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de1c831a78
Some system owners use slab_debug=FPZ (or similar) as a hardening option,
but do not want to be forced into having kernel addresses exposed due
to the implicit "no_hash_pointers" boot param setting.[1]
Introduce the "hash_pointers" boot param, which defaults to "auto"
(the current behavior), but also includes "always" (forcing on hashing
even when "slab_debug=..." is defined), and "never". The existing
"no_hash_pointers" boot param becomes an alias for "hash_pointers=never".
This makes it possible to boot with "slab_debug=FPZ hash_pointers=always".
Link: https://github.com/KSPP/linux/issues/368 [1]
Fixes: 792702911f ("slub: force on no_hash_pointers when slub_debug is enabled")
Co-developed-by: Sergio Perez Gonzalez <sperezglz@gmail.com>
Signed-off-by: Sergio Perez Gonzalez <sperezglz@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Acked-by: Rafael Aquini <raquini@redhat.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://patch.msgid.link/20250415170232.it.467-kees@kernel.org
[kees@kernel.org: Add note about hash_pointers into slab_debug kernel parameter documentation.]
Signed-off-by: Petr Mladek <pmladek@suse.com>
31 lines
1.3 KiB
C
31 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KERNEL_SPRINTF_H_
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#define _LINUX_KERNEL_SPRINTF_H_
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#include <linux/compiler_attributes.h>
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#include <linux/types.h>
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int num_to_str(char *buf, int size, unsigned long long num, unsigned int width);
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__printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
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__printf(2, 0) int vsprintf(char *buf, const char *, va_list);
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__printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...);
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__printf(3, 0) int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
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__printf(3, 4) int scnprintf(char *buf, size_t size, const char *fmt, ...);
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__printf(3, 0) int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
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__printf(2, 3) __malloc char *kasprintf(gfp_t gfp, const char *fmt, ...);
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__printf(2, 0) __malloc char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
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__printf(2, 0) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args);
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__scanf(2, 3) int sscanf(const char *, const char *, ...);
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__scanf(2, 0) int vsscanf(const char *, const char *, va_list);
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/* These are for specific cases, do not use without real need */
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extern bool no_hash_pointers;
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void hash_pointers_finalize(bool slub_debug);
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/* Used for Rust formatting ('%pA') */
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char *rust_fmt_argument(char *buf, char *end, const void *ptr);
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#endif /* _LINUX_KERNEL_SPRINTF_H */
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