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authorLinus Torvalds <torvalds@linux-foundation.org>2010-01-28 22:14:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-29 08:22:01 -0800
commit221af7f87b97431e3ee21ce4b0e77d5411cf1549 (patch)
tree480126aada06d87c09cb62e7c8fa292572438c18 /include
parent64a028a6de08545a2c94f302bc7694bf48aee5b5 (diff)
downloadlinux-linaro-android-221af7f87b97431e3ee21ce4b0e77d5411cf1549.tar.gz
Split 'flush_old_exec' into two functions
'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> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/binfmts.h1
-rw-r--r--include/linux/sched.h2
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index cd4349bdc34..89c6249fc56 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -109,6 +109,7 @@ extern int prepare_binprm(struct linux_binprm *);
extern int __must_check remove_arg_zero(struct linux_binprm *);
extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
extern int flush_old_exec(struct linux_binprm * bprm);
+extern void setup_new_exec(struct linux_binprm * bprm);
extern int suid_dumpable;
#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6f7bba93929..abdfacc5865 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1369,7 +1369,7 @@ struct task_struct {
char comm[TASK_COMM_LEN]; /* executable name excluding path
- access with [gs]et_task_comm (which lock
it with task_lock())
- - initialized normally by flush_old_exec */
+ - initialized normally by setup_new_exec */
/* file system info */
int link_count, total_link_count;
#ifdef CONFIG_SYSVIPC