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libbb: add sanity check in bb_arg_max()

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2014-12-24 01:46:29 +01:00
parent 11775edbfc
commit ca9c4653a9
1 changed files with 9 additions and 1 deletions
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10
libbb/sysconf.c
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@ -11,7 +11,15 @@
#if !defined(bb_arg_max) #if !defined(bb_arg_max)
unsigned FAST_FUNC bb_arg_max(void) unsigned FAST_FUNC bb_arg_max(void)
{ {
return sysconf(_SC_ARG_MAX); long r = sysconf(_SC_ARG_MAX);
/* I've seen a version of uclibc which returned -1.
* Guard about it, and also avoid insanely large values
*/
if ((unsigned long)r > 64*1024*1024)
r = 64*1024*1024;
return r;
} }
#endif #endif