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x86-64: syscall-audit: fix 32/64 syscall hole 

On x86-64, a 32-bit process (TIF_IA32) can switch to 64-bit mode with
ljmp, and then use the "syscall" instruction to make a 64-bit system
call.  A 64-bit process make a 32-bit system call with int $0x80.

In both these cases, audit_syscall_entry() will use the wrong system
call number table and the wrong system call argument registers.  This
could be used to circumvent a syscall audit configuration that filters
based on the syscall numbers or argument details.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath 2009-02-27 19:03:24 -08:00 committed by Linus Torvalds
parent 778ef1e6cb
commit ccbe495caa
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/ptrace.c
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@ -1388,7 +1388,7 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
#ifdef CONFIG_X86_32
# define IS_IA32 1
#elif defined CONFIG_IA32_EMULATION
# define IS_IA32 test_thread_flag(TIF_IA32)
# define IS_IA32 is_compat_task()
#else
# define IS_IA32 0
#endif