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Date: Fri, 06 Jan 2012 08:21:26 -0500 From: Dan Rosenberg <drosenberg@...curity.com> To: liqin.chen@...plusct.com, lennox.wu@...il.com Cc: linux-kernel@...r.kernel.org, security@...nel.org Subject: [PATCH] score: fix off-by-one index into syscall table If the provided system call number is equal to __NR_syscalls, the current check will pass and a function pointer just after the system call table may be called, since sys_call_table is an array with total size __NR_syscalls. Whether or not this is a security bug depends on what the compiler puts immediately after the system call table. It's likely that this won't do anything bad because there is an additional NULL check on the syscall entry, but if there happens to be a non-NULL value immediately after the system call table, this may result in local privilege escalation. Signed-off-by: Dan Rosenberg <drosenberg@...curity.com> Cc: stable@...nel.org Cc: security@...nel.org --- arch/score/kernel/entry.S | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/score/kernel/entry.S b/arch/score/kernel/entry.S index 577abba..83bb960 100644 --- a/arch/score/kernel/entry.S +++ b/arch/score/kernel/entry.S @@ -408,7 +408,7 @@ ENTRY(handle_sys) sw r9, [r0, PT_EPC] cmpi.c r27, __NR_syscalls # check syscall number - bgtu illegal_syscall + bgeu illegal_syscall slli r8, r27, 2 # get syscall routine la r11, sys_call_table -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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