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Fix corner case in Linux stack mappings

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We need to make sure no existing mappings exist between the
MAP_GROWSDOWN page and the guard page, since otherwise it's
not going to be able to grow down thus causing difficult to
troubleshoot failures.
This commit is contained in:
Justine Tunney 2022-10-03 13:43:52 -07:00
parent 6ba3b448f3
commit 3b4fcd8575
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GPG key ID: BE714B4575D6E328
9 changed files with 14 additions and 16 deletions
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6
libc/sysv/consts/ss.h
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@ -3,15 +3,13 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern const size_t SIGSTKSZ;
extern const size_t MINSIGSTKSZ;
extern const int SS_DISABLE;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#define SIGSTKSZ FRAMESIZE
#define MINSIGSTKSZ 32768
#define SIGSTKSZ 32768
#define MINSIGSTKSZ 32768 /* xnu defines the highest minimum */
#define SS_ONSTACK 1
#define SS_DISABLE SS_DISABLE