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authorTejun Heo <htejun@gmail.com>2008-02-14 02:32:07 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-26 16:42:37 +0100
commitcf3680b90c7842cf91ed857ac4528f4e057da366 (patch)
treef73af36b208fab34620808f0075cc54f51cfdfb0
parentLinux 2.6.25-rc3 (diff)
downloadlinux-cf3680b90c7842cf91ed857ac4528f4e057da366.tar.xz
linux-cf3680b90c7842cf91ed857ac4528f4e057da366.zip
printk: fix possible printk overrun
printk recursion detection prepends message to printk_buf and offsets printk_buf when actual message is printed but it forgets to trim buffer length accordingly. This can result in overrun in extreme cases. Fix it. [ mingo@elte.hu: bug was introduced by me via: commit 32a76006683f7b28ae3cc491da37716e002f198e Author: Ingo Molnar <mingo@elte.hu> Date: Fri Jan 25 21:07:58 2008 +0100 printk: make printk more robust by not allowing recursion ] Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/printk.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index bee36100f110..9adc2a473e6e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -666,7 +666,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
}
/* Emit the output into the temporary buffer */
printed_len += vscnprintf(printk_buf + printed_len,
- sizeof(printk_buf), fmt, args);
+ sizeof(printk_buf) - printed_len, fmt, args);
/*
* Copy the output into log_buf. If the caller didn't provide