81efcd3300
For security reasons, UML in is_syscall() needs to have access to code in vsyscall-page. The current implementation grants this access by explicitly allowing access to vsyscall in access_ok_skas(). With this change, copy_from_user() may be used to read the code. Ptrace access to vsyscall-page for debugging already was implemented in get_user_pages() by mainline. In i386, copy_from_user can't access vsyscall-page, but returns EFAULT. To make UML behave as i386 does, I changed is_syscall to use access_process_vm(current) to read the code from vsyscall-page. This doesn't hurt security, but simplifies the code and prepares implementation of stub-vmas. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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| .. | ||
| Makefile | ||
| bugs.c | ||
| checksum.S | ||
| delay.c | ||
| fault.c | ||
| ksyms.c | ||
| ldt.c | ||
| ptrace.c | ||
| ptrace_user.c | ||
| sigcontext.c | ||
| signal.c | ||
| stub.S | ||
| stub_segv.c | ||
| sys_call_table.S | ||
| syscalls.c | ||
| sysrq.c | ||
| unmap.c | ||
| user-offsets.c | ||