9f0cf4adb6
gcc (4.x) supports the __builtin_object_size() builtin, which reports the size of an object that a pointer point to, when known at compile time. If the buffer size is not known at compile time, a constant -1 is returned. This patch uses this feature to add a sanity check to copy_from_user(); if the target buffer is known to be smaller than the copy size, the copy is aborted and a WARNing is emitted in memory debug mode. These extra checks compile away when the object size is not known, or if both the buffer size and the copy length are constants. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> LKML-Reference: <20090926143301.2c396b94@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* Exports for assembly files.
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All C exports should go in the respective C files. */
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <net/checksum.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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#include <asm/desc.h>
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#include <asm/ftrace.h>
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#ifdef CONFIG_FUNCTION_TRACER
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/* mcount is defined in assembly */
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EXPORT_SYMBOL(mcount);
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#endif
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EXPORT_SYMBOL(kernel_thread);
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EXPORT_SYMBOL(__get_user_1);
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EXPORT_SYMBOL(__get_user_2);
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EXPORT_SYMBOL(__get_user_4);
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EXPORT_SYMBOL(__get_user_8);
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EXPORT_SYMBOL(__put_user_1);
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EXPORT_SYMBOL(__put_user_2);
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EXPORT_SYMBOL(__put_user_4);
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EXPORT_SYMBOL(__put_user_8);
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EXPORT_SYMBOL(copy_user_generic);
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EXPORT_SYMBOL(__copy_user_nocache);
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EXPORT_SYMBOL(_copy_from_user);
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EXPORT_SYMBOL(copy_to_user);
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EXPORT_SYMBOL(__copy_from_user_inatomic);
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EXPORT_SYMBOL(copy_page);
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EXPORT_SYMBOL(clear_page);
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EXPORT_SYMBOL(csum_partial);
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/*
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* Export string functions. We normally rely on gcc builtin for most of these,
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* but gcc sometimes decides not to inline them.
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*/
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#undef memcpy
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#undef memset
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#undef memmove
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extern void *memset(void *, int, __kernel_size_t);
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extern void *memcpy(void *, const void *, __kernel_size_t);
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extern void *__memcpy(void *, const void *, __kernel_size_t);
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EXPORT_SYMBOL(memset);
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EXPORT_SYMBOL(memcpy);
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EXPORT_SYMBOL(__memcpy);
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EXPORT_SYMBOL(empty_zero_page);
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EXPORT_SYMBOL(init_level4_pgt);
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EXPORT_SYMBOL(load_gs_index);
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