linux-kernel - [PATCH 1/12] get_unmapped_area handles MAP

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: <20070412022029.89DECDDF24@ozlabs.org>
Date:	Thu, 12 Apr 2007 12:20:27 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux Memory Management <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/12] get_unmapped_area handles MAP_FIXED on powerpc

Handle MAP_FIXED in powerpc's arch_get_unmapped_area() in all 3
implementations of it.

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

 arch/powerpc/mm/hugetlbpage.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Index: linux-cell/arch/powerpc/mm/hugetlbpage.c
===================================================================
--- linux-cell.orig/arch/powerpc/mm/hugetlbpage.c	2007-03-22 14:52:07.000000000 +1100
+++ linux-cell/arch/powerpc/mm/hugetlbpage.c	2007-03-22 14:57:40.000000000 +1100
@@ -572,6 +572,13 @@ unsigned long arch_get_unmapped_area(str
 	if (len > TASK_SIZE)
 		return -ENOMEM;
 
+	/* handle fixed mapping: prevent overlap with huge pages */
+	if (flags & MAP_FIXED) {
+		if (is_hugepage_only_range(mm, addr, len))
+			return -EINVAL;
+		return addr;
+	}
+
 	if (addr) {
 		addr = PAGE_ALIGN(addr);
 		vma = find_vma(mm, addr);
@@ -647,6 +654,13 @@ arch_get_unmapped_area_topdown(struct fi
 	if (len > TASK_SIZE)
 		return -ENOMEM;
 
+	/* handle fixed mapping: prevent overlap with huge pages */
+	if (flags & MAP_FIXED) {
+		if (is_hugepage_only_range(mm, addr, len))
+			return -EINVAL;
+		return addr;
+	}
+
 	/* dont allow allocations above current base */
 	if (mm->free_area_cache > base)
 		mm->free_area_cache = base;
@@ -829,6 +843,13 @@ unsigned long hugetlb_get_unmapped_area(
 	/* Paranoia, caller should have dealt with this */
 	BUG_ON((addr + len)  < addr);
 
+	/* Handle MAP_FIXED */
+	if (flags & MAP_FIXED) {
+		if (prepare_hugepage_range(addr, len, pgoff))
+			return -EINVAL;
+		return addr;
+	}
+
 	if (test_thread_flag(TIF_32BIT)) {
 		curareas = current->mm->context.low_htlb_areas;
 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/