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authorDavid Vrabel <david.vrabel@csr.com>2008-10-20 17:07:19 +0200
committerDavid Vrabel <david.vrabel@csr.com>2008-10-20 17:07:19 +0200
commit61e0e79ee3c609eb34edf2fe023708cba6a79b1f (patch)
tree663deacffd4071120dc9badb70428fe5f124c7b9 /fs/binfmt_elf_fdpic.c
parentuwb: wrong sizeof argument in mac address compare (diff)
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 (diff)
downloadlinux-61e0e79ee3c609eb34edf2fe023708cba6a79b1f.tar.xz
linux-61e0e79ee3c609eb34edf2fe023708cba6a79b1f.zip
Merge branch 'master' into for-upstream
Conflicts: Documentation/ABI/testing/sysfs-bus-usb drivers/Makefile
Diffstat (limited to 'fs/binfmt_elf_fdpic.c')
-rw-r--r--fs/binfmt_elf_fdpic.c85
1 files changed, 62 insertions, 23 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 80c1f952ef78..0e8367c54624 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;