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x86 mmap: fix out of bounds shift

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0x3F << MAP_HUGE_SHIFT is too big to fit in signed int,
make it unsigned

Change-Id: I0e476b80ff51a8e141c90da6f985ba18a3438752
This commit is contained in:
Dominique Martinet
2018-07-13 15:43:40 +09:00
committed by Dominique Martinet
parent 3ce7763715
commit eb675818c7
1 changed files with 2 additions and 2 deletions
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4
arch/x86_64/kernel/syscall.c
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@ -1471,7 +1471,7 @@ set_signal(int sig, void *regs0, siginfo_t *info)
SYSCALL_DECLARE(mmap) SYSCALL_DECLARE(mmap)
{ {
const int supported_flags = 0 const unsigned int supported_flags = 0
| MAP_SHARED // 01 | MAP_SHARED // 01
| MAP_PRIVATE // 02 | MAP_PRIVATE // 02
| MAP_FIXED // 10 | MAP_FIXED // 10
@ -1479,7 +1479,7 @@ SYSCALL_DECLARE(mmap)
| MAP_LOCKED // 2000 | MAP_LOCKED // 2000
| MAP_POPULATE // 8000 | MAP_POPULATE // 8000
| MAP_HUGETLB // 00040000 | MAP_HUGETLB // 00040000
| (0x3F << MAP_HUGE_SHIFT) // FC000000 | (0x3FU << MAP_HUGE_SHIFT) // FC000000
; ;
const int ignored_flags = 0 const int ignored_flags = 0
#ifdef USE_NOCACHE_MMAP #ifdef USE_NOCACHE_MMAP