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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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2
libc/sysv/consts.sh
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@ -579,8 +579,6 @@ syscon sicode SYS_USER_DISPATCH 2 -1 -1 -1 -1 -1 # SIGSYS; syscall
# sigaltstack() values
#
# group name GNU/Systemd XNU's Not UNIX! FreeBSD OpenBSD NetBSD The New Technology Commentary
syscon ss SIGSTKSZ 8192 131072 34816 28672 28672 8192 # overlaid with FRAMESIZE; you need to #undef SIGSTKSZ to access this symbol
syscon ss MINSIGSTKSZ 2048 32768 2048 12288 8192 2048 # overlaid with 32768; you need to #undef MINSIGSTKSZ to access this symbol
syscon ss SS_ONSTACK 1 1 1 1 1 1 # unix consensus
syscon ss SS_DISABLE 2 4 4 4 4 2 # bsd consensus

2
libc/sysv/consts/MINSIGSTKSZ.s
View file

@ -1,2 +0,0 @@
.include "o/libc/sysv/consts/syscon.internal.inc"
.syscon ss,MINSIGSTKSZ,2048,32768,2048,12288,8192,2048

2
libc/sysv/consts/SIGSTKSZ.s
View file

@ -1,2 +0,0 @@
.include "o/libc/sysv/consts/syscon.internal.inc"
.syscon ss,SIGSTKSZ,8192,131072,34816,28672,28672,8192

6
libc/sysv/consts/ss.h
View file

@ -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