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Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

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The help text for this config is duplicated across the x86, parisc, and
s390 Kconfig.debug files.  Arnd Bergman noted that the help text was
slightly misleading and should be fixed to state that enabling this
option isn't a problem when using pre 4.4 gcc.

To simplify the rewording, consolidate the text into lib/Kconfig.debug
and modify it there to be more explicit about when you should say N to
this config.

Also, make the text a bit more generic by stating that this option
enables compile time checks so we can cover architectures which emit
warnings vs.  ones which emit errors.  The details of how an
architecture decided to implement the checks isn't as important as the
concept of compile time checking of copy_from_user() calls.

While we're doing this, remove all the copy_from_user_overflow() code
that's duplicated many times and place it into lib/ so that any
architecture supporting this option can get the function for free.

Signed-off-by: Stephen Boyd <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Acked-by: Helge Deller <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Chris Metcalf <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Stephen Boyd 2013-04-30 15:28:42 -07:00 • committed by Linus Torvalds
commit 446f24d119
16 changed files with 31 additions and 76 deletions
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8
arch/tile/Kconfig
View file

@ -19,6 +19,7 @@ config TILE
select HAVE_SYSCALL_WRAPPERS if TILEGX
select VIRT_TO_BUS
select SYS_HYPERVISOR
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
@ -114,13 +115,6 @@ config STRICT_DEVMEM
config SMP
def_bool y
# Allow checking for compile-time determined overflow errors in
# copy_from_user(). There are still unprovable places in the
# generic code as of 2.6.34, so this option is not really compatible
# with -Werror, which is more useful in general.
config DEBUG_COPY_FROM_USER
def_bool n
config HVC_TILE
depends on TTY
select HVC_DRIVER

7
arch/tile/include/asm/uaccess.h
View file

@ -395,7 +395,12 @@ _copy_from_user(void *to, const void __user *from, unsigned long n)
return n;
}
#ifdef CONFIG_DEBUG_COPY_FROM_USER
#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
/*
* There are still unprovable places in the generic code as of 2.6.34, so this
* option is not really compatible with -Werror, which is more useful in
* general.
*/
extern void copy_from_user_overflow(void)
__compiletime_warning("copy_from_user() size is not provably correct");

8
arch/tile/lib/uaccess.c
View file

@ -22,11 +22,3 @@ int __range_ok(unsigned long addr, unsigned long size)
is_arch_mappable_range(addr, size));
}
EXPORT_SYMBOL(__range_ok);
#ifdef CONFIG_DEBUG_COPY_FROM_USER
void copy_from_user_overflow(void)
{
WARN(1, "Buffer overflow detected!\n");
}
EXPORT_SYMBOL(copy_from_user_overflow);
#endif