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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  include/linux/compiler-gcc4.h: Fix build bug - gcc-4.0.2 doesn't understand __builtin_object_size
  x86/alternatives: No need for alternatives-asm.h to re-invent stuff already in asm.h
  x86/alternatives: Check replacementlen <= instrlen at build time
  x86, 64-bit: Set data segments to null after switching to 64-bit mode
  x86: Clean up the loadsegment() macro
  x86: Optimize loadsegment()
  x86: Add missing might_fault() checks to copy_{to,from}_user()
  x86-64: __copy_from_user_inatomic() adjustments
  x86: Remove unused thread_return label from switch_to()
  x86, 64-bit: Fix bstep_iret jump
  x86: Don't use the strict copy checks when branch profiling is in use
  x86, 64-bit: Move K8 B step iret fixup to fault entry asm
  x86: Generate cmpxchg build failures
  x86: Add a Kconfig option to turn the copy_from_user warnings into errors
  x86: Turn the copy_from_user check into an (optional) compile time warning
  x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy
  x86: Use __builtin_object_size() to validate the buffer size for copy_from_user()
This commit is contained in:
Linus Torvalds
2009-12-05 15:32:03 -08:00
parent a77d2e081b 7cff7ce94a
commit ef26b1691d
18 changed files with 321 additions and 354 deletions
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14
arch/x86/lib/copy_user_64.S
View File

@@ -65,7 +65,7 @@
.endm
/* Standard copy_to_user with segment limit checking */
ENTRY(copy_to_user)
ENTRY(_copy_to_user)
CFI_STARTPROC
GET_THREAD_INFO(%rax)
movq %rdi,%rcx
@@ -75,10 +75,10 @@ ENTRY(copy_to_user)
jae bad_to_user
ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string
CFI_ENDPROC
ENDPROC(copy_to_user)
ENDPROC(_copy_to_user)
/* Standard copy_from_user with segment limit checking */
ENTRY(copy_from_user)
ENTRY(_copy_from_user)
CFI_STARTPROC
GET_THREAD_INFO(%rax)
movq %rsi,%rcx
@@ -88,7 +88,7 @@ ENTRY(copy_from_user)
jae bad_from_user
ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string
CFI_ENDPROC
ENDPROC(copy_from_user)
ENDPROC(_copy_from_user)
ENTRY(copy_user_generic)
CFI_STARTPROC
@@ -96,12 +96,6 @@ ENTRY(copy_user_generic)
CFI_ENDPROC
ENDPROC(copy_user_generic)
ENTRY(__copy_from_user_inatomic)
CFI_STARTPROC
ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string
CFI_ENDPROC
ENDPROC(__copy_from_user_inatomic)
.section .fixup,"ax"
/* must zero dest */
ENTRY(bad_from_user)

10
arch/x86/lib/usercopy_32.c
View File

@@ -874,7 +874,7 @@ EXPORT_SYMBOL(copy_to_user);
* data to the requested size using zero bytes.
*/
unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
_copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
@@ -882,4 +882,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
memset(to, 0, n);
return n;
}
EXPORT_SYMBOL(copy_from_user);
EXPORT_SYMBOL(_copy_from_user);
void copy_from_user_overflow(void)
{
WARN(1, "Buffer overflow detected!\n");
}
EXPORT_SYMBOL(copy_from_user_overflow);