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authorLinus Torvalds <torvalds@linux-foundation.org>2010-01-28 22:14:42 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-02-09 04:50:49 -0800
commit336ca4cc1f9d14edbb5d155b41aa301aaeb731c4 (patch)
tree11584b7cd96b898d9483ebd9322e77685b80af9b /arch
parent944a638b7bb07f3ef9a33af60e5ea8465b7adfd1 (diff)
downloadlinux-linaro-stable-336ca4cc1f9d14edbb5d155b41aa301aaeb731c4.tar.gz
Split 'flush_old_exec' into two functions
commit 221af7f87b97431e3ee21ce4b0e77d5411cf1549 upstream. 'flush_old_exec()' is the point of no return when doing an execve(), and it is pretty badly misnamed. It doesn't just flush the old executable environment, it also starts up the new one. Which is very inconvenient for things like setting up the new personality, because we want the new personality to affect the starting of the new environment, but at the same time we do _not_ want the new personality to take effect if flushing the old one fails. As a result, the x86-64 '32-bit' personality is actually done using this insane "I'm going to change the ABI, but I haven't done it yet" bit (TIF_ABI_PENDING), with SET_PERSONALITY() not actually setting the personality, but just the "pending" bit, so that "flush_thread()" can do the actual personality magic. This patch in no way changes any of that insanity, but it does split the 'flush_old_exec()' function up into a preparatory part that can fail (still called flush_old_exec()), and a new part that will actually set up the new exec environment (setup_new_exec()). All callers are changed to trivially comply with the new world order. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/process_64.c2
-rw-r--r--arch/x86/ia32/ia32_aout.c10
2 files changed, 7 insertions, 5 deletions
diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c
index 1192398ef582..44aa119df783 100644
--- a/arch/sh/kernel/process_64.c
+++ b/arch/sh/kernel/process_64.c
@@ -367,7 +367,7 @@ void exit_thread(void)
void flush_thread(void)
{
- /* Called by fs/exec.c (flush_old_exec) to remove traces of a
+ /* Called by fs/exec.c (setup_new_exec) to remove traces of a
* previously running executable. */
#ifdef CONFIG_SH_FPU
if (last_task_used_math == current) {
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
index 2a4d073d2cf1..435d2a5323da 100644
--- a/arch/x86/ia32/ia32_aout.c
+++ b/arch/x86/ia32/ia32_aout.c
@@ -308,15 +308,17 @@ static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
if (retval)
return retval;
- regs->cs = __USER32_CS;
- regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
- regs->r13 = regs->r14 = regs->r15 = 0;
-
/* OK, This is the point of no return */
set_personality(PER_LINUX);
set_thread_flag(TIF_IA32);
clear_thread_flag(TIF_ABI_PENDING);
+ setup_new_exec(bprm);
+
+ regs->cs = __USER32_CS;
+ regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
+ regs->r13 = regs->r14 = regs->r15 = 0;
+
current->mm->end_code = ex.a_text +
(current->mm->start_code = N_TXTADDR(ex));
current->mm->end_data = ex.a_data +