From: Richard Henderson <richard.henderson@linaro.org>
To: Ilya Leoshkevich <iii@linux.ibm.com>,
Richard Purdie <richard.purdie@linuxfoundation.org>,
Michael Tokarev <mjt@tls.msk.ru>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [PULL 05/13] linux-user: Use walk_memory_regions for open_self_maps
Date: Wed, 21 Feb 2024 14:14:45 -1000 [thread overview]
Message-ID: <ffea7a24-86cd-4019-aaf9-11e22e9feacc@linaro.org> (raw)
In-Reply-To: <2no4imvz2zrar5kchz2l3oddqbgpj77jgwcuf7aritkn2ok763@i2mvpcihztho>
On 2/12/24 10:43, Ilya Leoshkevich wrote:
> int main(void)
> {
> shmat(shmget(IPC_PRIVATE, 1836016, IPC_CREAT | 0600), (void *)0x20000804000, 0);
> open("/proc/self/maps", O_RDONLY);
> }
>
> Apparently an mmap() is missing for shmat() when g>h and shmaddr is
> specified. The mismatch between the host's and the guest's view of the
> mapping's tail appears to be causing the SEGV.
Yes, shmat() is handling none of the h != g page size issues;
it is in fact fairly broken.
r~
next prev parent reply other threads:[~2024-02-22 0:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-01 20:42 [PULL 00/13] linux-user patch queue Richard Henderson
2023-09-01 20:42 ` [PULL 01/13] linux-user: Split out cpu/target_proc.h Richard Henderson
2023-09-01 20:42 ` [PULL 02/13] linux-user: Emulate /proc/cpuinfo on aarch64 and arm Richard Henderson
2023-09-01 20:42 ` [PULL 03/13] linux-user: Emulate /proc/cpuinfo for Alpha Richard Henderson
2023-09-01 20:42 ` [PULL 04/13] util/selfmap: Use dev_t and ino_t in MapInfo Richard Henderson
2023-09-01 20:42 ` [PULL 05/13] linux-user: Use walk_memory_regions for open_self_maps Richard Henderson
2024-01-26 13:03 ` Richard Purdie
2024-01-26 13:33 ` Michael Tokarev
2024-01-26 13:52 ` Richard Purdie
2024-02-05 3:05 ` Richard Henderson
2024-02-05 11:11 ` Richard Purdie
2024-02-12 20:43 ` Ilya Leoshkevich
2024-02-22 0:14 ` Richard Henderson [this message]
2023-09-01 20:42 ` [PULL 06/13] linux-user: Adjust brk for load_bias Richard Henderson
2023-09-01 20:42 ` [PULL 07/13] linux-user: Show heap address in /proc/pid/maps Richard Henderson
2023-09-01 20:42 ` [PULL 08/13] linux-user: Emulate the Anonymous: keyword in /proc/self/smaps Richard Henderson
2023-09-01 20:42 ` [PULL 09/13] linux-user: Remove ELF_START_MMAP and image_info.start_mmap Richard Henderson
2023-09-01 20:42 ` [PULL 10/13] linux-user: Move shmat and shmdt implementations to mmap.c Richard Henderson
2023-09-01 20:42 ` [PULL 11/13] linux-user: Use WITH_MMAP_LOCK_GUARD in target_{shmat, shmdt} Richard Henderson
2023-09-01 20:42 ` [PULL 12/13] linux-user: Fix shmdt Richard Henderson
2023-09-01 20:42 ` [PULL 13/13] linux-user: Track shm regions with an interval tree Richard Henderson
2023-09-06 18:24 ` [PULL 00/13] linux-user patch queue Stefan Hajnoczi
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