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List: glibc-cvs
Subject: [glibc] hurd: Stop relying on VM_MAX_ADDRESS
From: Samuel Thibault via Glibc-cvs <glibc-cvs () sourceware ! org>
Date: 2024-03-23 22:16:21
Message-ID: 20240323221621.3D2153858C32 () sourceware ! org
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4648bfbbde5466929d24013478697cbdec847b46
commit 4648bfbbde5466929d24013478697cbdec847b46
Author: Sergey Bugaev <bugaevc@gmail.com>
Date: Sat Mar 23 20:32:43 2024 +0300
hurd: Stop relying on VM_MAX_ADDRESS
We'd like to avoid committing to a specific size of virtual address
space (i.e. the value of VM_AARCH64_T0SZ) on AArch64. While the current
version of GNU Mach still exports VM_MAX_ADDRESS for compatibility, we
should try to avoid relying on it when we can. This piece of logic in
_hurdsig_getenv () doesn't actually care about the size of user-
accessible virtual address space, it just wants to preempt faults on any
addresses starting from the value of the P pointer and above. So, use
(unsigned long int) -1 instead of VM_MAX_ADDRESS.
While at it, change the casts to (unsigned long int) and not just
(long int), since the type of struct hurd_signal_preemptor.{first,last}
is unsigned long int.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-ID: <20240323173301.151066-3-bugaevc@gmail.com>
Diff:
---
hurd/hurdsig.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/hurd/hurdsig.c b/hurd/hurdsig.c
index 882a03471d..8b1928d1a1 100644
--- a/hurd/hurdsig.c
+++ b/hurd/hurdsig.c
@@ -1658,8 +1658,8 @@ _hurdsig_getenv (const char *variable)
while (*ep)
{
const char *p = *ep;
- _hurdsig_fault_preemptor.first = (long int) p;
- _hurdsig_fault_preemptor.last = VM_MAX_ADDRESS;
+ _hurdsig_fault_preemptor.first = (unsigned long int) p;
+ _hurdsig_fault_preemptor.last = (unsigned long int) -1;
if (! strncmp (p, variable, len) && p[len] == '=')
{
size_t valuelen;
@@ -1671,8 +1671,8 @@ _hurdsig_getenv (const char *variable)
memcpy (value, p, valuelen);
break;
}
- _hurdsig_fault_preemptor.first = (long int) ++ep;
- _hurdsig_fault_preemptor.last = (long int) (ep + 1);
+ _hurdsig_fault_preemptor.first = (unsigned long int) ++ep;
+ _hurdsig_fault_preemptor.last = (unsigned long int) (ep + 1);
}
_hurdsig_end_catch_fault ();
return value;
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