08 10:25:33 -0700 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-06-14 12:19:24 +0200 |
commit | a4455082dc6f0b5d51a23523f77600e8ede47c79 (patch) | |
tree | 547fa940270ce2a7a4493cfa7a73c609218a81d4 /arch/x86/kernel/signal_compat.c | |
parent | f0702555b16d31d61dc758fac6efb994c3fe3ec6 (diff) | |
download | linux-stable-a4455082dc6f0b5d51a23523f77600e8ede47c79.tar.gz linux-stable-a4455082dc6f0b5d51a23523f77600e8ede47c79.tar.bz2 linux-stable-a4455082dc6f0b5d51a23523f77600e8ede47c79.zip |
x86/signals: Add missing signal_compat code for x86 features
The 32-bit siginfo is a different binary format than the 64-bit
one. So, when running 32-bit binaries on 64-bit kernels, we have
to convert the kernel's 64-bit version to a 32-bit version that
userspace can grok.
We've added a few features to siginfo over the past few years and
neglected to add them to arch/x86/kernel/signal_compat.c:
1. The si_addr_lsb used in SIGBUS's sent for machine checks
2. The upper/lower bounds for MPX SIGSEGV faults
3. The protection key for pkey faults
I caught this with some protection keys unit tests and realized
it affected a few more features.
This was tested only with my protection keys patch that looks
for a proper value in si_pkey. I didn't actually test the machine
check or MPX code.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac@vger.kernel.org
Link: http://lkml.kernel.org/r/20160608172533.F8F05637@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/signal_compat.c')
-rw-r--r-- | arch/x86/kernel/signal_compat.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c index dc3c0b1c816f..5335ad96a290 100644 --- a/arch/x86/kernel/signal_compat.c +++ b/arch/x86/kernel/signal_compat.c @@ -32,6 +32,21 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) &to->_sifields._pad[0]); switch (from->si_code >> 16) { case __SI_FAULT >> 16: + if (from->si_signo == SIGBUS && + (from->si_code == BUS_MCEERR_AR || + from->si_code == BUS_MCEERR_AO)) + put_user_ex(from->si_addr_lsb, &to->si_addr_lsb); + + if (from->si_signo == SIGSEGV) { + if (from->si_code == SEGV_BNDERR) { + compat_uptr_t lower = (unsigned long)&to->si_lower; + compat_uptr_t upper = (unsigned long)&to->si_upper; + put_user_ex(lower, &to->si_lower); + put_user_ex(upper, &to->si_upper); + } + if (from->si_code == SEGV_PKUERR) + put_user_ex(from->si_pkey, &to->si_pkey); + } break; case __SI_SYS >> 16: put_user_ex(from->si_syscall, &to->si_syscall); |