linux-kernel - [PATCH mm-unstable 09/17] mm: parisc: Introduce arch_align_mmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241210024119.2488608-10-kaleshsingh@google.com>
Date: Mon,  9 Dec 2024 18:41:11 -0800
From: Kalesh Singh <kaleshsingh@...gle.com>
To: akpm@...ux-foundation.org, vbabka@...e.cz, yang@...amperecomputing.com, 
	riel@...riel.com, david@...hat.com
Cc: linux@...linux.org.uk, tsbogend@...ha.franken.de, 
	James.Bottomley@...senPartnership.com, ysato@...rs.sourceforge.jp, 
	dalias@...c.org, glaubitz@...sik.fu-berlin.de, davem@...emloft.net, 
	andreas@...sler.com, tglx@...utronix.de, bp@...en8.de, 
	dave.hansen@...ux.intel.com, x86@...nel.org, chris@...kel.net, 
	jcmvbkbc@...il.com, bhelgaas@...gle.com, jason.andryuk@....com, 
	leitao@...ian.org, linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-csky@...r.kernel.org, loongarch@...ts.linux.dev, 
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, 
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, linux-mm@...ck.org, 
	kernel-team@...roid.com, android-mm@...gle.com, 
	Kalesh Singh <kaleshsingh@...gle.com>
Subject: [PATCH mm-unstable 09/17] mm: parisc: Introduce arch_align_mmap_hint()

Introduce parisc arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT.
This is a preparatory patch, no functional change is introduced.

Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
---
 arch/parisc/include/asm/pgtable.h |  1 +
 arch/parisc/kernel/sys_parisc.c   | 37 ++++++++++++++++++++-----------
 2 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index babf65751e81..73987357c78e 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -505,6 +505,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#define HAVE_ARCH_MMAP_HINT
 
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index f852fe274abe..8ab05b29c505 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -96,12 +96,32 @@ unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
 
 enum mmap_allocation_direction {UP, DOWN};
 
+unsigned long arch_mmap_hint(struct file *filp, unsigned long addr,
+			     unsigned long len, unsigned long pgoff,
+			     unsigned long flags)
+{
+	unsigned long filp_pgoff = GET_FILP_PGOFF(filp);
+	int do_color_align = 0;
+
+	if (!addr)
+		return 0;
+
+	if (filp || (flags & MAP_SHARED))
+		do_color_align = 1;
+
+	if (do_color_align)
+		addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
+	else
+		addr = PAGE_ALIGN(addr);
+
+	return generic_mmap_hint(filp, addr, len, pgoff, flags);
+}
+
 static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	unsigned long addr, unsigned long len, unsigned long pgoff,
 	unsigned long flags, enum mmap_allocation_direction dir)
 {
 	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma, *prev;
 	unsigned long filp_pgoff;
 	int do_color_align;
 	struct vm_unmapped_area_info info = {
@@ -128,18 +148,9 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 		return addr;
 	}
 
-	if (addr) {
-		if (do_color_align)
-			addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
-		else
-			addr = PAGE_ALIGN(addr);
-
-		vma = find_vma_prev(mm, addr, &prev);
-		if (TASK_SIZE - len >= addr &&
-		    (!vma || addr + len <= vm_start_gap(vma)) &&
-		    (!prev || addr >= vm_end_gap(prev)))
-			return addr;
-	}
+	addr = arch_mmap_hint(filp, addr, len, pgoff, flags);
+	if (addr)
+		return addr;
 
 	info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 	info.align_offset = shared_align_offset(filp_pgoff, pgoff);
-- 
2.47.0.338.g60cca15819-goog