diff options
author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2006-11-25 11:09:39 -0800 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-25 13:28:34 -0800 |
commit | 5d48545e5e88ab7a27ba6a5cb1e8fff617754b61 (patch) | |
tree | 2da1a8d8e1ca4088cd91cc080f424b3e25e9423f /mm/swap.c | |
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 'mm/swap.c')
0 files changed, 0 insertions, 0 deletions