2825f10b7f
Support O_PATH file descriptors when handling fgetxattr and fsetxattr.
This avoids requiring file read access to pull extended attributes.
This is needed to support O_PATH file descriptors when calling
SELinux's fgetfilecon() call. In particular, this allows the querying
and setting of SELinux file context by using something like the following
code:
int dirfd = open("/path/to/dir", O_DIRECTORY);
int fd = openat(dirfd, "file", O_PATH | O_NOFOLLOW);
char *context;
fgetfilecon(fd, &context);
This change was motivated by a comment in
https://android-review.googlesource.com/#/c/152680/1/toys/posix/ls.c
Change-Id: Ic0cdf9f9dd0e35a63b44a4c4a08400020041eddf
38 lines
802 B
ArmAsm
38 lines
802 B
ArmAsm
/* Generated by gensyscalls.py. Do not edit. */
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#include <private/bionic_asm.h>
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ENTRY(___fgetxattr)
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pushl %ebx
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.cfi_def_cfa_offset 8
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.cfi_rel_offset ebx, 0
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pushl %ecx
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset ecx, 0
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pushl %edx
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset edx, 0
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pushl %esi
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.cfi_adjust_cfa_offset 4
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.cfi_rel_offset esi, 0
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mov 20(%esp), %ebx
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mov 24(%esp), %ecx
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mov 28(%esp), %edx
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mov 32(%esp), %esi
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movl $__NR_fgetxattr, %eax
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int $0x80
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cmpl $-MAX_ERRNO, %eax
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jb 1f
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negl %eax
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pushl %eax
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call __set_errno_internal
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addl $4, %esp
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1:
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popl %esi
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popl %edx
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popl %ecx
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popl %ebx
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ret
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END(___fgetxattr)
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.hidden ___fgetxattr
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