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Mon, 23 Jun 2025 15:00:07 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id uEKeNPdrWWi8cQAAD6G6ig (envelope-from ); Mon, 23 Jun 2025 15:00:07 +0000 From: Vlastimil Babka Date: Mon, 23 Jun 2025 16:59:51 +0200 Subject: [PATCH RFC 2/2] mm, madvise: move prctl_set_vma() to mm/madvise.c Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250623-anon_name_cleanup-v1-2-04c94384046f@suse.cz> References: <20250623-anon_name_cleanup-v1-0-04c94384046f@suse.cz> In-Reply-To: <20250623-anon_name_cleanup-v1-0-04c94384046f@suse.cz> To: Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , David Hildenbrand , Jann Horn , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Colin Cross Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=6289; i=vbabka@suse.cz; h=from:subject:message-id; bh=GgJ5kuwAujTWdPeQXdF9NpyEneY/99+HBlR3VaCg5ms=; b=owEBbQGS/pANAwAIAbvgsHXSRYiaAcsmYgBoWWv1X4uIKLtSIYHzYzzLjhrnC6u70kUE6f2g/ lcYXseHi62JATMEAAEIAB0WIQR7u8hBFZkjSJZITfG74LB10kWImgUCaFlr9QAKCRC74LB10kWI mvEACACVfDRHAB8UmKGXxmGoefFUbulsxeXJ+OuGoIL5echXIcfuJ8Edpbt9B0/E0/H0TsEj8ym CrqxdoEtbjqf0kaGm0aeo/HUMYTta5pPqahyv8ihouVWBJGcq/Ehxrr90O1TuGJslrqGPthoDYl 2vvVgEsaGGKVYhD4ftF+vQMyo3DHvB/ng+1FvECw3WD3E0qH9e40JlDMncR+Too20VsHsqeSL7b WpCdHexp2rLiCB9wLIAcqZV8t8Sqt/6txea4CaVWM0OzRBB3yTYS7B6j4HdFy5wpKRW0AuL0Kiw wLC/J/1VN2RlhBT4Vx+fl8Z031UiGMMGsUNXSDN3vFxi9DPq X-Developer-Key: i=vbabka@suse.cz; a=openpgp; fpr=A940D434992C2E8E99103D50224FA7E7CC82A664 X-Spamd-Result: default: False [-8.30 / 50.00]; REPLY(-4.00)[]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_TWELVE(0.00)[12]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RL7wgbib1ih6q11z93xiyrfhpt)]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.cz:email,suse.cz:mid] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -8.30 Setting anon_name is done via madvise_set_anon_name() and behaves a lot of like other madvise operations. However, apparently because madvise() has lacked the 4th argument and prctl() not, the userspace entry point has been implemented via prctl(PR_SET_VMA, ...) and handled first by prctl_set_vma(). Currently prctl_set_vma() lives in kernel/sys.c but it's mm code so move it under mm. mm/madvise.c seems to be the most straightforward place as that's where madvise_set_anon_name() lives, so we can stop declaring the latter in the header and instead declare prctl_set_vma(). It's not ideal as prctl is not madvise, but that's the reality we live in, as described above. Signed-off-by: Vlastimil Babka --- include/linux/mm.h | 13 +++++------ kernel/sys.c | 64 --------------------------------------------------= ---- mm/madvise.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++-- 3 files changed, 63 insertions(+), 73 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0e0549f3d681f6c7a78e8dfa341a810e5a8f96c1..1f8c2561c8cf77e9bb695094325= 401c09c15f3e6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4059,14 +4059,13 @@ unsigned long wp_shared_mapping_range(struct addres= s_space *mapping, #endif =20 #ifdef CONFIG_ANON_VMA_NAME -int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, - unsigned long len_in, - struct anon_vma_name *anon_name); +int prctl_set_vma(unsigned long opt, unsigned long start, + unsigned long size, unsigned long arg); #else -static inline int -madvise_set_anon_name(struct mm_struct *mm, unsigned long start, - unsigned long len_in, struct anon_vma_name *anon_name) { - return 0; +static inline int prctl_set_vma(unsigned long opt, unsigned long start, + unsigned long size, unsigned long arg) +{ + return -EINVAL; } #endif =20 diff --git a/kernel/sys.c b/kernel/sys.c index adc0de0aa364aebb23999f621717a5d32599921c..247d8925daa6fc8613450404283= 2c2164b5d8277 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2343,70 +2343,6 @@ int __weak arch_lock_shadow_stack_status(struct task= _struct *t, unsigned long st =20 #define PR_IO_FLUSHER (PF_MEMALLOC_NOIO | PF_LOCAL_THROTTLE) =20 -#ifdef CONFIG_ANON_VMA_NAME - -#define ANON_VMA_NAME_MAX_LEN 80 -#define ANON_VMA_NAME_INVALID_CHARS "\\`$[]" - -static inline bool is_valid_name_char(char ch) -{ - /* printable ascii characters, excluding ANON_VMA_NAME_INVALID_CHARS */ - return ch > 0x1f && ch < 0x7f && - !strchr(ANON_VMA_NAME_INVALID_CHARS, ch); -} - -static int prctl_set_vma(unsigned long opt, unsigned long addr, - unsigned long size, unsigned long arg) -{ - struct mm_struct *mm =3D current->mm; - const char __user *uname; - struct anon_vma_name *anon_name =3D NULL; - int error; - - switch (opt) { - case PR_SET_VMA_ANON_NAME: - uname =3D (const char __user *)arg; - if (uname) { - char *name, *pch; - - name =3D strndup_user(uname, ANON_VMA_NAME_MAX_LEN); - if (IS_ERR(name)) - return PTR_ERR(name); - - for (pch =3D name; *pch !=3D '\0'; pch++) { - if (!is_valid_name_char(*pch)) { - kfree(name); - return -EINVAL; - } - } - /* anon_vma has its own copy */ - anon_name =3D anon_vma_name_alloc(name); - kfree(name); - if (!anon_name) - return -ENOMEM; - - } - - mmap_write_lock(mm); - error =3D madvise_set_anon_name(mm, addr, size, anon_name); - mmap_write_unlock(mm); - anon_vma_name_put(anon_name); - break; - default: - error =3D -EINVAL; - } - - return error; -} - -#else /* CONFIG_ANON_VMA_NAME */ -static int prctl_set_vma(unsigned long opt, unsigned long start, - unsigned long size, unsigned long arg) -{ - return -EINVAL; -} -#endif /* CONFIG_ANON_VMA_NAME */ - static inline unsigned long get_current_mdwe(void) { unsigned long ret =3D 0; diff --git a/mm/madvise.c b/mm/madvise.c index ae29395b4fc7f65a449c5772b1901a90f4195885..4a8e61e2c5025726bc2ce1f3237= 68c5b25cef2c9 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -31,6 +31,7 @@ #include #include #include +#include =20 #include =20 @@ -134,8 +135,8 @@ static int replace_anon_vma_name(struct vm_area_struct = *vma, return 0; } =20 -int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, - unsigned long len_in, struct anon_vma_name *anon_name) +static int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, + unsigned long len_in, struct anon_vma_name *anon_name) { unsigned long end; unsigned long len; @@ -165,6 +166,60 @@ int madvise_set_anon_name(struct mm_struct *mm, unsign= ed long start, madv_behavior.range.end =3D end; return madvise_walk_vmas(&madv_behavior); } + +#define ANON_VMA_NAME_MAX_LEN 80 +#define ANON_VMA_NAME_INVALID_CHARS "\\`$[]" + +static inline bool is_valid_name_char(char ch) +{ + /* printable ascii characters, excluding ANON_VMA_NAME_INVALID_CHARS */ + return ch > 0x1f && ch < 0x7f && + !strchr(ANON_VMA_NAME_INVALID_CHARS, ch); +} + +int prctl_set_vma(unsigned long opt, unsigned long addr, + unsigned long size, unsigned long arg) +{ + struct mm_struct *mm =3D current->mm; + const char __user *uname; + struct anon_vma_name *anon_name =3D NULL; + int error; + + switch (opt) { + case PR_SET_VMA_ANON_NAME: + uname =3D (const char __user *)arg; + if (uname) { + char *name, *pch; + + name =3D strndup_user(uname, ANON_VMA_NAME_MAX_LEN); + if (IS_ERR(name)) + return PTR_ERR(name); + + for (pch =3D name; *pch !=3D '\0'; pch++) { + if (!is_valid_name_char(*pch)) { + kfree(name); + return -EINVAL; + } + } + /* anon_vma has its own copy */ + anon_name =3D anon_vma_name_alloc(name); + kfree(name); + if (!anon_name) + return -ENOMEM; + + } + + mmap_write_lock(mm); + error =3D madvise_set_anon_name(mm, addr, size, anon_name); + mmap_write_unlock(mm); + anon_vma_name_put(anon_name); + break; + default: + error =3D -EINVAL; + } + + return error; +} #else /* CONFIG_ANON_VMA_NAME */ static int replace_anon_vma_name(struct vm_area_struct *vma, struct anon_vma_name *anon_name) --=20 2.50.0