diff options
| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-11-25 11:09:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-25 13:28:34 -0800 |
| commit | 5d48545e5e88ab7a27ba6a5cb1e8fff617754b61 (patch) | |
| tree | 2da1a8d8e1ca4088cd91cc080f424b3e25e9423f /arch/um/include | |
| parent | 9dce447a542d8b4bedf13d6a4c4fc6737240372e (diff) | |
[PATCH] uml: make execvp safe for our usage
Reimplement execvp for our purposes - after we call fork() it is fundamentally
unsafe to use the kernel allocator - current is not valid there. So we simply
pass to our modified execvp() a preallocated buffer. This fixes a real bug
and works very well in testing (I've seen indirectly warning messages from the
forked thread - they went on the pipe connected to its stdout and where read
as a number by UML, when calling read_output(). I verified the obtained
number corresponded to "BUG:").
The added use of __cant_sleep() is not a new bug since __cant_sleep() is
already used in the same function - passing an atomicity parameter would be
better but it would require huge change, stating that this function must not
be called in atomic context and can sleep is a better idea (will make sure of
this gradually).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/include')
| -rw-r--r-- | arch/um/include/os.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h index 6516f6dca96..13a86bd383d 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -233,6 +233,8 @@ extern unsigned long __do_user_copy(void *to, const void *from, int n, void (*op)(void *to, const void *from, int n), int *faulted_out); +/* execvp.c */ +extern int execvp_noalloc(char *buf, const char *file, char *const argv[]); /* helper.c */ extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv, unsigned long *stack_out); |