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kernel/kexec.c: use vscnprintf() instead of vsnprintf() in vmcoreinfo_append_str() 

vsnprintf() may let 'r' larger than sizeof(buf), in this case, if 'r' is
also less than "vmcoreinfo_max_size - vmcoreinfo_size" (left size of
destination buffer), next memcpy() will read the unexpected addresses.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chen Gang 2014-01-27 17:07:13 -08:00 committed by Linus Torvalds
parent 53e0ee9fc5
commit a19428e5c3
1 changed files with 1 additions and 1 deletions
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2
kernel/kexec.c
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@ -1537,7 +1537,7 @@ void vmcoreinfo_append_str(const char *fmt, ...)
size_t r; size_t r;
va_start(args, fmt); va_start(args, fmt);
r = vsnprintf(buf, sizeof(buf), fmt, args); r = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args); va_end(args);
r = min(r, vmcoreinfo_max_size - vmcoreinfo_size); r = min(r, vmcoreinfo_max_size - vmcoreinfo_size);