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| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-09-24 06:24:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-24 13:54:19 -0700 |
| commit | bb9c861ee1b94c97cd98c783a2b4c1cf53ff1712 (patch) | |
| tree | 91052edab9906811181b9701d5a450fb1107cebe | |
| parent | a05c4e1d669d09faa90ce7b22646ad1a4b0de3ff (diff) | |
| download | linux-bb9c861ee1b94c97cd98c783a2b4c1cf53ff1712.tar.bz2 | |
m32r: hole in shifting pc back
It's a userland pointer; worse, an untrustable one since ptrace
has just provided a chance to modify it.
X-Roothole-Covering-Cabal: TINRCC
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/m32r/kernel/signal.c | 38 |
1 files changed, 17 insertions, 21 deletions
diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c index a56fcbd8abe6..7bbe38645ed5 100644 --- a/arch/m32r/kernel/signal.c +++ b/arch/m32r/kernel/signal.c @@ -251,6 +251,19 @@ give_sigsegv: return -EFAULT; } +static int prev_insn(struct pt_regs *regs) +{ + u16 inst; + if (get_user(&inst, (u16 __user *)(regs->bpc - 2))) + return -EFAULT; + if ((inst & 0xfff0) == 0x10f0) /* trap ? */ + regs->bpc -= 2; + else + regs->bpc -= 4; + regs->syscall_nr = -1; + return 0; +} + /* * OK, we're invoking a handler */ @@ -259,8 +272,6 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) { - unsigned short inst; - /* Are we from a system call? */ if (regs->syscall_nr >= 0) { /* If so, check system call restarting.. */ @@ -278,12 +289,8 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, /* fallthrough */ case -ERESTARTNOINTR: regs->r0 = regs->orig_r0; - inst = *(unsigned short *)(regs->bpc - 2); - if ((inst & 0xfff0) == 0x10f0) /* trap ? */ - regs->bpc -= 2; - else - regs->bpc -= 4; - regs->syscall_nr = -1; + if (prev_insn(regs) < 0) + return -EFAULT; } } @@ -310,7 +317,6 @@ static void do_signal(struct pt_regs *regs) siginfo_t info; int signr; struct k_sigaction ka; - unsigned short inst; sigset_t *oldset; /* @@ -353,21 +359,11 @@ static void do_signal(struct pt_regs *regs) regs->r0 == -ERESTARTSYS || regs->r0 == -ERESTARTNOINTR) { regs->r0 = regs->orig_r0; - inst = *(unsigned short *)(regs->bpc - 2); - if ((inst & 0xfff0) == 0x10f0) /* trap ? */ - regs->bpc -= 2; - else - regs->bpc -= 4; - regs->syscall_nr = -1; + prev_insn(regs); } else if (regs->r0 == -ERESTART_RESTARTBLOCK){ regs->r0 = regs->orig_r0; regs->r7 = __NR_restart_syscall; - inst = *(unsigned short *)(regs->bpc - 2); - if ((inst & 0xfff0) == 0x10f0) /* trap ? */ - regs->bpc -= 2; - else - regs->bpc -= 4; - regs->syscall_nr = -1; + prev_insn(regs); } } if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |