1 files changed, 62 insertions, 23 deletions

diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 80c1f952ef7..0e8367c5462 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -25,6 +25,7 @@
 #include <linux/fcntl.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
+#include <linux/security.h>
 #include <linux/highmem.h>
 #include <linux/highuid.h>
 #include <linux/personality.h>
@@ -455,8 +456,19 @@ error_kill:
 }
 
 /*****************************************************************************/
+
+#ifndef ELF_BASE_PLATFORM
 /*
- * present useful information to the program
+ * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
+ * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
+ * will be copied to the user stack in the same manner as AT_PLATFORM.
+ */
+#define ELF_BASE_PLATFORM NULL
+#endif
+
+/*
+ * present useful information to the program by shovelling it onto the new
+ * process's stack
  */
 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 				   struct mm_struct *mm,
@@ -466,15 +478,19 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	unsigned long sp, csp, nitems;
 	elf_caddr_t __user *argv, *envp;
 	size_t platform_len = 0, len;
-	char *k_platform;
-	char __user *u_platform, *p;
+	char *k_platform, *k_base_platform;
+	char __user *u_platform, *u_base_platform, *p;
 	long hwcap;
 	int loop;
 	int nr;	/* reset for each csp adjustment */
 
-	/* we're going to shovel a whole load of stuff onto the stack */
 #ifdef CONFIG_MMU
-	sp = bprm->p;
+	/* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
+	 * by the processes running on the same package. One thing we can do is
+	 * to shuffle the initial stack for them, so we give the architecture
+	 * an opportunity to do so here.
+	 */
+	sp = arch_align_stack(bprm->p);
 #else
 	sp = mm->start_stack;
 
@@ -483,11 +499,14 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 		return -EFAULT;
 #endif
 
-	/* get hold of platform and hardware capabilities masks for the machine
-	 * we are running on.  In some cases (Sparc), this info is impossible
-	 * to get, in others (i386) it is merely difficult.
-	 */
 	hwcap = ELF_HWCAP;
+
+	/*
+	 * If this architecture has a platform capability string, copy it
+	 * to userspace.  In some cases (Sparc), this info is impossible
+	 * for userspace to get any other way, in others (i386) it is
+	 * merely difficult.
+	 */
 	k_platform = ELF_PLATFORM;
 	u_platform = NULL;
 
@@ -499,19 +518,20 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 			return -EFAULT;
 	}
 
-#if defined(__i386__) && defined(CONFIG_SMP)
-	/* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
-	 * by the processes running on the same package. One thing we can do is
-	 * to shuffle the initial stack for them.
-	 *
-	 * the conditionals here are unneeded, but kept in to make the code
-	 * behaviour the same as pre change unless we have hyperthreaded
-	 * processors. This keeps Mr Marcelo Person happier but should be
-	 * removed for 2.5
+	/*
+	 * If this architecture has a "base" platform capability
+	 * string, copy it to userspace.
 	 */
-	if (smp_num_siblings > 1)
-		sp = sp - ((current->pid % 64) << 7);
-#endif
+	k_base_platform = ELF_BASE_PLATFORM;
+	u_base_platform = NULL;
+
+	if (k_base_platform) {
+		platform_len = strlen(k_base_platform) + 1;
+		sp -= platform_len;
+		u_base_platform = (char __user *) sp;
+		if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
+			return -EFAULT;
+	}
 
 	sp &= ~7UL;
 
@@ -541,9 +561,13 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	}
 
 	/* force 16 byte _final_ alignment here for generality */
-#define DLINFO_ITEMS 13
+#define DLINFO_ITEMS 15
+
+	nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
+		(k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
 
-	nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
+	if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
+		nitems++;
 
 	csp = sp;
 	sp -= nitems * 2 * sizeof(unsigned long);
@@ -575,6 +599,19 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 			    (elf_addr_t) (unsigned long) u_platform);
 	}
 
+	if (k_base_platform) {
+		nr = 0;
+		csp -= 2 * sizeof(unsigned long);
+		NEW_AUX_ENT(AT_BASE_PLATFORM,
+			    (elf_addr_t) (unsigned long) u_base_platform);
+	}
+
+	if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
+		nr = 0;
+		csp -= 2 * sizeof(unsigned long);
+		NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
+	}
+
 	nr = 0;
 	csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
 	NEW_AUX_ENT(AT_HWCAP,	hwcap);
@@ -590,6 +627,8 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	NEW_AUX_ENT(AT_EUID,	(elf_addr_t) current->euid);
 	NEW_AUX_ENT(AT_GID,	(elf_addr_t) current->gid);
 	NEW_AUX_ENT(AT_EGID,	(elf_addr_t) current->egid);
+	NEW_AUX_ENT(AT_SECURE,	security_bprm_secureexec(bprm));
+	NEW_AUX_ENT(AT_EXECFN,	bprm->exec);
 
 #ifdef ARCH_DLINFO
 	nr = 0;